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Section-G

 

POWERCHART NAME

 G6PD QUANTITATIVE (GLUCOSE-6-PHOSPHATE DEHYDROGENASE)

MERCY TEST NAME

 G6PD QUANTITATIVE*

MERCY LAB CODE

G6PD 

Specimen:  6.0 ml whole blood drawn in yellow top ACD Solution B tube (LAV - EDTA tube acceptable). 
Do not spin down.
Processing: Send refrigerated to Mayo.  Mayo order code  G6PD
Do not transfer blood to other containers. Do not allow specimen to freeze. 
Use bubble wrap to protect specimen, if yellow ACD tube is being sent.
Performed:    1 day.  Test set up at Mayo Monday through Saturday.
Reference value:   Included with the report.
Method:  Kinetic  Spectrophotometry (KS)
CPT Code:   82955

 

POWERCHART NAME

GALECTIN 3 LEVEL

MERCY TEST NAME

GALECTIN-3*         

MERCY LAB CODE

GAL3

Specimen: 

1.0 ml serum from a plain red top tube

Processing: Send FROZEN to Mayo, Mayo  order code GAL3.
Performed:   2-3 days.  Performed Tuesday, Thursday, Sunday
Reference value:  Included with the report.
Method:  Enzyme-linked Immunosorbant Assay (ELISA)
CPT Code:  82777

 

POWERCHART NAME

GABAPENTIN (NEURONTIN) LEVEL

MERCY TEST NAME

GABAPENTIN*          

MERCY LAB CODE

GABP

Specimen: 
  • 1.0 ml serum from plain red top tube. . 
  • Draw immediately before next scheduled dose.
  • Spin within 2 hours of collection.
Processing: Send refrigerated to Mayo.  Ambient or frozen acceptable.  Mayo order code GABA.
Performed:   2-3 days.  Set up Monday thru Friday.
Reference value:  Included with the report.
Method:  High Performance Liquid Chromatography (HPLC)
CPT Code:  80171

 

POWERCHART NAME

GLUTAMIC ACID DECARBOXYLASE AUTOANTIBODIES

MERCY TEST NAME

GAD65 ANTBY*       

MERCY LAB CODE

GAD

Specimen:  1.0 ml serum from plain red top tube or serum SST tube.
Processing: Send refrigerated to Mayo.  Frozen acceptable. Ambient
Performed:   Monday thru Thursday, Sunday; 10 AM
Reference value:  Included with results.
Method:  Radioimmunoassay (RIA)
CPT Code:  86341

 

TEST NAME

GAMMA GLOBULIN

See: IGG Index CSF* 
       Protein Electrophoresis Serum 

 

POWERCHART NAME

GAMMA GLUTAMYL TRANSFERASE (GGT)

MERCY TEST NAME

GAMMA GT

MERCY LAB CODE

GGT

Specimen: 
  • Preferred in house; 0.5 ml lithium heparin plasma from a PST tube.
  • Preferred reference lab: 0.5 ml serum from a SST tube. 
  • Also acceptable: EDTA plasma and serum from a plain red top tube. 
Stability: 8 hours room temperature, 48 hours refrigerated, freeze if >48 hours.
Cause for rejection: Hemolysis.
Performed: Within 8 hours of receipt.  Available stat.
Reference value: 

9-64 UI/L

Method: Enzymatic
CPT Code:  82977

 

TEST NAME

GASTRIC PH

See: PH Body Fluid

 

POWERCHART NAME

GASTRIN LEVEL

MERCY TEST NAME

GASTRIN*

MERCY LAB CODE

GSTR

Patient preparation:   Patient must be fasting.
Specimen:  1 ml serum from a SST or plain red top tube. Minimum 0.5 ml.
Processing:  Send frozen to Mayo.  Mayo order code GAST.
Performed:   3 days.  Test set up Monday through Friday;5 a.m.-12 a.m., Saturday; 6a.m.-6 p.m.
Reference value: Included in report
Method: Automated Chemiluminescent Immunometric Assay.
CPT Code:  82941

 

POWERCHART NAME

GASTROCCULT® BODY FLUID

MERCY TEST NAME

GASTROCCULT® BODY FLD

MERCY LAB CODE

GASO

Specimen:  1 ml body fluid/sputum. Nursing Service is to collect in specimen container with tight fitting lid and send to the Lab for testing.
Comment:  Indicate source in comment field (Nasogastric or specific site) .
Processing:   Testing performed using Gastroccult® blood slides.  DO NOT use Hemoccult® slides as those are for fecal material only.
Performed:  Within 8 hours of receipt.  Available stat.
Reference value:  Negative
Method:   Guaiac paper test
CPT Code: 82271

 

POWERCHART NAME

GC CULTURE

MERCY TEST NAME

GC CUL

MERCY LAB CODE

GC

Order:

A separate order (and separate plate) is necessary for each collection site.  Indicate site when ordering.  This order is mainly for sites other than genital and urine, and for suspected child abuse cases.

Specimen:

Need special Thayer-Martin plate agar available from Microbiology laboratory.

SPECIMEN COLLECTION:
CERVICAL/VAGINAL
: Obtain under direct visualization with a speculum. Lubricants and jellies should be avoided. Speculum may be moistened with warm water. Inoculate onto agar plate according to instructions below.

URETHRAL: Should not be collected until at least 1 hour after urinating. The external discharge may be used to inoculate the media.  If no discharge is present, collect a specimen using a flexible shaft swab.  (Calgiswab or Mini - Tip Culturette).  Insert the swab approximately 2 cm into the urethra and gently rotate before withdrawing.  Inoculate onto agar plate according to instructions below.

ANAL: Collect using a swab. Obtain from the crypts just inside anal ring, or by anoscopy to collect mucopurulent exudate directly. Inoculate onto agar plate according to instructions below.

THROAT/MOUTH: Collect using a swab.  Obtain from the tonsillar regions.  Inoculate onto agar plate according to instructions below.

NASOPHARYNGEAL: Collect using a swab. Obtain from the posterior pharynx. Inoculate onto agar plate according to instructions below.

OCULAR: Collect using a swab.  Any eye drainage present should be swabbed and used for culture.  Inoculate onto the agar plate according to instructions below.

INOCULATION:

Thayer-Martin plates are available from the Microbiology Department. 

  • Keep plate refrigerated until needed.
  • Plate MUST be at room temperature before inoculation.  Neisseria gonorrhoeae is very fastidious and will not survive on cold media.
  • One collection site per plate..
  • Inoculate a Thayer-Martin plate by gently rolling the swab over the agar surface in a zig-zag pattern.  Inoculate one specimen source per plate. 
  • Label the media side (not lid) of the plate with the patient's first and last name, the site and date of collection.
  • Place the plate in the provided Bio-Bag.  Seal the bag.  Crush the CO2 generator.  Leave bag sealed in an upright position (zip lock upright) for at least 30 seconds.
  • After sealing the bag, keep at room temperature or 35° C.  Do not refrigerate or freeze. 

Comment:

  • Beta lactamase testing is done routinely on isolates of Neisseria gonorrhoeae.
  • This order should be used for cases of suspected child abuse, from any source (other than urine).

RL Client Comments:

  • Write GC CULTURE on order form. Indicate the specimen source.
  • Send at Room Temperature. Do NOT refrigerate or freeze.

Performed:

Final report:  2 days

Reference value: 

No Neisseria gonorrhoeae isolated.

Method:

Standard culture techniques.

CPT Code: 

87081

 

POWERCHART NAME

GC PROBE

MERCY TEST NAME

NEISSERIA GONORRHEA SCREEN by DNA PROBE

MERCY LAB CODE

GCGP

Specimen:

Urethral or cervical
A ProbeTec ET collection kit (gender specific) is available from the Microbiology Dept.  This kit contains a cleaning swab, collection swab and transport tube for females and a collection swab and transport tube for males. The transporter must be delivered to Mercy Lab within 6 days of collection and should be transported between 2-27 degrees celcius. The same tranporter can be used for Chlamydia DNA Probe testing.

Urine
15 – 20 mL of freshly voided urine. The patient should not have urinated for at least 1h prior to specimen collection. Store urine refrigerated @ 2-6°C and deliver the urine to Mercy Lab within 7 days of collection. If the urine was stored @ room temperature before delivery, please call the Mercy Microbiology Department for further instructions (Ext. 7494).

Cervical Specimen Collection:

Use the ProbeTec ET collection kit for females. Using the large cleaning swab provided in the kit, remove the excess mucous from the endocervix.  Discard the swab. Insert the smaller Female Endocervical Swab into the cervical canal and rotate vigorously for approximately 30 seconds.  Avoid touching the vaginal walls when withdrawing the specimen.  Place the swab into the transport tube and snap the swab off at the score mark. Tightly cap the tube and label with the patient’s name, date and time of collection. (Swab must be left in the transport tube.)  Transport at 2-27 degrees celsius, within 6 days of collection.

Urethral Specimen Collection (Male):

Use the ProbeTec ET collection kit for males.  Patient should NOT have urinated one hour prior to specimen collection.  Insert a small Dacron swab 2-4 cm into the urethra.  Rotate the swab for 5 seconds and withdraw.  Place the swab in the transport tube and snap the swab off at the score mark. Tightly cap the tube and label with the patient’s name, date and time of collection. (Swab must be left in the transport tube.) Transport at 2-27 degrees celsius, within 6 days of collection.

Urine Collection:

Collect specimen in a sterile, plastic, preservative-free specimen collection cup. Patient should collect the first 15-20 mL (maximum 60 mL) of a voided urine (the first part of stream, not mid-stream). Tightly cap the urine and label with the patient’s name, date and time of collection. Store the urine in the refrigerator (2-6°C) until transport
to Mercy Lab. Transport refrigerated, within 7 days of collection.

Cause for rejection:

  • Transport tubes received without collection swabs inside.
  • Transport tubes that have expired. 
  • Transport tubes received with a swab different from the one provided in the collection kit.
  • Specimen collected from a site other than cervical, male urethral, or urine
  • Transporters received frozen.

Comment: 

In the case of suspected child abuse, culture is the only recommended procedure.  See: GC Culture.

Results are directly dependent on specimen quality.  Inadequate or improperly collected specimens may give false negative results.

RL Client Comments:

  • Mark GC DNA Probe on the order form.
  • Send swab specimens at room temperature or refrigerated to Mercy lab.
  • Send urine specimens refrigerated to Mercy lab.

Processing:

Store at 2-25 degrees celsius

Performed:

Monday, Wednesday, and Friday with an 0800 cutoff.

Reference value:

Negative for Neisseria gonorrheae

Method:

Strand Displacement Amplification (SDA)

CPT Code:   

87591

 

TEST NAME

GC (Neisseria gonorrhoea, Miscellaeous Sites, by Nucleic Acid Amplification)
(OTHER SITES not genital or urine)*

MERCY TEST NAME

MISCELLANEOUS GENERAL LAB

MERCY LAB CODE

CMIS

Specimen:

Swab specimen collected using the APTIMA Collection Vaginal Swab (the APTIMA Unisex Swab can also be used).  Collection kits are available from Mercy lab.

Mayo Approved Sites:

The following sites are approved for GC testing at Mayo Med Labs, ONLY (Mercy Lab is not approved to do testing on these sites

  • Rectal/anal
  • Ocular (corneal/conjunctiva)
  • Oral/throat
  • Pelvic wash,cul-de-sac fluid (this source requires the APTIMA specimen transfer tube T652, available from Mercy lab).
     

NOTE: If provider wants both Chlamydia and GC testing done on a rectal, ocular, oral or pelvic, a separate order will have to be placed for each test.

Comment:

  • In the case of suspected child abuse, culture is the only recommended procedure.  See GC culture.

 RL Client Comments:

  • If ordering the test at your facility, order a CMIS and put in comment the test is for MGRNA and include the source (rectal, ocular, oral).  If you will order using a rquisition, write CMIS on the order form and indicate the testing is for MGRNA and include the source (rectal, ocular, oral).
  • Send the APTIMA transporter refrigerated to Mercy lab.

Cause for rejection:

  • Transport tubes that are received without collection swabs inside.
  • Transport tubes that have expired.
  • Transport tubes received with a swab different from the one provided in the collection kit.
  • Sources other than those listed above.

Processing:

Refrigerate sample after collection and send to Mayo Med Labs refrigerated. Mayo order code MGRNA (N. gonorr, Misc, Amplified RNA)

Performed:

Monday thru Saturday

Reference value:

Included in report.

Method:

Transcription Mediated Amplification (Gen-Probe)

CPT Code:

87591

 

POWERCHART NAME

GENERAL HEALTH PANEL

MERCY TEST NAME

GENERAL HEALTH PANEL

MERCY LAB CODE

GHP

Includes:  CBC with automated differential, Comprehensive Metabolic Panel, TSH
Specimen: 
  • Preferred in house: 2.0 ml lithum heparin plasma from a PST tube plus 1 EDTA tube. 
  • Preferred reference lab: 2.0 ml serum from a SST tube plus 1 EDTA tube.
  • Also acceptable: serum from a plain red top tube.
  • Refrigerate.  Keep tube closed.
Stability:
  • Lithium heparin plasma or serum: 8 hours room temperature, 48 hours refrigerated, freeze if > 48 hours. 
  • EDTA tube: 36 hours room temperature or refrigerated. 
Cause for rejection:

Grossly hemolyzed specimens are not acceptable. EDTA tube must be received at Mercy within 36 hours of collection.

Performed:  Within 8 hours of receipt.
Reference range: See individual test entry.
Method:   See individual test entry.
CPT Code: 80050

 

POWERCHART NAME

GENITAL CULTURE

MERCY TEST NAME

GENITAL LOW CLT

MERCY LAB CODE

GENL

Order: 

Indicate site when ordering. 
This culture will NOT determine the presence of Neisseria gonorrhoeae. For presence of N. gonorrhoeae, see GC culture.

Specimen: 

Vulva, Vagina, Cervix, or Urethra.  Submit in a double Culturette.

Comment:

  • This culture screens for the presence of Group B Beta Streptococcus, Staphylococcus aureus, Gardnerella vaginalis, and a predominance of yeast.
  • Susceptibility testing will routinely be performed on significant isolates of Staphylococcus aureus.

RL Comments:

Write Genital Tract Lower Culture on RL order form. Indicate Collection site. Send specimen at Room temp.

Performed:

Gram Stain:  1st shift
Final report:  2 days

Reference value:

Normal flora of the lower genital tract.

Method:

Standard culture techniques.

CPT Code:

87070 Culture
87205 Stain

 

POWERCHART NAME

GENTAMICIN LEVEL

MERCY TEST NAME

GENTAMICIN INT

MERCY LAB CODE

GNI

Specimen: 
  • Preferred in house: 0.5 ml lithium heparin plasma from a PST tube. 
  • Preferred reference lab: 0.5 ml serum from a SST tube.
  • Also acceptable: Sodium heparin plasma, EDTA plasma, and serum from a plain red top tube. 
Stability: 8 hours room temperature, 48 hours refrigerated, freeze if  >48 hours.
Cause for rejection:  Specimen must not be hemolyzed, lipemic or icteric. 
Comment:  Indicate time last dose in comment.  Consult Pharmacy to establish collection time.
Performed:  Within 8 hours of receipt.
Therapeutic values:  2-7 mcg/ml
Method:  Emit Enzyme Immunoassay
CPT Code:  80170

 

POWERCHART NAME

GENTAMICIN PEAK LEVEL

MERCY TEST NAME

GENTAMICIN PEAK

MERCY LAB CODE

GNPK

Specimen:    
  • Preferred in house: 0.5 ml lithium heparin plasma from a PST tube.
  • Preferred reference lab: 0.5 ml serum from a SST tube. 
  • Also acceptable: Sodium heparin plasma,  EDTA plasma, and serum from a plain red top tube.
Stability: 8 hours room temperature, 48 hours refrigerated, freeze if >48 hours.
Cause for rejection: Specimen must not be hemolyzed, lipemic or icteric. 
Comment:  Indicate time last dose in comment.  Consult Pharmacy to establish collection time.
Performed: Within 8 hours of receipt.
Therapeutic range:  5-10 mcg/ml
Method: Emit Enzyme Immunoassay
CPT Code:  80170

 

POWERCHART NAME

GENTAMICIN TROUGH LEVEL

MERCY TEST NAME

GENTAMICIN TRGH

MERCY LAB CODE

GNTR

Specimen: 
  • Preferred in house:0.5 ml lithium heparin plasma from a PST tube.
  • Preferred reference lab: 0.5 ml serum from a SST tube. 
  • Also acceptable: Sodium heparin plasma,  EDTA plasma, and serum from a plain red top tube. 
Stability: 8 hours room temperature, 48 hours refrigerated, freeze if >48 hours.
Cause for rejection:  Specimen must not be hemolyzed, lipemic or icteric. 
Comment:  Indicate time last dose in comment.  Consult Pharmacy to establish collection time.
Performed: Within 8 hours of receipt.
Therapeutic range:  1-2 mcg/ml
Method:   Emit Enzyme Immunoassay
CPT Code: 80170
CPT Code: NA

 

POWERCHART NAME

eGFR  estimated Glomerular Filtration Rate

MERCY TEST NAME

eGFR  estimated Glomerular Filtration Rate

MERCY LAB CODE

 

Comment: eGFR is a calculation and not orderable by itself.  eGFR is reported with every creatinine test ordered.
Reference value:

The Laboratory is using the MDRD (Modification of Diet in Renal Disease) equation to calculate the eGFR.  The MDRD equation was evaluated with multiple variables to develop a way to predict renal function.  The formula was devised and measured against the inulin clearance.

eGFR = 175 x (creatinine)-1.154  x (age)-0.203 x (0.742 if female) x (1.21 if African American)

 The MDRD calculated eGFR is not reported if the eGFR is >60 ml/min/1.73M2 or if the patient age is

 Classification of Chronic Kidney Disease (From the National Kidney Foundation)

 

Stage

Description

eGFR

At increased

Risk

Risk factors for kidney disease (e.g., diabetes, high blood

Pressure, family history, older age, ethnic group

>90

1

Kidney damage (protein in urine) with normal or ­ eGFR

>90

2

Kidney damage with mild decrease in eGFR

60-89

3

Moderate decrease in eGFR

30-59

4

Severe decrease in eGFR

15-29

5

Kidney failure

<15

Method:  Calculation
CPT Code:  NA

 

TEST NAME

GHB

See:  Hemoglobin  A1C

 

TEST NAME

GIARDIA ANTIGEN ASSAY, RAPID

See: Giarda/Cryp Rapid

 

POWERCHART NAME

GIARDIA + CRYPTOSPORIDIUM ANTIGEN

MERCY TEST NAME

GIARDIA/CRYP RAPID

MERCY LAB CODE

GLCP

Specimen: 

2 grams feces.  Collect sample in a container with a tight fitting lid.  Deliver to the laboratory immediately after collection.

Cause for rejection:

  • Specimens collected within 7 days of barium or bismuth enema are not acceptable. 
  • Specimens should not be contaminated with toilet water or urine.

Comment:

Detects Giardia and Cryptosporidium antigens.  Tests are not available separately.

RL Comments:

  • 2 grams fresh feces. Collect sample in a container with a tight fitting lid. Refrigerate and deliver to Mercy lab within 24 hours of collection. (Testing needs to take place within 48 hours of collection).
  • If specimens cannot be delivered within 24 hours of collection, preserve specimen in a Cary Blair transporter (orange lid). Ecofix is not acceptable. If using a transporter, add specimen to bring liquid up to line on vial. Cap tightly and mix well. Transport refrigerated.
  • Mark GIARDIA/CRYP RAPID STOOL on the order form.

Performed:

Daily 1500 cutoff.
*Not more than one specimen in 24 hr period.

Method:  

Rapid immunoassay.   

Reference value: 

Not detected.

CPT Code:

87328  Cryptosporidium
87329  Giardia

 

TEST NAME

GLIADIN Deamidated Ab IgA and IgG

See:   TISSUE TRANSGLUTAMINASE ANTIBODIES, IgA and IgG

 

TEST NAME

GLOBULIN SERUM

Cannot be ordered separately.
This is a non-orderable calculated test.

Order Total Protein, Albumin, AG Ratio.

 

POWERCHART NAME

GLOMERULAR BASEMENT MEMBRANE ANTIBODY IgG AB

MERCY TEST NAME

G BASE MEMBRAN IGG*

MERCY LAB CODE

GBM

Specimen:   0.5 mL serum from SST tube or plain red top tube.  Minimum 0.35 ml.
Cause for Rejection:  Hemolysis, Lipemia
Processing:   Send refrigerated to Mayo.  Frozen acceptable.  Mayo order code GBM.
Performed: Monday – Friday, Sunday;11a.m.
Method:  Multiplex flow immunoassay
CPT Code:  83520

 

POWERCHART NAME

GLUCOSE LEVEL

MERCY TEST NAME

GLUCOSE            

MERCY LAB CODE

GLUC

Specimen:
  • Preferred in house: 0.5 ml lithium heparin plasma from a PST tube. 
  • Preferred reference lab: 0.5 ml  serum from SST tube.
  • Also acceptable: Sodium heparin, Amm Heparin, NAFl, EDTA plasma, and serum from a plain red top tube.
Stability: 8 hours room temperature, 48 hours refrigerated, freeze if >48 hours.
Performed:  Within 8 hours of receipt.  Available stat.
Reference value:

0-1 day:                40-60 mg/dl
2 days-11 months: 60-100 mg/dl
1 year-6 years:      70-130 mg/dl
>6 years:              70-110 mg/dl

Method: Hexokinase-UV/NAD
CPT Code:  82947

  

POWERCHART NAME

GLUCOSE BODY FLUID

MERCY TEST NAME

GLUCOSE BF

MERCY LAB CODE

FGLU

Specimen:  1 ml body fluid in plain red top tube
Comment:  Indicate specimen source in comment.
Performed: Within 8 hours of receipt.  Available stat.
Method: Hexokinase-UV/NAD
CPT Code: 82945

 

POWERCHART NAME

GLUCOSE CSF

MERCY TEST NAME

GLUCOSE CSF

MERCY LAB CODE

CGLU

Specimen: 0.5 ml spinal fluid. Hemolyzed specimens should not be used.
Processing:   Freeze specimens if not analyzed immediately.
Comment: Specimen must be transported in a screw top container.
Performed:  Within 8 hours of receipt.  Available stat
Reference value: 

1-13 days: 40-60 mg/dl
>13 days:  40-70 mg/dl

Method: Hexokinase-UV/NAD
CPT Code:   82945

 

POWERCHART NAME

GLUCOSE TOLERANCE GESTATIONAL

MERCY TEST NAME

GLUCOSE GEST

MERCY LAB CODE

GLUG

Patient preparation:

Perform between 24 and 28 weeks gestation on all pregnant women not identified as having glucose intolerance. Screening is performed without regard to the time of day or last meal. 

Specimen:
  • Preferred in house:  0.5 ml lithium heparin plasma from a PST tube. 
  • Preferred reference lab: 0.5 ml serum from a SST tube.
  • Also acceptable: Sodium heparin, Amm heparin, NaFl, EDTA plasma, or serum from a  plain red top tube. 
  • Collect specimen 60 minutes after the administration of 50 G glucose. A venous specimen is preferred.

Reference Lab Clients: Glucose tolerance beverages (50 g) will be provided to outside clients for a nominal fee. Beverages will be delivered by courier.  Please indicate on the order the dose (50 g) and time it was given.

Stability: 8 hours room temperature, 48 hours refrigerated, freeze if >48 hours.
Comment:

Test available:
Out Patient Drawing/Core Lab – Monday-Friday 0800-1730
Core Lab – Saturday and Sunday 0800 - -1200

Performed:  Within 8 hours of receipt.
Reference value: 90-135 mg/dl
Method: Hexokinase-UV/NAD
CPT Code:  82950

 

TEST NAME

GLUCOSE POSTPRANDIAL

See: Glucose Tolerance 2 Hour

Comment:

The postprandial glucose is not recommended because of several variables that are difficult to control and adjust for.

 

POWERCHART NAME

GLUCOSE TOLERANCE 2 HOUR
GLUCOSE TOLERANCE 3 HOUR

MERCY TEST NAME

GLUC TOL 2HR
GLUC TOL 3HR

MERCY LAB CODE

GTT2
GTT3

Comment:

Test available Monday through Saturday, 0645 - 1200.
Call Lab for special ordering instructions if 1/2 hour collections are necessary.

Patient preparation:
  1. Patient should have a regular diet with adequate carbohydrates for three days before test.
    Excessive amounts of sugars should be avoided.  Reducing diets are not satisfactory.
  2. Patient should maintain normal activities with no excessive vigorous exercise.
  3. Patient should not be acutely ill.  Test should not be performed during acute medical or surgical stress and not for several months after an acute myocardial infarction.
  4. Patient should be fasting for at least 8 hours.  Moderate amounts of water are permissible.
  5. Discontinue medications as directed by physician.
  6. Patient should remain seated and should not smoke throughout the test.
  7. No other tests or procedures should be scheduled during a Glucose Tolerance Test. 
    Outpatients having tolerance testing in the Laboratory should be prepared to stay in the Laboratory waiting area for the duration of the test.

Pediatric patients: The amount of glucose given to pediatric patients is by weight for patients 25-95 lbs. See table below for amounts

     Weight in lbs.         oz. Glucose solution          oz. to grams      
             25                   2.6            19.5     
             30                    3.2            24.0
             35                   3.7            27.8
             40                   4.2            31.5
             45                   4.8            36.0
             50                   5.3            39.8
             55                   5.8            43.5
             60                   6.4             48.0
             65                   6.9             51.8
             70                   7.4             55.5
             75                   7.9             59.3
             80                   8.5             63.8
             85                   9.0             67.5
             90                   9.5             71.3
             95                  10.0             75.0

 

 

 

 

 

 

 

 

 

                                                                                                                                                                                               Reference Lab Clients: Glucose tolerance beverages (100 g for pregnant patients, or 75 g for non-pregnant and male patients) will be provided to outside clients for a nominal fee.  Beverages will be delivered by courier.  Please indicate on the order the dose (100g or 75 g) and time it was given.

 

Specimen: 
  • Preferred in house:  0.5 ml lithium heperim plasma from a PST tube. 
  • Preferred reference lab: 0.5 ml serum from a SST tube.
  • Also acceptable: Sodium heparin, Amm heparin, NaFl, EDTA plasma, or serum from a plain red top tube. 
  • Same type collection tube (SST,PST, gray) must be used during the entire test.
Stability: 8 hours room temperature, 48 hours refrigerated, freeze if >48 hours.
Processing: 
  • The Laboratory will collect and run a fasting specimen before administration of the glucose solution (consult procedure for dosage of glucose solution).
  • If the fasting glucose level is 135 mg/dl or less, the Glucose Drink will be given to the patient. 
  • If the fasting level is >/=136 mg/dl, the Glucose Tolerance Test will be canceled and the provider's office will be notified.
Performed: Monday through Saturday 1200 cutoff
Normal range: 

Non-pregnant Men and Women
Fasting:  70-110 mg/dl
1 hour:    120-170 mg/dl
2 hour:    70-120 mg/dl
3 hour:    70-115 mg/dl

Pregnancy Normal Ranges
Fasting:  70-110 mg/dl 
1 hour:    Less than 180 mg/dl
2 hour:    Less than 155 mg/dl
3 hour:    Less than 140 mg/dl

Method: Hexokinase-UV/NAD
CPT Code: 

Gluc Tol 2HR: 82951
Gluc Tol 3HR: 82951 Gluc Tol 2 Hour+
                           82952 Gluc Tol Add Sp+

 

POWERCHART NAME

GLUCOSE 24 HR Urine

MERCY TEST NAME

GLUCOSE 24HR UR

MERCY LAB CODE

VGLU

Specimen:

 5 ml urine from a 24 hour collection.

No preservative needed.

Refrigerate during collection.

Processing:  Indicate 24 hour volume.  Refrigerate.
Performed: Within 8 hours of receipt.  Available stat.
Method: Hexokinase-UV/NAD
CPT Code: 82945

 

POWERCHART NAME

GLUCOSE Random Urine

MERCY TEST NAME

Misc General Lab

MERCY LAB CODE

CMIS

Specimen:

 5 ml urine from a random urine collection.  Refrigerate.

Comment: Indicate test name GLUCOSE RANDOM URINE in comment.
Processing:  Refrigerate.
Performed: Within 8 hours of receipt.  Available stat.
Method: Hexokinase-UV/NAD
CPT Code: 82945

   

TEST NAME

GLYCOHEMOGLOBIN

See:  Hemoglobin A1C

 

TEST NAME

GLYCOSYLATED HEMOGLOBIN

See: Hemoglobin A1C

 

POWERCHART NAME

GRAM STAIN

MERCY TEST NAME

GRAM STAIN DIRECT 

MERCY LAB CODE

GRAM

Order:  

Specify site when ordering. 
A gram stain is already included in a Body Fluid Culture, Respiratory Culture, Wound Culture and an Anaerobic Culture.

Specimen:

  • Fluid specimens: Submit in a sterile screw top container.
  • Other specimens:  Submit in a sterile plastic container with a tight fitting lid or submit on a routine culturette.
  • Any source can be submitted for a gram stain.

Comment:

  • This test is used as the screening test for yeast in vaginal specimens when specifically noted on the order.
     
  • This test is used as the screening test for Gardnerella vaginalis.

RL Comment:

  • Write Gram Stain on RL order form. Indicate source/site.
  • Send specimen at Room Temp

Performed: 

Within 8 hours of receipt.

RL: Next day, 1st shift unless ordered STAT with a specific phone number indicated

Reference value:   

Varies by site of collection.

Method:

Direct microscopy of stained slide.

CPT Code:  

87205

 

TEST NAME

GROUP A STREP SCREEN (THROAT)

See:  Strep Screen Group A (Throat)

 

POWERCHART NAME

GROUP B STREP CULTURE

MERCY TEST NAME

GRP B STREP CLT

MERCY LAB CODE

GBOB

Order:

Place only 1 order for both culturettes (sites).  Specify the source(s) when ordering (i.e.: vag-rect). 

Specimen:  

Both vaginal and rectal specimens are recommended.
Preferred Specimen: Separate culturette from each site, labeled with specimen source. One double culturette with rectal/vag swab is acceptable.

Comment: 

  • Culture screens for Group B Streptococcus only and is recommended for screening obstetric patients for carrier status.
  • MIC testing is not routinely performed.  Please contact the Microbiology lab if patient is at high risk for anaphlaxis due to penicillin allergy and MIC testing is needed. MIC testing is referred to Mayo Med Labs.

RL Comments:

  • Mark GROUP B STREP CULTURE (OBSTETRICS) on RL order form. Only 1 order is needed for both specimens. Write collection site(s) on source line.
  • Send specimen at room temp.

Performed:

Preliminary report:  1 day
Final report:  2 days

Reference value:

No Group B Streptococcus isolated.

Method:

Standard culture techniques.

CPT Code: 

87081

 

POWERCHART NAME

GROWTH HORMONE (HGH) LEVEL

MERCY TEST NAME

GROWTH HORMONE*

MERCY LAB CODE

GRTH

Patient preparation:  Patient must be fasting. (Overnight – 8 hours)
Specimen:  0.6 ml serum from a SST or plain red top tube. Minimum 0.5 ml.
Processing: Send refrigerated to Mayo.  Frozen acceptable. Mayo order code HGH.
Performed: 1- 3 days.  Monday through Friday 5 a.m. - 12 a.m., Saturday 6 a.m.- 6 p.m.
Reference value:   Included in report.
Method:  Immunoenzymatic immunoassay
CPT Code: 83003

 

TEST NAME

GUAIAC TEST

See:  Hemoccult®

 

TEST NAME

GUTTER WASHINGS CYTOLOGY

See: Cytology Section Peritoneal Fluid

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