POWERCHART NAME

GABAPENTIN (NEURONTIN) LEVEL

MERCY TEST NAME

GABAPENTIN          

MERCY LAB CODE

GABP

Specimen: 

0.5 ml serum in a plain red top tube or EDTA plasma (no gel).  Draw 1 hour before next dose.
Pediatric volume: 0.2 ml.  Indicate if specimen is serum or plasma.
Processing: Send refrigerated to Mayo #80826.
Performed:   1 day.  Set up Monday thru Friday at Mayo.
Reference value: 

2.0 - 12.0 mcg/ml.
A significant decline in therapeutic efficacy may occur at concentrations <2.0 mcg/ml.
Method:  High Performance Liquid Chromatography (HPLC)
CPT Code:  82491

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

GGTT

Specimen:  0.5 ml lithium heparin plasma from a PST tube. Sodium heparin plasma also accepted.  Stable 48 hours refrigerated.
Cause for rejection: Hemolysis.
Performed: Within 8 hours of receipt.  Available stat.
Reference value: 

Male: 7 - 50 IU/L
Female: 7 - 50 IU/L
Method: G-Glutamyl-P-Nitroanilide
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:  2 ml serum from a SST or plain red top tube.. 
Processing:  Send frozen to Mayo.  Mayo # 8512.
Performed:   2 days.  Test set up Monday through Friday.
Reference value: <100 pg/ml
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

TEST NAME

GC CULTURE

See: Microbiology Section

In Pt Micro  / Regional Pt Micro

TEST NAME

GC DNA PROBE

See: Microbiology Section

In Pt Micro  / Regional Pt Micro

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:  2.0 ml lithum heparin plasma from a PST tube plus 1 EDTA tube.  Refrigerate.
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

TEST NAME

GENITAL TRACT (LOWER) CULTURE

See: Microbiology Section

In Pt Micro  / Regional Pt Micro

POWERCHART NAME

GENTAMICIN LEVEL

MERCY TEST NAME

GENTAMICIN INT

MERCY LAB CODE

GNI
Specimen:  0.5 ml lithium heparin plasma from a PST tube.  Sodium beparin and EDTA plasma tubes are also acceptable. Stable 48 hours refrigerated.
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:  No intermediate values established.
Method:  Immunoturbidimetric
CPT Code:  80170

POWERCHART NAME

GENTAMICIN PEAK LEVEL

MERCY TEST NAME

GENTAMICIN PEAK

MERCY LAB CODE

GNPK
Specimen:     0.5 ml lithium heparin plasma from a PST tube. Sodium neparin and EDTA plasma tubes also acceptable. Stable 48 hours refrigerated.
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: Immunoturbidimetric
CPT Code:  80170

POWERCHART NAME

GENTAMICIN TROUGH LEVEL

MERCY TEST NAME

GENTAMICIN TRGH

MERCY LAB CODE

GNTR

Specimen:  0.5 ml lithium heparin plasma from a PST tube. Sodium heparin and EDTA plasma tubes are also acceptable.   Stable 48 hours refrigerated.  
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:   Immunoturbidimetric
CPT Code: 80170

TEST NAME

GGPT or GGT

See:  Gamma GT

TEST NAME

GHB

See:  Hemoglobin  A1C

TEST NAME

GIARDIA

See: Microbiology Section

In Pt Micro  / Regional Pt Micro

POWERCHART NAME

GLIADIN Deamidated Ab IgA and IgG

MERCY TEST NAME

GLIADIN Deamidated

MERCY LAB CODE

GLIAD
Specimen: 0.5 ml serum from SST. 
Processing:  Send 1.0 ml serum refrigerated to Mayo, #89031.  Diamidated Gliadin Antibodies Evaluation, IgG and IgG, serum
Performed:  Monday - Friday 9 a.m. and 4 p.m.  Sunday 12 p.m.
Reference range:

Reference ranges included with results
Method:   Enzyme-Linked Immunosorbent Assay (ELISA)
CPT Code:  83516 X2

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.
Cause for Rejection:  Hemolysis, Lipemia
Processing:   Refrigerate
Performed: Monday – Saturday
Method:  Enzyme Immunoassay (EIA)
CPT Code:  83520

POWERCHART NAME

GLUCOSE LEVEL

MERCY TEST NAME

GLUCOSE            

MERCY LAB CODE

GLUC
Specimen:

0.5 ml lithium heparin plasma from a PST tube.  For stat orders:  0.2 ml whole blood from green top tube.
Performed:  Within 8 hours of receipt.  Available stat.
Reference value:

0 - 1 day: 40 - 60 mg/dl
2 days - 11 months: 70 - 130 mg/dl
1 year - 6 years: 60 - 100 mg/dl
> 6 years: 70 - 110 mg/dl
Method: Glucose Oxidase, Oxygen Consumption
CPT Code:  82947

POWERCHART NAME

G6PD QUANTITATIVE (GLUCOSE-6-PHOSPHATE DEHYDROGENASE)

MERCY TEST NAME

G6PD QUANTITATIVE*

MERCY LAB CODE

G6PD
Specimen:

4.0 ml whole blood drawn in yellow top ACD Solution B tube.  Do not spin down.
Processing: Send refrigerated to Mayo, #8368.  DO NOT ALLOW TO FREEZE.  Use bubble wrap to protect specimen
Preformed: 1 day.  Test set up at Mayo Monday through Saturday.
Reference value:

8.6 - 18.6 IU/g Hb
Method: Spectrophotometric Kinetic.
CPT Code: 82955

                  

POWERCHART NAME

GLUCOSE 24 HOUR URINE

MERCY TEST NAME

GLUCOSE 24UR

MERCY LAB CODE

VGLU

Specimen:  24‑hour urine specimen.  Refrigerate during collection, no preservative.
Processing:  Aliquot 10 ml and indicate total 24-hour volume.  Send refrigerated.
Performed: Within 8 hours of receipt.
Reference value: 0 - 0.25 g/24 Hours
Method:  Glucose Oxidase, Oxygen Consumption
CPT Code: 82945

POWERCHART NAME

GLUCOSE BODY FLUID

MERCY TEST NAME

GLUCOSE BF

MERCY LAB CODE

FGLU
Specimen:  1 ml body fluid in gray top tube or plain red top tube
Comment:  Indicate specimen source in comment.
Performed: Within 8 hours of receipt.  Available stat.
Method: Glucose Oxidase, Oxygen Consumption
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: Glucose Oxidase, Oxygen Consumption
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. 
NOTE: Orders for fasting glucose must be drawn before administration of 50 grams glucose and ordered as GLUCOSE. Label each tube appropriately as “Fasting Glucose” or “Gestational Glucose”.
Specimen:

0.5 ml serum from SST or gray top tube.  Collect specimen 60 minutes after the administration of 50 G glucose. A venous specimen must be collected.

Reference Lab Clients: Glucose tolerance beverages (50 G) will be provided to outside clients for a nominal fee. Beverages will be delivered by courier.
Comment:

Test available:
Forest Park Lab – Monday - ‑Friday 0800‑ - 1530
 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: Glucose Oxidase, Oxygen Consumption
CPT Code:  82950

TEST NAME

GLUCOSE POSTPRANDIAL

See: Glucose Tolerance 2 Hour
Comment:

The postprandial glucose is not recommended because of several variable 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, 0700‑ - 1100.
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 8-16 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.

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.
Specimen: 

0.5 ml plasma from a gray top tube or serum from a SST. Same type collection tube (SST, gray) must be used during the entire test.
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 between 126-134 mg/dl, the ordering provider will be notified to ask if they want the Glucose Tolerance Test continued prior to administering the glucose drink to the patient. If the fasting level is >/=135 mg/dl, the Glucose Tolerance Test will be canceled and the provider's office will be notified.
Performed: Monday through Saturday 1100 cutoff
Normal range: 

Non-pregnant:
Fasting: 70 - 110 mg/dl
1 hour: 120 - 170 mg/dl
2 hour: 70 - 120 mg/dl

Pregnancy normal ranges: 
Fasting GTT: < 95 mg/dl
1 hour GTT: <180 mg/dl
2 hour GTT: <155 mg/dl
3 hour GTT: <140 mg/dl
Method: Glucose Oxidase, Oxygen Consumption
CPT Code: 

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

TEST NAME

GLYCOHEMOGLOBIN

See:  Hemoglobin A1C

TEST NAME

GLYCOSYLATED HEMOGLOBIN

See: Hemoglobin A1C

TEST NAME

GRAM STAIN

See:  Gram Stain Direct Microbiology Section
In Pt Micro  / Regional Pt Micro

TEST NAME

GROUP A STREP SCREEN (THROAT)

See:  Microbiology Section
In Pt Micro  / Regional Pt Micro

TEST NAME

GROUP B STREP CULTURE/OB

See:  Microbiology Section
In Pt Micro  / Regional Pt Micro

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:  1 ml serum from a SST or plain red top tube. 
Processing: Send refrigerated to Mayo.  Frozen specimens will also be accepted. Mayo # 8688.
Performed: 1 day.  Test set up Tuesday, Thursday, Saturday
Reference value:   Males:  < 1.5 ng/mL
Females: < 4.0 ng/mL
Method:  Immunoenzymatic immunoassay
CPT Code: 83003

TEST NAME

GUAIAC TEST

See:  Hemoccult

TEST NAME

GUTTER WASHINGS CYTOLOGY

See: Cytology Section Peritoneal Fluid