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Test Code LAB5087 Glucose Tolerance Test (GTT), Gestational, 1 Hour Post Dose

Important Note

Maternal Glucose Tolerance Testing

Ordering mnemonics: only order

  • MGT1HG (post glucola - 1 hr specimen only)

Performing Laboratory

 Asante Rogue Regional Medical Center / Asante Three Rivers Medical Center

Specimen Minimum Volume

0.5 mL

Billing Code

2050649

Methodology

Oxygen Rate Electrode 

Specimen Requirements

Sodium Fl (NaF) Gray top tube - preferred

Lithium Heparin Green top tube (must be centrifuged within 1-2 hrs, preferably within 1 hr)

 

Yellow (Gold) top tube (SST)

 

Gray Top Tube (NaF), if centrifuge not available.
Patient does NOT need to be fasting prior to the ingestion of 50 grams of dextrose.
 

Collect sample 1 hour after ingestion of dextrose.

Day(s) Test Set Up

Routine: Monday - Sunday
ASAP - 2 hours after receipt of specimen in the lab
STAT - 1 hour after receipt of specimen in the lab

Test Classification and CPT Coding

82950 Glucose; post glucose dose

Additional Information

Use: Establish the diagnosis of diabetes mellitus, evaluation of disorders of carbohydrate metabolism; evaluation of acidosis and ketoacidosis; evaluation of dehydration, coma, hypoglycemia, of insulinoma, neuroglycopenia.

Specimen Transport Temperature and Stability

Centrifuge collection tube and refrigerate within 2 hours of collection.  Primary tube: Spun SST stable 24 hours at 2° to 8° C.  Serum stable 48 hours if aliquoted and refrigerated at 2° to 8° C.

Performing Department

Chemistry