Test directory: 2 Hr Glucose Tolerance, Pregnancy

Ordering Code6644
Test Name2 Hr Glucose Tolerance, Pregnancy
AliasGlucose Tolerance Test - 2 Hr,
Pregnancy
GTT, 2 Hr, Pregnancy
Preferred SpecimenSerum
Note: If specimen cannot be properly processed within 1 hour of collection, collect blood in Oxalate/Fluoride (Gray).
Preferred ContainerSST (Gold)
Other Specimen/ContainerPlasma in Lithium Heparin (Green), Plasma in
Oxalate/Fluoride (Gray), Serum in Plain (Red)
Optimum Volume0.5 mL
Collection InstructionsPatient must be fasting 10-12 hours, minimum 8 hours
Draw fasting sample. Administer a 75 gram glucose load
Patient should remain inactive and receive nothing by mouth except for small amounts of water or ice. Collect blood specimen 1 hour and 2 hour post glucose load.
Handling InstructionsSeparate serum promptly.
Transport RequirementsOahu: Ambient
Airline: Refrigerated
Specimen StabilityAmbient: 24 Hours
Refrigerated: 7 Days
Frozen: 3 Months
Unprocessed Oxalate/Fluoride (Gray) blood is stable 3 days ambient.
Rejection CriteriaInsufficient quantity, Specimen older than stability limits,
Serum not spun (not separated from cells) within 1 hour
Avail. StatNO
Analytic Time1 Day
MethodologyUV Enzymatic (Hexokinase)

Reference range(s)

The reference ranges listed below are valid on this date of January 22, 2025.
ComponentAgeMale NormMale Critical LowMale Critical HighFemale NormFemale Critical HighFemale Critical LowUnitsAdd'l info
FastingALLYES
Glucola Dose:ALL75grams
Reaction To GlucolaALLSee report.
Special InstructionsALLSee report.
Glucose, FastingALL70-91>= 400<= 50mg/dL
Glucose, 1 HrALL70-179>= 400<= 50mg/dL
Glucose, 2 HrALL70-152>= 400<= 50mg/dL