Test directory: 2 Hr Glucose Tolerance, Pregnancy

Ordering Code6644
Test Name2 Hr Glucose Tolerance, Pregnancy
AliasGlucose Tolerance Test - 2 Hr,
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)

ComponentAgeMale NormMale Critical LowMale Critical HighFemale NormFemale Critical HighFemale Critical LowUnitsAdd'l info
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