Test directory: 2 Hr Glucose Tolerance, Pregnancy

Ordering Code 6644
Test Name 2 Hr Glucose Tolerance, Pregnancy
Alias Glucose Tolerance Test - 2 Hr,
Pregnancy
GTT, 2 Hr, Pregnancy
Preferred Specimen Serum
Note: If specimen cannot be properly processed within 1 hour of collection, collect blood in Oxalate/Fluoride (Gray).
Preferred Container SST (Gold)
Other Specimen/Container Plasma in Lithium Heparin (Green), Plasma in
Oxalate/Fluoride (Gray), Serum in Plain (Red)
Optimum Volume 0.5 mL
Collection Instructions Patient 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 Instructions Separate serum promptly.
Transport Requirements Oahu: Ambient
Airline: Refrigerated
Specimen Stability Ambient: 24 Hours
Refrigerated: 7 Days
Frozen: 3 Months
Unprocessed Oxalate/Fluoride (Gray) blood is stable 3 days ambient.
Rejection Criteria Insufficient quantity, Specimen older than stability limits,
Serum not spun (not separated from cells) within 1 hour
Avail. Stat NO
Analytic Time 1 Day
Methodology UV Enzymatic (Hexokinase)

Reference range(s)

Component Age Male Norm Male Critical Low Male Critical High Female Norm Female Critical High Female Critical Low Units Add'l info
Fasting ALL YES
Glucola Dose: ALL 75 grams
Reaction To Glucola ALL See report.
Special Instructions ALL See report.
Glucose, Fasting ALL 70-91 >= 400 <= 50 mg/dL
Glucose, 1 Hr ALL 70-179 >= 400 <= 50 mg/dL
Glucose, 2 Hr ALL 70-152 >= 400 <= 50 mg/dL