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Glucose Tolerance, 3 Hour OB
MessageTest performed at York Hospital Laboratory.
Test Code
GTT3OB
CPT Codes
82951, 82952x2
Includes
Fasting Glucose
1 Hour Glucose
2 Hour Glucose
3 Hour Glucose
1 Hour Glucose
2 Hour Glucose
3 Hour Glucose
Preferred Specimen
Fasting specimen: 0.2 mL plasma collected in a lithium heparin (green-top) tube
Other specimens: 0.2 mL serum collected in a serum separator tube (SST)
NOTE: Either tube (SST or lithium heparin) is acceptable for each draw.
Other specimens: 0.2 mL serum collected in a serum separator tube (SST)
NOTE: Either tube (SST or lithium heparin) is acceptable for each draw.
Instructions
For collection procedure, refer to the "Glucose Tolerance Test Collection" procedure in the York Hospital Laboratory Handbook.
Transport Temperature
Refrigerated
Specimen Stability
Room temperature: 24 hours
Refrigerated: 7 days
Frozen: 1 year
Refrigerated: 7 days
Frozen: 1 year
Methodology
Spectrophotometry
Setup Schedule
Daily
Report Available
Next Day
Reference Range
Gestational Diabetes Mellitus:
Two or more of the following concentrations must be met or exceeded for a positive diagnosis:
Fasting 95 mg/dL
1 Hour 180 mg/dL
2 Hour 155 mg/dL
3 Hour 140 mg/dL
Two or more of the following concentrations must be met or exceeded for a positive diagnosis:
Fasting 95 mg/dL
1 Hour 180 mg/dL
2 Hour 155 mg/dL
3 Hour 140 mg/dL
Clinical Significance
Glucose loading test, most sensitive test to detect gestational diabetes, is used to detect postprandial hypoglycemia. Abnormal results should be verified by repeat testing unless results are initially grossly abnormal.
