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Glucose Tolerance,1hr 50g (OB)
MessageTest performed at York Hospital Laboratory.
Test Code
GTT50
Alias/See Also
Glucose, 1-Hour Post-Prandial
Glucose, 1-Hour Postprandial
Glucose, 1-Hour Postprandial
CPT Codes
82950
Preferred Specimen
0.2 mL serum collected in a serum separator tube (SST)
Other Acceptable Specimens
0.2 mL plasma collected in a lithium heparin (green-top) tube
Instructions
The pregnant patient is given 50g of Glucose, and the specimen is obtained 1 hour later. No food can be eaten between drinking the glucose and the blood draw. Remove serum or plasma from the cellular material within 2 hours.
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
Positive Screening: 1hr glucose >135 mg/dl
Clinical Significance
Simple glucose loading test, used to detect gestational diabetes at 24-28 weeks of gestation. Increased results should be confirmed by OGTT.
