Glucose Screen, OB, 50 gram (ACOG) : 1003250

Test Code
GTTOB1 or 1003250

Alias/See Also
Glucose Tolerance Test; Gestational Glucose Tolerance

CPT Codes

The dose for gestational diabetes assessment is 50 grams.
Gray top tube (sodium fluoride/potassium oxalate), serum separator tube (gold top), or  plain red top tube  is collected  1 hour following the dose.

Transport Container
 If gray top tube (sodium fluoride/potassium oxalate) transport whole blood. Centrifuge the serum separator tube and transport; if a plain red top tube, centrifuge and aliquot serum into a standard transport tube.  Clearly identify tube as 1 hour collection.

Transport Temperature

Specimen Stability
For Gray top tube only: Ambient Whole blood: 24 hours; After separation from cells for plasma or serum: Ambient: 24 hours; Refrigerated: 7 days; Frozen: Acceptable for longer storage

Glucose Hexokinase

Setup Schedule
Sunday - Saturday

Report Available
1 day

Reference Range
60 minute post: 70-135 mg/dL

For abnormal GTTOB1 result, ACOG recommends that Gestational Glucose Tolerance test be performed to diagnose diabetes. Therefore, it is suggested that the GTTOB3, Glucose Tolerance, OB, 3 hours, 100 gram (ACOG): 1003251 be ordered.

Clinical Significance
The gestational diabetes glucose screen test measures the body's response to a glucose dose for diagnosis of gestational diabetes.

Performing Laboratory
med fusion

The CPT Codes provided in this document are based on AMA guidelines and are for informational purposes only. CPT coding is the sole responsibility of the billing party. Please direct any questions regarding coding to the payor being billed. Any Profile/panel component may be ordered separately. Reflex tests are performed at an additional charge.