Glucose Tolerance, 5 hours : 1003684

Test Code
GTT5 or 1003684

Alias/See Also
Glucose Tolerance Test

CPT Codes
82947, 82951, 82952x2

Instructions
Patient should fast 8 hours before the test begins.  The dose for Type 2 diabetes assessment is 75 grams.
 
Gray top tube (sodium fluoride), serum separator tube (gold top), or  plain red top tube  is collected  fasting prior to dose, and then at 1 hour, 2 hours, 3 hours,  4 hours, and 5 hours following the dose.

Transport Container
If gray top tubes (sodium fluoride/potassium oxalate) transport whole blood. Centrifuge the serum separator tubes and transport; if plain red top tubes, centrifuge and aliquot serum into standard transport tubes.  Clearly identify tubes as Fasting, 1 hour, 2 hour,  3 hour, 4 hour, and 5 hour collection.

Transport Temperature
Refrigerated.

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

Methodology
Glucose Hexokinase

Setup Schedule
Sunday - Saturday

Report Available
1 day

Reference Range
Fasting:                   70-99 mg/dL
60 minute post:     70-199 mg/dL
120 minute post:    70-139 mg/dL
180 minute post:    70-139 mg/dL
240 minute post:    70-139 mg/dL
300 minute post:    70-139 mg/dL


Clinical Significance
The glucose tolerance test measures the body's response to a glucose dose for diagnosis of Type 2 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.