Glucose Tolerance Test, 2 Hr

CERNER / EPIC MNEMONIC: GTT-2 HR
POE DESCRIPTION: GLUCOSE TOLERANCE 2 HR; GTT-2 HR
CPT CODE: 82952 (x2)
DAYS PERFORMED: Specimen accepted daily, 24 hours
TURNAROUND TIME: 8 hours
SPECIAL INSTRUCTIONS: See Patient Instructions for Glucose Tolerance Test. A fasting glucose level is drawn from the patient. The patient is given orally a 75 gram solution of glucose. Two hours later, the patient's blood is drawn for a glucose assay.
CONTAINER TYPE: Gray top (sodium fluoride) tube
SPECIMEN REQUIREMENTS: Blood (plasma)
MINIMUM VOLUME: 2 mL blood (1 mL plasma)
HANDLING INSTRUCTIONS: Refrigerate
REFERENCE RANGE:

FASTING (> 8 hours)

60-99 mg/dL  Normal

100-125 mg/dL  Potentially indicative of impaired fasting glucose (IFG). Requires confirmation on subsequent day.

>126 mg/dL  Potentially indicative of diabetes mellitus. In absence of symptoms of unequivocal hyperglycemia, requires confirmation on subsequent day.

GTT 2 HR (after 75 g glucose challenge)

<140 mg/dL Normal</p/>

 

149-199 mg/dL  Potentially indicative of impaired glucose tolerance (IGT).  Requires confirmation on subsequent.

 

>200 mg/dL  Potentially indicative of diabetes mellitus.  In absence of symptoms of unequiivocal hyperglycemia, requires confirmation on subsequent day.

 

Reference: Diabetes Care, 30(Suppl. 1), S42-S47 (2007).

CRITICAL VALUES: <40, >500
TEST SYNONYM(S):GTT