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Glucose Tolerance 2 Hour
Test CodeLAB169
Alias/See Also
GTT2, GT2H3
CPT Codes
82951, 82952 x2
Includes
"Fasting blood glucose followed by glucose levels drawn at timed intervals after administration of a glucose load (adults: 75 g glucose; pediatrics: 1.75 g/kg body weight, up to 75 g) Fasting, 1 hour post dose, 2 hour post dose"
Instructions
"Routine venipuncture Gray top (sodium fluoride) tube; 3 blood draws Collect fasting, 1hr, and 2hr postglucose administration specimens."
Specimen Stability
Room Temp
Reject Criteria (Eg, hemolysis? Lipemia? Thaw/Other?)
"Insufficient quanity,hemolysis, plasma left on cells overnight, failure to follow stability requirements.
Note: Anorexia or any condition preventing food intake invalidates the procedure"
Note: Anorexia or any condition preventing food intake invalidates the procedure"
Methodology
Oxygen rate
Setup Schedule
Daily
Report Available
Within 24 hrs
Reference Range
"Fasting: 74-106 mg/dL, 1 hour post dose: None established , mg/dl, 2 hour post dose: None established , mg/dl Critical for any: Less than 49 or greater the 451 mg/dL"
Clinical Significance
Glucose measurements are used in the diagnosis and treatment ofcarbohydrate metabolism disorders including diabetes mellitus, neonatalhypoglycemia, idiopathic hypoglycemia, and pancreatic islet cellcarcinoma.
