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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"
Preferred Specimen
3 ml plasma (grey top NA Fluroide)
Patient Preparation
Glucose load (adults: 75 g glucose; pediatrics: 1.75 g/kg body weight, up to 75 g)
Administer 75g glucola otherwise unless specified by physician.
For pediatric or for small adults weighing less than 95 Lbs. refer to procedure
Adjusting the Amount (Dose) of the Glucose Drink powerdms.com/docs/730099
and contact a Clinical Laboratory Scientist (CS) or a Pathologist.
If patient weighs less than 45 lbs. refer to a pathologist.
Patient should NOT be allowed to leave the area of the duration of the testing, unless specifically instructed by their physician , or if performing a post-prandial tolerance test.
The glucose drink must be completely consumed within 5 minutes.
Glucola® contains corn syrup, if the patient has a corn allergy refer them to the ordering provider.
We will accept Glucose Tolerance drinks brought in by the patient if the drink specifies the dose of glucose which matches the test
being done and is already approved by their physician to use. The glucose load sample must be in liquid form, and any mixing of the sample must be performed by the patient prior to arriving for collection. Please note the drink and patients' statement regarding their physician approving the drink in comments.
Minimum Volume
0.5 mL
Other Acceptable Specimens
Alternative Specimen : Serum (SST)
Instructions
Routine venipuncture Gray top (sodium fluoride) tube; 3 blood draws Collect fasting, then post 75g Glucola administration (unless otherwise specified by physician) 1hr, and 2hr specimens.
Transport Temperature
Send Refrigeratoed (2-8C)
Specimen Stability
Stable refrigerated 3 days
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
Slide technology using the glucose oxidase reaction
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 50 or greater the 450 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.
Performing Laboratory
Community Hospital of the Monterey Peninsula Laboratory
23625 Holman Hwy, Monterey CA 93940
Phone: 831-625-4811; Fax: 831-625-4793
Medical Director: Jeffrey T. Keating M.D.; David L. Gardner M.D.; Andrew Szmit M.D.
