Glucose Tolerance 3 Hour, OB

Test Code

LAB6023

Alias/See Also

GTTOB

CPT Codes
82951,82952x3

Includes

Fasting blood glucose followed by glucose levels drawn at timed intervals (1hr, 2hr, 3hr) after administration of a glucose load (100 g glucose)

Preferred Specimen

3 mL Grey Top NA Fluoride

Patient Preparation
Glucose load (adults: 100 g glucose; pediatrics: 1.75 g/kg body weight, up to 100 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

Alternate Specimen: serum (SST).

Instructions

"Routine venipuncture Collect fasting blood then administer 100g glucola unless specified by physician Collect fasting, 1hr, 2hr, and 3hr postglucose administration specimens. Gray top (sodium fluoride) tube; 4 blood draws"
Centrifuge within 2 hours of collection
Refrigerate within 4 hours.

Transport Temperature

Refrigerate (2-8C)

Specimen Stability

Stable refrigerated 3 days

Reject Criteria (Eg, hemolysis? Lipemia? Thaw/Other?)

Insufficient quantity, hemolysis, plasma left on cells overnight, failure to follow specimen requirements

Methodology
Slide technology using the glucose oxidase reaction

Setup Schedule

Daily

Report Available

Within 24hrs

Limitations

This test is for Obstetric patients only

Reference Range

"Glucose, Obsetric Fasting 65-95 mg/dL Glucose, Obstetric 1 Hour 65-180 mg/dL Glucose, Obstetric 2 hour 65-155 mg/dL Glucose, Obstetric 3 Hour 65-140 mg/dL Critical Value is less than 50 or greater than 450 mg/dL for any collection"

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.

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.