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HelpTest Code LAB164 Glucose Tolerance, 3 Hour - Pregnant Female
Department
CHEMISTRY
Collection Requirements
This is the standard 3 hour glucose tolerance test used to confirm the diagnosis of gestational diabetes in pregnant females.
8 hour fast is required
Patient should be on a high carbohydrate diet for 72 hours prior to the test.
Draw the fasting glucose as soon as possible after patient’s arrival.
Give 100 grams of prepared dextrose and then draw a glucose specimen one, two and 3 hours after the prepared dextrose.
Verify each collection for the exact draw time. Do not accept default draw times.
Primary Collection Container
Green PST (Lithium Heparin)
Transport
Plasma refrigerated
Preferred Transport Temperature
Refrigerated
Processing
Centrifuge and refrigerate.
Separate from cells if testing is delayed more than 2 hours.
Deliver to Chemistry ASAP.
Stability
Refrigerated: 72 hours
Minimum Testing Volume
0.5 mL
Reference Range
By report
Methodology
Hexokinase (HK) Roche c503
Performed
Sunday – Saturday
Reported
As completed
CPT Codes
82951, 82952
Unacceptable Conditions
Gross hemolysis.
Delay in separating cells from plasma.
Additional Information
Test includes: Fasting, 1, 2 and 3 hour glucose, and an interpretation guideline for the diagnosis of Gestational Diabetes.