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Test Code GLU50C Glucose Gestational Screen 50 Gm Load LAB2477

Test Method

Timed Endpoint; Beckman DXC600


Testing is performed Monday through Friday.

Typically completed within 4 hours after the specimen
arrives at the testing site.

Useful For

The 50 gm load is a screening test for Gestational Diabetes
Melitis; diagnosis is based on a full Oral Glucose
Tolerance Test (OGTT).


Specimen Requirement

0.5 mL serum or plasma is required.

CPT Code Information

82947 Chemistry: Glucose Testing Glucose; quantitative, blood
(except reagent strip)

Reference Values

> 130 mg/dL one hour post dose; Gestational Diabetes

This threshold identifies about 90% of women with Gestational
Diabetes Melitis (GDM). A threshold value of >140 mg/dL with
this screen identifies about 80% of women with GDM.

LOINC Code Information

10449-7 Glucose [Mass/Volume] In Serum Or Plasma-1 Hour Post

Additional Specimen Collection Information

Collect blood in a lithium heparin, green-top or red-top
tube one hour after the patient has consumed one 50 g bottle of
glucose drink. PST and SST (gel tubes) are acceptable. Samples with
≥ 3+ lipemia must be cleared prior to analysis. The serum or
plasma must be physically separated from the cells within 2 hours
of collection. 
The patient need not be fasting. The patient should remain seated
throughout the procedure. The patient may have water to drink but
nothing else. Coffee and smoking materials are prohibited.