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Test Code 130 Glucose Gestational Screen 50 Gm Load

Additional Codes


PowerChart: Glucose Level 50 Gm Load

MA Cerner: Glucose, 50 gm Load.

Specimen Requirement

0.5 mL serum or plasma is required.

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.

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).



Testing is performed Monday through Friday.

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

CPT Code Information

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

LOINC Code Information

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

Test Method

MercyOne DBQ:

Timed Endpoint; Beckman DXC880i

Mercy DV and MQMA:

Catalytic Oxidation Electrode; iSTAT

MA East and West:

Enzymatic Colorimetric Method; Roche Cobas 6000

Reference Values

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

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.