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Test Code GEDS Gestational Diabetes Screen, Plasma

Specimen Type

Blood

Container

Gray top

Preferred Volume

4 mL

Offsite Collection Instructions

Specimen is collected 60 minutes after the ingestion of 50 gram glucose tolerance beverage. 

 

Refer to Glucose Tolerance Testing Collection link for further instructions.

 

Once per pregnancy.

UCMC Collection Instructions

Specimen is collected 60 minutes after the ingestion of 50 gram glucose tolerance beverage. 

 

Refer to Glucose Tolerance Testing Collection link for further instructions.
 

Once per pregnancy.

Availability

24/7

Turnaround Time

3 hours

STAT Availability

Not Available

Test Usage

The GDS test is a screening test for possible diabetes in pregnant patients. Without regard to prior food intake, venous plasma glucose is measured, usually between 24 and 28 weeks of pregnancy, at an interval of one hour following an oral dose of 50 mg of glucose.

Test Methodology

Spectrophotometric, endpoint

CPT Code

82950

Test Includes

quantitative determination of glucose in plasma

Reference Range

Refer to GDS procedure Glucose Tolerance Testing Collection link


Any result equal to or greater than 140 mg/dL, is considered abnormal. This level is recommended as a threshold to indicate the need for a full diagnostic glucose tolerance test, e.g. the Gestational Glucose Tolerance Test (GGTT). The GDS should identify the majority of women with gestational diabetes mellitus (GDM), although some false negative may occur, especially in patients who are not fasting

Critical Results

<40 or >500mg/dL

Minimum Volume

2 mL

Fee Code

43115