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Test Name:
Glucose Challenge, 50 g, Gestational
- SBMF No:
29004 - Performance Lab Name:
Automated Lab - Test Mnemonic:
GLU T MEAL - ABN:
Not required - CPT Code:
82950 - LOINC Code:
1504-0 - Test Includes:
50 g glucose dose
1-hour post-glucose test result - Also Known As:
Glucose, Postprandial, Pregnancy (50 g)
Gestational 50 g Glucose Challenge
Gestational Glucose Challenge
GCT - Also See:
29129 Glucose, Plasma
29057 Glucose Tolerance, Gestational
29056 Glucose Tolerance, Modified (ADA), Non-Gestational - Spec Type:
Plasma - Spec Container:
Light green top (PST) tube - Alt Spec Type:
Plasma - Alt Spec Container:
Gray top (fluoride/oxalate) tube
Note: Although not preferred, serum samples are acceptable, but must be removed from cells within 60 minutes of collection and refrigerated - Pref Vol:
1.0 mL - Min Vol:
0.3 mL - Fasting:
No - Patient Prep:
The care provider may instruct the patient to eat something 2-3 hours before the test to avoid nausea.
Fasting is not required unless specified by the care provider. - Spec Collect:
Routine venipuncture
Collect specimen 1 hour after ingestion of 50 g challenge dose - Spec Process:
PST or gray top tubes:
– Promptly centrifuge 15 minutes and refrigerate
Gold top or red top tubes:
– Clot 30 minutes
– Promptly centrifuge 15 minutes
– Within 60 minutes of collection, transfer serum to separate plastic tube and refrigerate - Spec Store Transport:
Refrigerated - Spec Stability:
1 week refrigerated (2-8°C) - Spec Reject:
Plasma or serum in contact with RBC more than 1 hour - Methodology:
Photometric - Use:
Establish the diagnosis of diabetes mellitus in the pregnant patient - Clinical Significance:
Based on recommendations made in 2002 by the Expert Committee of the American Diabetes Association (ADA) and by the World Health Organization (WHO), South Bend Medical Foundation has adjusted testing procedures and interpretative data for diabetes testing as summarized below. Recommendations for Diagnosing Gestational Diabetes: Glucose Challenge, Gestational (50 g dosage)Challenge test considered positive if:
– 1-hour plasma glucose (PG) result equal to or greater than 140 mg/dL
– Recommend follow-up 100 g diagnostic test (29057 Glucose Tolerance, Gestational) - Reference Range:
1-hour plasma glucose (PG) result is less than 140 mg/dL - Additional Test Info:
Recommendations for Diagnosing Gestational Diabetes: ADA and WHO continue to recommend an oral glucose tolerance test for establishing the diagnosis of gestational diabetes, however, the following modifications have been made to the recommendations in 2000:
– Low-risk patients do not require testing. Low-risk status applies to women with all of the following criteria:
- Age less than 25 years
- Weight normal before pregnancy
- Member of an ethnic group with a low prevalence of gestational diabetes
- No known diabetes in first-degree relatives
- No history of abnormal glucose tolerance
- No history of poor obstetric outcome
– High-risk patients should undergo immediate testing. This applies to women with any of these criteria:
- Marked obesity
- Personal history of gestational diabetes
- Glycosuria
- Strong family history of diabetes
Average-risk patients (falling between low-risk and high-risk) should be tested at 24-28 weeks gestation - Day Run:
Mon-Sat - Time Run:
As received - Time Reported:
Same day - Test Type:
CHEMISTRY
