Gestational Glucose Tolerance Screen (50g ADA) PP1

Synonyms

Allscripts (AEHR) Order Name

50 gram Glucose Challenge, gestational

Sunrise Clinical Manager (SCM) Order Name

1 Hour Gestational Glucose Screen - 50g Glucose

Clinical Info

Screening test for gestational diabetes mellitus.
Perform a 50-g glucose load test (nonfasting), with plasma glucose measurement at 1 h post ingestion.
This test is typically performed at 24–28 weeks of gestation in individuals not previously diagnosed with diabetes.

Specimen Type

Blood

Container

Gray Top Tube

Collection Instructions

1. Fasting is not required.
2. Patient should be instructed to refrain from smoking and drinking coffee just before and during test.
3. Patient is given a 50 g dose of Glucola (patient must drink entire beverage within 5 minutes).
4. Draw blood specimen at 1 hour post Glucola ingestion.

Transport Instructions

Refrigerate. Specimen must arrive within 24 hours of draw.

Specimen Stability

Methodology

Hexokinase

Days Performed

Monday through Sunday

Performing Laboratory

Northwell Health Laboratories

CPT

82950

PDM

5302490

Result Interpretation

ADA diagnostic criteria for gestational diabetes mellitus following 50-g glucose load test:

1 Hr  post-glucose load:  70 - 134 mg/dL
 
In the absence of clear evidence supporting a cutoff of 135 mg/dL versus 140 mg/dL for the 1-h glucose screening test, it is suggested that health care providers select one of these as a single consistent cufoff for their practice, with factors such as a community prevalence rates of GDM consideration in the decision.

If the plasma glucose level measured 1 h after the load is ≥135 mg/dL, proceed to a 100-g oral glucose tolerance test. 

Diabetes Care 2023;46(Suppl. 1):S19–S40 https://doi.org/10.2337/dc23-S002 

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