Gestational Glucose Tolerance Test (Fasting, 1, 2, 3 hours, 100g ADA) 3 Hr Glucose Tolerance (Gest)

Synonyms

Allscripts (AEHR) Order Name

Not Orderable

Sunrise Clinical Manager (SCM) Order Name

Glucose Tolerance, 3 Hour, Gestational

Clinical Info

Specimen Type

Blood

Container

Grey-top (potassiumoxalate/sodium fluoride) tubes.
Note:  This test requires 4 separate tubes collected at fasting, 1 hour, 2 hours, and 3 hours post glucose load.

Collection Instructions

1. Patient should be instructed to fast for at least eight hours prior to collection of specimens.
2. Patient should be instructed to refrain from smoking and drinking coffee just before and during test.
3. Draw blood specimen for a fasting glucose.
4. After drawing fasting specimen, give the patient a 100 g dose of Glucola (patient must drink entire beverage within 5 minutes).
5. Draw blood specimens at 1 hour, 2 hours and 3 hours post Glucola ingestion.
Note:  Label specimens appropriately (fasting, 1 hour, 2 hour, and 3 hour).

Transport Instructions

Refrigerate

Specimen Stability

Methodology

Enzymatic

Days Performed

Monday through Sunday

Performing Laboratory

Northwell Core Lab at CFAM

CPT

82951
;

PDM

5300462

Result Interpretation

ADA diagnostic criteria for gestational diabetes mellitus following 100-g glucose load test:

Fasting: 70 - 94 mg/dL
1 Hour: 70 - 179  mg./dL
2 Hour: 70 - 154 mg/dL
3 Hour: 70 - 139 mg.dL

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

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