Gestational 2 Hr Glucose Tolerance Test (ADA) GTT2G

Synonyms

Allscripts (AEHR) Order Name

Not Orderable

Sunrise Clinical Manager (SCM) Order Name

Gestational 2 Hr Glucose Tolerance Test (ADA)

EPIC Order Name

75g ADA Gestational Glucose Tolerance Test (Fasting, 1, 2 hours)

Clinical Info

Specimen Type

Blood

Container

Gray Top Tube

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 75 g dose of Glucola (patient must drink entire beverage within 5 minutes).
5. Draw blood specimens at 1 hour and 2 hours post Glucola ingestion.
 Note:  Label specimens appropriately (fasting, 1 hour, and 2 hour).

Transport Instructions

Refrigerate

Specimen Stability

Methodology

Enzymatic

Days Performed

Monday through Sunday

Performing Laboratory

Northwell Health Laboratories

CPT

82951

PDM

145300602

Result Interpretation

ADA diagnostic criteria for gestational diabetes mellitus following 75-g glucose load test:

Fasting: 70 - 91 mg/dL
1 Hr :  70 - 179 mg/dL
2 Hr:   70 - 152 mg/dL

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

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