2 Hour Glucose Tolerance (Fasting, 1 and 2 hr) CL GTT2

Synonyms

Allscripts (AEHR) Order Name

Glucose Tolerance (Fasting, 1 Hr, 2 Hr)

Sunrise Clinical Manager (SCM) Order Name

Not Orderable

Clinical Info

Test Includes Fasting. 1 hour and 2 hour collection

Specimen Type

Blood

Container

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

TAT 1 Day

Performing Laboratory

Northwell Health Laboratories

CPT

82951

PDM

5300459

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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