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Test Code GT3 GLUCOSE TOLERANCE 3HR,GEST

Important Note

3 hour Glucose Tolerance tests must be scheduled with Porter Laboratory

Please call 802-388-4747 to schedule.

See Gestational Screening and 3 hour test in Resources for more information.

Additional Codes

LAB2183

Performing Laboratory

Porter Hospital Laboratory

Specimen Requirements

Specimen Type:  Blood

Container/Tube:  Grey

Specimen Volume:  Full tube, submit 1.0 mL
Specimen Minimum Volume: 0.5 mL
Collection Instructions:
    1. Send specimen in original tube.
    2. If there is a delay in transport of >1 hour, centrifuge tube.
    3. Centrifuged PLASMA samples are stable for:
     •  24 hours a 2-8°C

NOTE: Specimen must be submitted 3 hours post glucose dose. 

Specimen Transport Temperature

Refrigerated

Test Schedule / Analytical Time / Test Priority / Turn Around Time

Monday – Friday / Not Available STAT / Routine - 4 hours

Test Classification and CPT Coding

82951 & 82952

Normal Reference Values

70-99 mg/dL

Critical Values

*New range as of 3/17/2025

*0 - 18 years:  <50 and >300 mg/dL

18 years and up:  ≤55 and >500 mg/dL