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Test Code GLT2 GLUCOSE TOLERANCE,2 HOUR

Important Note

Test subject to Medicare National Coverage Determination (NCD).

See Medical Necessity documentation requirements by clicking on link below:

Medicare National Coverage Determinations (NCD) Coding Policy Manual and Change Report

Additional Codes

LAB169

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 at 2-8°

NOTE: Collect specimen 2 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

82950; 82947

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