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Test Code GLU TOL Glucose Tolerance Testing

Additional Codes

GLUCOSE TOLERANCE TESTING FASTING [LAB081],GLUCOSE TOLERANCE TEST, 1HR [LAB1816],GLUCOSE TOLERANCE TEST, 2HR [LAB1777],

GLUCOSE TOLERANCE TEST, 3HR [LAB1818], GLUCOSE TOLERANCE TEST, 4HR [LAB165],

GLUCOSE TOLERANCE TEST, 5HR [LAB167], GLUCOSE TOLERANCE TEST, 6HR [LAB3099]

Patient Preparation

Fasting

Collection Method

Venous collection

Minimum Volume

0.5ml

Container

Grey Top / Sodium Fluoride Potassium Oxalate

Acceptable Specimens

Serum:

  • Gold Top SST
  • Red Top


Plasma:

  • Light Geen Top (lithium heparin)
  • Grey Top(Sodium Fluoride/Potassium Oxalate)

Reference or Target Ranges

Normal Fasting Less than 110 mg/dL
Glucose Tolerance 1 Hour Less than 200 mg/dL
Glucose Tolerance 2 Hour Less than 140 mg/dL
Glucose Tolerance 3 Hour Less than 140 mg/dL
Glucose Tolerance 4 Hour Less than 140 mg/dL
Glucose Tolerance 5 Hour Less than 140 mg/dL
Glucose Tolerance 6 Hour Less than 140 mg/dL

 

Reportable Units

mg/dl

Critical Value

0 up to 1 Week <40 mg/dL or  >500 mg/dL
> 1 Week <50 mg/dL or >500 mg/dL

Reasons for Rejection

Hemolysis Threshold 1000 mg/dL
Icterus Threshold 60 mg/dL
Lipemia Threshold 1000 mg/dL
Other QNS, contaminated, improperly Labeled, improper specimen type

Specimen Stability

Ambient 8 hours
Refrigerated (4°C to 8°C) 72 hours
Frozen(-40°C to 0°C) N/A

Performance Information

Days and Time Performed 24/7
Expected Turn Around Time Stat: 1 hour
Routine: 4 hours
Stat Availability Yes
Performing Bench CPH Chemistry
Methodology/Method Description Roche Cobas

CPT Codes

82947

Last review/edit date

2025