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Glucose Tolerance Test (GTT) - 5 Hour

Important Note

Male or non-pregnant female
Draw fasting glucose specimen & finger stick glucose
Give 75 gram glucola
Collect blood at the following intervals:

1 Hour Glucose

2 Hour Glucose

3 Hour Glucose

4 Hour Glucose

5 Hour Glucose

Icon & Photos

Grey Potassium Oxalate

Specimen Requirements

Preferred:
Container/Tube: Grey Potassium Oxalate
Minimum Volume: 1.0 mL
Collection Instructions:
Also Acceptable:
Container/Tube: Mint Green Top (Lithium Heparin Gel)

Specimen Stability

Ambient: 8 hours
Refrigerate: 48 hours
Frozen: aliquot for longer storage

Reference Range

Fasting Glucose: 70 – 125 mg/dL
1 Hour Glucose: 70 – 199 mg/dL
2 Hour Glucose: 70 – 199 mg/dL
3 Hour Glucose: 70 – 125 mg/dL
4 hour Glucose: 70-125 mg/dL
5 Hour Glucose: 70-125 mg/dL

The ADA criteria for prediabetes is a fasting plasma glucose of 100-125 mg/dL or 2hr post-glucose sample of 140-199 mg/dl

Methodology

O2 Depletion

CPT

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