Glucose Tolerance, 5 hour (GTT 5HR)
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| Synonyms:
| 5 hour GTT |
| Specimen: | Blood, (1) SST (serum separator), Red (no preservative), Green (lithium heparin)or Gray (sodium fluoride and potassium oxalate) top vacutainer tube.
Label tubes with collection times.
A fasting glucose is drawn and analyzed. If the fasting glucose does not exceed 140 mg/dL, a 75 gram glucose drink is administered for adults (1.75 g/kg of body weight for children).
After completion of the drink, collect specimens at intervals of 30 minutes, 1 hour, 1 1/2 hour, 2 hour, 3 hour, 4 and 5 hour |
| Volume: | Full primary tube |
| Minimum Volume: | 100 microL plasma/serum |
| Collection: | If tube other than an SST or PST (plasma separator tube) is collected, transfer serum or plasma to a tightly capped plastic aliquot tube for transport.
Refrigerate at 2-8°C for 7 days; sodium fluoride and potassium oxalate is stable at room temperature for 24 hours.
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| Rejection Criteria: | Gross hemolysis; improper labeling. |
| Reference Range: | See Pathology Interpretive Report |
| Methodology: | |
| Test Use: | Used in the diagnosis of hypolycemia |
| Additional Information: | No Additional Information Listed |
| Testing Includes: | Fasting glucose,
75 gram glucose drink for adults (1.75 g/kg of body weight for children).
Glucose levels collected at 30 minutes, 1, 1 1/2, 2, 3, 4, and 5 hours after completion of drink. |
| Testing Facility: | AnMed Laboratory |