UW Hospital and Clinics Lab Test Directory
| Test Name: |
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Glucose Tolerance, 2 hour
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| Test Code(s): |
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GLUTOL2 / HC2HRGLUC
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| CPT Code(s): |
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82947, 82950
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| Test Description: |
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Test Component: Fasting glucose and 2 hour draw after administration of a glucose containing solution.
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| Methodology: |
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Hexokinase
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| Days Performed: |
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Daily, 24 hours.
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| Turnaround Time: |
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Stat: Not available stat.
Routine: 4 hours.
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Specimen Requirements
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| Specimen: |
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Blood
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| Patient Preparation: |
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Patient should have nothing to eat or drink (except water) for 8-10 hours before test.
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| Collection Instructions: |
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A fasting blood glucose specimen is drawn. The patient ingests a solution containing 75 gm of glucose. A second blood specimen is drawn 2 hours post-ingestion.
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| Collection Container: |
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Preferred: Green cap with yellow ring (PST)
Also Acceptable:
Green top,
Red cap with yellow ring (SST),
Red top
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| Collection Volume: |
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Preferred: 1 mL
Pediatrics: 0.3 mL
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| Sample Analyzed: |
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Plasma or serum
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| Volume Required: |
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Preferred: 0.5 mL
Pediatrics: 0.1 mL
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| Specimen Processing: |
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Centrifuge. If a complete barrier has not formed, transfer cell-free plasma/serum to plastic vial. Refrigerate.
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| Specimen Transport: |
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Transport specimen to UWHC Core Laboratory (B4/220). Transport with coolant pack if coming from outreach location.
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| Stability: |
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Ambient: 8 hours
Refrigerated: PST - 48 hrs; if off cells or SST - 4 days
Frozen: okay
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Interpretation
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| Critical Calls: |
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View
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Oral Glucose Tolerance Test
Glucose Challenge
OGTT
OTT
GTT
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