Glucose Tolerance Test (GTT), Blood/Urine, 5 Specimens
| Glucose Tolerance Test (GTT), Blood/Urine, 5 Specimens | | | |
| Number | | 203224 |
| CPT | | 81005 (x5); 82951; 82952 (x2) |
| Synonyms | | GTT ; OGTT ; Oral Glucose Tolerance Test |
| Specimen | | Serum or plasma and urine |
| Volume | | 2 mL serum or plasma each and 50 mL urine each |
| Minimum Volume | | 0.5 mL serum or 1 mL plasma |
| Container | | Gel-barrier tubes (5) or gray-top (sodium fluoride/potassium oxalate) tubes (5) and urine containers (5) |
| Collection | | Separate serum or plasma from cells within 45 minutes of collection. Label each tube with patient's name and time interval. Submit 2 mL serum or sodium fluoride plasma for fasting and each time interval (30 minutes, 1 hour, 11/2 hours, 2 hours, 21/2 hours, etc). Submit 50 mL urine in labeled containers. |
| Storage Instructions | | Refrigerate |
| Patient Preparation | | Patient should fast 12-14 hours before collection of specimens. |
| Causes for Rejection | | Patient not arriving in a fasting state; stressed patient (surgery, infection, corticosteroids) should not have GTT; specimen not labeled with hourly times |
| Reference Interval | | See report for reference interval. Note: Values are based on 75-g oral glucose challenge. |
| Methodology | | Enzymatic |
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