| Ordering Code | 180 |
|---|---|
| Test Name | 3 Hr Glucose Tolerance |
| Alias | 3 Hour GTT |
| Profile Contains |
|
| Preferred Specimen | Serum Note: If specimen cannot be properly processed within 1 hour of collection, collect blood in Oxalate/Fluoride (Gray). |
| Preferred Container | 2 SS (Serum/Separator - Red/Grey or Gold) |
| Optimum Volume | 0.5 mL |
| Collection Instructions | Requires pathologist approval Draw a fasting blood sugar before administering 75-gram glucose, and draw blood at one, two, and three hour intervals. Label each tube with patient's name, secondary identifier, and collection time interval (i.e. fasting, one-hour, two-hour, and three-hour). |
| Handling Instructions | Serum or Heparin Plasma must be separated from cells within one hour from collection. If specimen cannot be properly processed within 1 hour of collection, collect blood in Oxalate/Fluoride (Gray). |
| Transport Requirements | Oahu: Ambient Airline: Refrigerated |
| Specimen Stability | Ambient: 24 Hours Refrigerated: 7 Days Frozen: 3 Months Unprocessed Oxalate/Fluoride (Gray) blood is stable for 3 days Ambient. |
| Avail. Stat | NO |
| Analytic Time | 1 Day |
Reference range(s) for 3 Hr Glucose Tol (Blood)
The reference ranges listed below are valid on this date of December 5, 2024.
| Component | Age | Male Norm | Male Critical Low | Male Critical High | Female Norm | Female Critical High | Female Critical Low | Units | Add'l info |
|---|---|---|---|---|---|---|---|---|---|
| Glucose, Fasting | ALL | FAST: 70-99 | <= 50 | >= 400 | FAST: 70-99 | >= 400 | <= 50 | mg/dL | |
| Glucose,1 Hr | ALL | 70-199 | <= 50 | >= 400 | 70-199 | >= 400 | <= 50 | mg/dL | |
| Glucose,2 Hr | ALL | 70-139 | <= 50 | >= 400 | 70-139 | >= 400 | <= 50 | mg/dL | |
| Glucose,3 Hr | ALL | 70-139 | <= 50 | >= 400 | 70-139 | >= 400 | <= 50 | mg/dL |