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HelpTest Code GLU TOL 1HR Glucose Tolerance Test, 1HR
Additional Codes
GLUCOSE TOLERANCE TEST, 1HR [LAB1816]
Collection Method
Venous collection
Container
Lt Green / Plasma Separator / Lithium Heparin
Specimen Type
Preferred
Plasma- Light Green Top
Acceptable
Serum- Gold Top SST or Red Top
Minimum Volume
0.5ml
Specimen Stability
| Ambient | 8 hours |
| Refrigerated (4°C to 8°C) | 3 days |
| Frozen(-40°C to 0°C) | N/A |
3 days at 15-25°C only fluoride plasma (grey top)
Reference or Target Ranges
| FASTING | 65-99 mg/dL |
| 1 HR | 65-154 mg/dL |
A glucose value ≥155 mg/dL suggests impaired glucose regulation; additional testing is recommended.
Reportable Units
mg/dl
Critical Value
<50 mg/dL or >500 mg/dL
Reasons for Rejection
| Hemolysis Threshold | 1000 mg/dL |
| Icterus Threshold | 60 mg/dL |
| Lipemia Threshold | 1000 mg/dL |
| Other | QNS, contaminated, improperly Labeled, improper specimen type |
Performance Information
| Days and Time Performed | 24/7 |
| Expected Turn Around Time |
Stat: 1 hour Routine: 4 hours |
| Stat Availability | Yes |
| Performing Bench | CPH Chemistry |
| Methodology/Method Description | Roche Cobas |
CPT Codes
82951
Last review/edit date
2025