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Clinical Trial Insulin
Test Code9561
CPT Codes
83525<br>Clinical Trial Code
Preferred Specimen
1 mL serum
Patient Preparation
A fasting specimen is required.
For tolerance testing, overnight fasting is required.
Minimum Volume
0.5 mL
Instructions
Draw fasting specimen. Collect 1 mL serum for each timed specimen post glucose dose. All tubes must be clearly
marked with time drawn. Submit all tubes with one test requisition.
marked with time drawn. Submit all tubes with one test requisition.
Transport Temperature
Refrigerated (cold packs)
Specimen Stability
Room temperature: 8 hours
Refrigerated: 7 days
Frozen: 28 days
Refrigerated: 7 days
Frozen: 28 days
Reject Criteria (Eg, hemolysis? Lipemia? Thaw/Other?)
Hemolysis • Plasma • Grossly icteric
Methodology
Immunoassay
Setup Schedule
Set up: Tues-Sat; Report available: Next day
Reference Range
2.0-19.6 uIU/mL
Note: Reference ranges exist for 30, 60, 90, 120, 150, 180, 240, and 300 minutes post glucose.
Note: Reference ranges exist for 30, 60, 90, 120, 150, 180, 240, and 300 minutes post glucose.
Clinical Significance
Total insulin levels are useful in assessing the available insulin in serum, including antibody-bound insulin. Serum insulin levels are useful in the differential diagnosis of fasting hypoglycemia.
