Evaluate for insulin producing neoplasm (islet cell tumor, insulinoma) or pancreatic islet cell hyperplasia to work up hypoglycemia, possibly, to evaluate insulin production in diabetes mellitus.
Fasting level: 1 - 21 mcU/mL in conjunction with a normal serum glucose value. Insulin values obtained during a glucose tolerance test must be interpreted by a physician.
Unable to distinguish endogenous insulin in patients receiving exogenous insulin. Insulin antibodies are a problem in diabetic patients, and may invalidate insulin assays on diabetic patients who have been treated with animal insulins.
- Immunoreactive Insulin
- INSULIN LEVEL
Collect specimen in a green top tube from a fasting patient. Centrifuge, aliquot plasma into a plastic vial and freeze within 1 hour.