Normal Serum Insulin Level Range

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Alternative Names

5-HT level; 5-hydroxytryptamine level; Serotonin test

Normal Values

The normal range is 101-283 nanograms per milliliter (ng/mL).

Note: Normal value ranges may vary slightly among different laboratories. Talk to your doctor about the meaning of your specific test results.

What abnormal results mean

Higher-than-normal levels may indicate carcinoid syndrome.

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