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Test Code INSLN Insulin Level

Specimen Type



Red top

Preferred Volume

4 mL

UCMC Collection Instructions

Fasting (8-14 hours) is recommended but not required.


Tuesday and Friday 7:00 am -2:00 pm

Turnaround Time

24 – 72 hrs

STAT Availability

Not Available

Test Methodology

Chemiluminescent immunometric

CPT Code


Test Includes

quantitative measurement of insulin in serum

Reference Range

Fasting: <28.5 microIU/mL

Reference ranges for Insulin that is ordered as part of a specific stimulation/suppression protocol are specific to the protocol utilized by  the ordering physician and are therefore subject to ordering physician’s interpretation.

Test Limitations

Circulating anti-insulin antibodies are often found in patients who have been treated with nonhuman forms of insulin. If present, these antibodies may interfere with the assay.


For individuals who are significantly overweight, fasting insulin levels are typically somewhat higher than for adults of normal weight.

Minimum Volume

2 mL

Fee Code