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Test Code INS Insulin, Serum

Additional Codes


Powerchart: Insulin Level

MA Cerner: Insulin Level

Reporting Name

Insulin, S

Useful For

Diagnosing insulinoma, when used in conjunction with proinsulin and C-peptide measurements


Management of diabetes mellitus

Performing Laboratory

Mayo Clinic Laboratories in Rochester

Specimen Type


Ordering Guidance

Patients on insulin therapy may develop anti-insulin antibodies. These antibodies may interfere in the assay system, causing inaccurate results. In such individuals, measurement of free insulin INSFT / Insulin, Free and Total, Serum should be performed.

Specimen Required

Patient Preparation:

1. Patient should be fasting.

2. For 12 hours before specimen collection do not take multivitamins or dietary supplements containing biotin (vitamin B7), which is commonly found in hair, skin, and nail supplements and multivitamins.

Supplies: Sarstedt 5 mL Aliquot Tube (T914)

Collection Container/Tube:

Preferred: Serum gel

Acceptable: Red top

Submission Container/Tube: Plastic vial

Specimen Volume: 1 mL

Collection Instructions:

1. Avoid hemolysis

2. Label specimens with corresponding collection times.

3. Centrifuge and aliquot serum into plastic vial within 2 hours of collection.

Additional Information: If multiple specimens are drawn, send separate order for each specimen.

Specimen Minimum Volume

0.75 mL

Specimen Stability Information

Specimen Type Temperature Time Special Container
Serum Frozen (preferred) 180 days
  Refrigerated  7 days

Reference Values

2.6-24.9 mcIU/mL


For SI unit Reference Values, see

Day(s) Performed

Monday through Friday

Test Classification

This test has been cleared, approved, or is exempt by the US Food and Drug Administration and is used per manufacturer's instructions. Performance characteristics were verified by Mayo Clinic in a manner consistent with CLIA requirements.

CPT Code Information


LOINC Code Information

Test ID Test Order Name Order LOINC Value
INS Insulin, S 27873-9


Result ID Test Result Name Result LOINC Value
INS Insulin, S 27873-9

Report Available

1 to 3 days

Reject Due To

Gross hemolysis Reject
Gross lipemia OK
Autopsy specimen Reject

Method Name

Electrochemiluminescence Immunoassay (ECLIA)