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Test Code INS Insulin, Serum

Additional Codes


Powerchart: Insulin Level

Epic: LAB527 Insulin, Total

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 Medical Laboratories in Rochester

Specimen Type


Specimen Required

Patient Preparation:

1. Patient should be fasting.

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

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 draw times.

3. Serum-gel tubes should be centrifuged within 2 hours of collection.

4. Red-top tubes should be centrifuged and aliquoted within 2 hours of collection.

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

Specimen Minimum Volume

0.5 mL

Specimen Stability Information

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

Reference Values

2.6-24.9 mcIU/mL


For SI unit Reference Values, see

Day(s) and Time(s) Performed

Monday through Friday; 5 a.m.-12 a.m.

Saturday; 6 a.m.-6 p.m.

Test Classification

This test has been cleared or approved by the U.S. 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 20448-7


Result ID Test Result Name Result LOINC Value
INS Insulin, S 20448-7

Reject Due To


Mild reject; Gross reject


Mild OK; Gross OK




Autopsy specimen

Method Name

Electrochemiluminescence Immunoassay


If not ordering electronically, complete, print, and send a General Request Form (T239) with the specimen (