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Test Code FIL6SM Interleukin 6, Plasma

Additional Codes



Specimen Required

Collection Container/Tube: Lavender-top (EDTA)

Submission Container/Tube: Plastic vial

Specimen Volume: 0.5 mL

Collection Instructions:

1. Immediately after specimen collection, place the tube on wet ice.

2. Centrifuge at 1500 x g for 10 minutes and aliquot plasma into plastic vial.

3. Freeze specimen within 30 minutes.

Secondary ID


Useful For

Evaluation of patients with suspected systemic infection


Evaluation of patients with suspected localized infection, specifically prosthetic joint infection (PJI)


Evaluation of patients with suspected chronic inflammatory disorders, such as rheumatoid arthritis, systemic lupus erythematosus, ankylosing spondylitis, or inflammatory bowel disease

Method Name


Reporting Name

Interleukin 6, P

Specimen Type

Plasma EDTA

Specimen Minimum Volume

0.3 mL

Specimen Stability Information

Specimen Type Temperature Time Special Container
Plasma EDTA Frozen (preferred) 21 days
  Refrigerated  24 hours

Reject Due To

Gross hemolysis OK
Gross lipemia Reject
Gross icterus OK

Reference Values

≤1.8 pg/mL

Day(s) Performed

Monday through Friday, Varies

Report Available

1 day

Performing Laboratory

Mayo Clinic Laboratories in Rochester

Test Classification

This test was developed and its performance characteristics determined by Mayo Clinic in a manner consistent with CLIA requirements. This test has not been cleared or approved by the U.S. Food and Drug Administration.

CPT Code Information


LOINC Code Information

Test ID Test Order Name Order LOINC Value
IL6 Interleukin 6, P 26881-3


Result ID Test Result Name Result LOINC Value
63020 Interleukin 6, P 26881-3


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