Sign in →

Test Code RHUT Rheumatoid Factor, Serum

Important Note

This test is intended to be a reflex test for a positive Rheumatoid Factor, QL and should not be ordered for screening purposes.

Additional Codes


Powerchart: Rheumatoid Factor (DB)

MA Cerner: Rheumatoid Factor

Reporting Name

Rheumatoid Factor, S

Useful For

Diagnosis and prognosis of rheumatoid arthritis

Performing Laboratory

Mayo Clinic Laboratories in Rochester

Specimen Type


Additional Testing Requirements

An alternative or complementary assay to rheumatoid factor (RF) that has also demonstrated utility in the diagnosis and assessment of rheumatoid arthritis (RA) is CCP / Cyclic Citrullinated Peptide Antibodies, IgG, Serum. Utilization of both of these tests can provide clinical value in the diagnosis of RA. RF is not specific and may be present in other inflammatory rheumatic diseases and nonrheumatic diseases as well as in nonaffected individuals especially in those 60 years of age or older.

Specimen Required


Preferred: Serum gel

Acceptable: Red top

Specimen Volume: 1 mL

Specimen Minimum Volume

0.75 mL

Specimen Stability Information

Specimen Type Temperature Time Special Container
Serum Refrigerated (preferred) 14 days
  Ambient  14 days
  Frozen  14 days

Reference Values

<15 IU/mL

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
RHUT Rheumatoid Factor, S 11572-5


Result ID Test Result Name Result LOINC Value
RHUT Rheumatoid Factor, S 11572-5

Report Available

1 to 3 days

Reject Due To

Gross hemolysis Reject
Gross lipemia OK
Gross icterus OK

Method Name


Secondary ID



If not ordering electronically, complete, print, and send a Renal Diagnostics Test Request (T830) with the specimen.