Posted Date
Effective Date
Test Name
Rheumatoid Factor, Serum
Update Type
Test Down or Delayed
CPT Code
86431
Order Code
RF
TEST DOWN
Rheumatoid Factor
Order Code: RF
Fee Code: 30902 (CPT 86431)
LOINC: 15205-8
Effective June 30, 2026, Michigan Medicine Laboratories Immunology-Special Chemistry lab test, Rheumatoid Factor, will be down indefinitely due to reagent unavailability. Specimens will be referred to Mayo Clinic Laboratories until further notice (order code RHUT).
Collection Instructions: Collect specimen in an SST or red top tube. Centrifuge and aliquot 1 mL of serum into a plastic vial and refrigerate.