Rheumatoid Factor

Overview

  • EPIC Code:
  • IMO35
  • Soft Test Code:
  • RF1
Alternate Names
  • RA
  • RA Titer
  • RF
  • RF Screen
  • Rheumatoid Arthritis
  • Rheumatoid Factor Screen
Clinical Significance

Positive results are consistent with, but not specific for, rheumatoid arthritis.


Specimen Collection & Preparation

Specimen Requirements:

-OR-

1.0 mL Serum in a SST Gold Top Tube
Minimum Volume:
0.25 mL Serum*

* This volume does not allow for repeat testing

Transport and Storage:
  • Ambient (18-24°C): 24 Hours
  • Refrigerated (2-8°C): 8 Days
  • Frozen (-20° C or colder): 3 Months

Clinical Interpretation

Reference Range:

< 14 IU/mL


Methodology:
  • Immunoturbidimetric
Clinical Significance

Positive results are consistent with, but not specific for, rheumatoid arthritis.


Production Schedule

Sites Performed
  • Parkview Regional Medical Center
Days Performed
Sunday
Monday
Tuesday
Wednesday
Thursday
Friday
Saturday
Departments
  • Chemistry
Turn Around Time

Same day/next day


Coding & Compliance

CDM

01456624


CPT Coding

86431


Medical Necessity Documentation

Duplicate testing on this test is not acceptable per Medicare: testing to only be done every 365 days