Rheumatoid Factor (RF)

CPT: 86431
Autoimmune

What This Test Measures

Autoantibody against IgG; elevated in rheumatoid arthritis, Sjogren's, and other inflammatory conditions.

Preparation

No fasting required

General guidelines only. Requirements vary by lab and individual. Confirm with your provider before adjusting any medications.

Turnaround Time

Varies by lab

Clinical Notes

70-80% sensitivity for RA; less specific than anti-CCP; can be positive in many conditions

ICD-10 Codes

Common diagnosis codes associated with this test. Codes are assigned by your provider.

M06.9Rheumatoid arthritis, unspecified
M35.9Systemic involvement of connective tissue, unspecified

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Lab Codes

Proprietary codes used by each lab for this test.

ARUP Laboratories
0050465(order_code)
BioReference Laboratories
0796-3(order)
LabCorp
006502(order_code)
Mayo Clinic Labs
RF(order_code)
Quest Diagnostics
4418(order_code)

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For informational purposes only

This page is for educational and research purposes only and does not constitute medical advice, diagnosis, or treatment recommendations. ICD-10 and CPT codes are assigned by your healthcare provider. Always consult a qualified healthcare provider before ordering any lab test or making decisions about your health.