Rheumatoid Factor (IgM)

Test Code

17743

CPT Codes
83520

Preferred Specimen

1 mL serum collected in a red-top tube (no gel)

Patient Preparation
Overnight fasting is preferred

Minimum Volume

0.3 mL

Transport Temperature

Refrigerated (cold packs)

Specimen Stability

Room temperature: 48 hours
Refrigerated: 8 days
Frozen: 28 days

Reject Criteria (Eg, hemolysis? Lipemia? Thaw/Other?)

Gross hemolysis • Gross lipemia • Grossly icteric • Heat treated samples • Serum separator tube (SST®)

Methodology
Immunoassay (IA)

Setup Schedule

Set up: Tues, Sat; Report available: 1-4 days

Reference Range

≤6 Negative

>6 Positive

Clinical Significance

In conjunction with clinical findings and other laboratory tests, the presence of rheumatoid factor (RF) can be used to aid in the diagnosis of rheumatoid arthritis.

Performing Laboratory
Quest Diagnostics Nichols Institute
14225 Newbrook Drive
Chantilly, VA 20153

The CPT Codes provided in this document are based on AMA guidelines and are for informational purposes only. CPT coding is the sole responsibility of the billing party. Please direct any questions regarding coding to the payor being billed. Any Profile/panel component may be ordered separately. Reflex tests are performed at an additional charge.