Rheumatoid Factor (IgG)

Rheumatoid Factor (IgG)

Test Code

15683
83520
15683
83520
In-home collection may be available in your area for purchase through Quest Mobile.

Clinical Significance

Rheumatoid Factor (IgG) - 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.

Test Resources

Clinical Focus

Autoimmune Rheumatic and Related Diseases

Test Details

Patient Preparation

Overnight fasting is preferred

Methodology

Immunoassay (IA)

Reference Range(s)

≤6 U Negative
>6 U Positive

Alternative Name(s)

RF,RA,Rheumatoid arthritis

LOINC® Codes, Performing Laboratory

Service Area must be determined
Overnight fasting is preferred

Methodology

Immunoassay (IA)

Reference Range(s)

≤6 U Negative
>6 U Positive

Alternative Name(s)

RF,RA,Rheumatoid arthritis
Service Area must be determined

Preferred Specimen(s)

1 mL serum

Minimum Volume

0.3 mL

Transport Container

Transport tube

Transport Temperature

Refrigerated (cold packs)

Specimen Stability

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

Reject Criteria

Gross hemolysis • Grossly lipemic • Grossly icteric • Heat treated samples

Setup Schedule

Service Area must be determined
1 mL serum
0.3 mL
Transport tube
Refrigerated (cold packs)
Room temperature: 48 hours
Refrigerated: 8 days
Frozen: 28 days
Gross hemolysis • Grossly lipemic • Grossly icteric • Heat treated samples
Service Area must be determined
In-home collection may be available in your area for purchase through Quest Mobile.
Test Details

Clinical Significance

Test Resources

Reference ranges are provided as general guidance only. To interpret test results use the reference range in the laboratory report.

The CPT codes provided are based on AMA guidance and are for informational purposes only. CPT coding is the sole responsibility of the billing party. Please direct any questions regarding coding to the payer being billed.

This material contains content from LOINC® (http://loinc.org). The LOINC Table, LOINC Table Core are copyright © 1995-2019, Regenstrief Institute, Inc. and the Logical Observation Identifiers Names and Codes (LOINC) Committee and is available at no cost under the license at http://loinc.org/license.

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