Complete Testing & Optimization Guide
Optimal ranges, provider comparison, and strategies to improve your Rheumatoid Factor (RF) levels
Only 1 providers include this test
Autoimmune Markers
<14 IU/mL, Weakly positive:14-40 IU/mL, Positive:>40 IU/mL
Abnormal Rheumatoid Factor (RF) levels can indicate underlying health issues that may go undetected without proper testing. Regular monitoring helps catch problems early when they're most treatable.
Understanding your Rheumatoid Factor (RF) levels enables targeted interventions, tracks treatment effectiveness, and helps optimize your overall health and performance.
Antibody associated with rheumatoid arthritis
Elevated in 70-80% of rheumatoid arthritis cases. Also positive in other autoimmune diseases. Used for diagnosis and prognosis.
<14 IU/mL, Weakly positive:14-40 IU/mL, Positive:>40 IU/mL
| Provider | Includes Test | Annual Cost | Total Biomarkers |
|---|---|---|---|
 Superpower | — | $199 | 100+ |
 WHOOP Advanced Labs | — | $349 | 65 |
 Labcorp OnDemand | — | $398 | 30+ |
| — | $486 | 40+ | |
| — | $468 | 83 | |
| — | $798 | 100+ | |
 InsideTracker | — | $680 | 48 |
 Function Health | ✓ | $499 | 100+ |
| — | $900 | 70+ | |
| — | $1150 | 110 | |
| — | $Varies | 75+ |
Choose from 1 providers that include this biomarker in their panels
Rheumatoid Factor (RF) is a autoimmune markers biomarker that Antibody associated with rheumatoid arthritis The normal reference range is <14 IU/mL, Weakly positive:14-40 IU/mL, Positive:>40 IU/mL. Regular testing helps track changes and identify potential health issues early.
1 out of 10 major blood testing providers include Rheumatoid Factor (RF) in their standard panels. These include Function.
For most people, testing Rheumatoid Factor (RF) 2-4 times per year is recommended to establish baseline levels and track trends. If you have abnormal results or are actively working to optimize this biomarker, more frequent testing (quarterly) may be beneficial. Always consult with your healthcare provider for personalized testing frequency recommendations.
The standard laboratory reference range for Rheumatoid Factor (RF) is <14 IU/mL, Weakly positive:14-40 IU/mL, Positive:>40 IU/mL. However, many functional medicine practitioners recommend tighter "optimal" ranges for peak health and performance. Your ideal range may vary based on your age, sex, health goals, and other individual factors. Work with a healthcare provider familiar with optimal ranges to determine your target levels.
Most direct-to-consumer blood testing services that include Rheumatoid Factor (RF) provide the physician order as part of their service. However, some states have restrictions on direct-to-consumer testing. Check with your chosen provider about availability in your state and whether they provide the necessary physician authorization.
Elevated in 70-80% of rheumatoid arthritis cases. Also positive in other autoimmune diseases. Used for diagnosis and prognosis.
This information is for educational purposes only and is not medical advice. Always consult with a qualified healthcare provider about your specific health needs and before making decisions about blood testing.
