Lab Tests for Rheumatoid Arthritis
Rheumatoid arthritis (RA) is a chronic autoimmune disease that causes inflammation in your joints, leading to pain, swelling, stiffness, and potential joint destruction. Lab testing plays a key role in diagnosing RA, monitoring disease activity, and assessing treatment effectiveness. Key markers include rheumatoid factor (RF), inflammatory indicators like CRP and sed rate, and ANA for overlapping autoimmune conditions. JustLabs lets you order these tests online at transparent prices, helping you stay on top of your RA monitoring without extra doctor visits.
Recommended Tests
Understanding Your Results
| Test | Normal Range | Low Means | High Means |
|---|---|---|---|
| Rheumatoid Factor | <14 IU/mL | Seronegative RA possible | Seropositive RA — supports diagnosis |
| ANA | Negative (<1:40) | Overlap autoimmune conditions less likely | May indicate overlap with lupus or Sjögren's |
| hs-CRP | <1.0 mg/L | Low disease activity | Active inflammation — possible flare |
| Sed Rate | M: 0–22; F: 0–29 mm/hr | Minimal systemic inflammation | Active RA inflammation |
How to Order
Order Online
Select your tests and pay securely. A licensed physician authorizes your order.
Visit Quest Diagnostics
Walk into any of 2,200+ Quest locations nationwide. No appointment needed.
Get Results
Results available in your account within 1-2 business days.
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Content reviewed for accuracy by the JustLabs editorial team.