Joint pain has many possible causes, from injury to autoimmune disease. Blood tests cannot diagnose arthritis on their own, but they can surface inflammatory and nutrient markers that point to particular avenues worth investigating.
Inflammation markers
C-reactive protein (CRP) is the most widely used inflammation marker. Elevated CRP suggests inflammation somewhere in the body, which is useful information when investigating joint pain. ESR (erythrocyte sedimentation rate) is sometimes tested alongside.
Rheumatoid factor and ANA
Rheumatoid factor and anti-nuclear antibody testing are part of rheumatology panels and can flag autoimmune activity. A positive result is not diagnostic on its own and needs interpretation by a rheumatologist.
Vitamin D and bone health
Low vitamin D is linked to widespread musculoskeletal pain. Adequate vitamin D supports muscle function and bone health. Many people in the UK with chronic joint pain are vitamin D deficient, particularly through winter.
What blood tests will not show
Mechanical joint problems (cartilage wear, ligament damage, gout crystals in joints) need imaging or aspiration to diagnose. Blood tests are one input among several. Chxhealth is a biomarker and genetic data provider. We do not diagnose, treat or prescribe. Our service supports your wellbeing journey alongside your healthcare professional.
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Frequently asked questions
Can a blood test diagnose rheumatoid arthritis?
No. Chxhealth is a biomarker and genetic data provider. We do not diagnose, treat or prescribe. Our service supports your wellbeing journey alongside your healthcare professional. Rheumatoid factor and anti-CCP results contribute to a diagnosis but must be interpreted by a rheumatologist alongside clinical examination and imaging.
Why test vitamin D if my joints hurt?
Vitamin D deficiency is associated with diffuse musculoskeletal pain. It is also common in the UK in winter, easy to address, and worth ruling out.
About this article. Educational content. Chxhealth is a biomarker and genetic data provider. We do not diagnose, treat or prescribe. Our service supports your wellbeing journey alongside your healthcare professional. For medical advice about your health or results, please speak to a qualified clinician.
