Autoimmune & Inflammatory Testing

Targeted Investigation of Inflammation and Autoimmune Disease

Autoimmune conditions occur when the immune system reacts against the body’s own tissues. They can affect almost any part of the body, producing symptoms involving the joints, skin, muscles, gastrointestinal system, nervous system, blood or other organs.

Blood tests can contribute valuable information when an autoimmune or inflammatory condition is suspected, but there is no single blood test that screens reliably for every autoimmune disease. Some antibodies can also be detected in healthy people, meaning broad testing without an appropriate clinical reason can produce confusing or misleading results.

YT Medical therefore offers Autoimmune & Inflammatory Testing as a targeted pathway based on symptoms, history and the condition being considered.

General Inflammatory Markers

Initial testing may include C-Reactive Protein (CRP) and Erythrocyte Sedimentation Rate (ESR).

CRP is a protein that can rise relatively quickly in response to inflammation. ESR is another non-specific marker influenced by inflammatory processes as well as factors such as age and anaemia.

Neither test identifies the cause or location of inflammation. Raised results can occur with infection, autoimmune disease and numerous other conditions, while normal CRP or ESR results do not exclude all inflammatory or autoimmune disorders.

A Full Blood Count may also be useful because autoimmune and inflammatory disease can sometimes be associated with anaemia or changes in white blood cells or platelets.

ANA and Connective Tissue Disease Testing

Antinuclear Antibody (ANA) testing may be considered where symptoms suggest an autoimmune connective-tissue disorder. A positive ANA can occur in conditions such as systemic lupus erythematosus, but positive results also occur in some healthy individuals.

For this reason, ANA is most useful when there is a clinical reason to suspect autoimmune disease rather than as a routine health-screening test.

Where ANA findings and symptoms warrant further investigation, more specific testing may include an Extractable Nuclear Antigen (ENA) profile, which can contain antibodies associated with particular connective-tissue conditions, and Anti-double-stranded DNA (Anti-dsDNA) antibodies where lupus is being considered.

Complement proteins such as C3 and C4 may also be measured within selected autoimmune investigations.

Rheumatoid Arthritis Testing

Where inflammatory arthritis is suspected, testing may include Rheumatoid Factor (RF) and Anti-Cyclic Citrullinated Peptide (Anti-CCP) antibodies, alongside CRP, ESR and a Full Blood Count.

Rheumatoid Factor can be positive in rheumatoid arthritis but is not specific to the condition and may also be detected in people without rheumatoid arthritis.

Anti-CCP antibodies are more closely associated with rheumatoid arthritis and can provide useful diagnostic and prognostic information. However, neither a negative RF nor a negative Anti-CCP result completely excludes inflammatory arthritis.

Persistent swollen joints, particularly involving several joints or the small joints of the hands and feet, require appropriate clinical assessment and should not be delayed while waiting for private blood testing.

Other Autoimmune Tests

More focused testing may be available where a particular condition is suspected, including selected thyroid antibodies, intrinsic-factor antibodies and other disease-specific autoantibodies.

For example, thyroid antibody testing can help clarify an autoimmune cause of thyroid dysfunction in selected circumstances, while Intrinsic Factor Antibodies may be considered when autoimmune gastritis is suspected as a cause of Vitamin B12 deficiency.

More specialist antibodies should generally be selected according to a specific clinical question rather than included routinely.

Understanding Positive Results

A positive autoimmune antibody does not necessarily mean that somebody has an autoimmune disease. Results must be interpreted alongside symptoms, physical findings, other laboratory markers and, where necessary, imaging or specialist investigation.

Likewise, a patient with convincing symptoms can still require rheumatology or another specialist assessment despite negative blood results.

YT Medical’s role is to provide access to appropriate laboratory testing and identify where further medical investigation is required rather than diagnose complex autoimmune conditions from a blood panel alone.