An **Anti-Jo-1 Antibodies by EIA (Enzyme Immunoassay)** test is a specialized blood analysis used to diagnose autoimmune muscle diseases. It primarily screens for **Anti-Jo-1**, an autoantibody targeting the histidyl-tRNA synthetase enzyme.
This test is the primary marker for **Antisynthetase Syndrome**, a condition characterized by myositis (muscle inflammation), interstitial lung disease, arthritis, and "mechanic's hands" (rough, cracked skin on the fingertips).
Using the EIA method, the lab measures the concentration of these antibodies in the blood.

An **Anti-La/SSB-IgG Antibodies by EIA (Enzyme Immunoassay)** test is a targeted blood assay used to diagnose systemic autoimmune conditions. It specifically detects IgG autoantibodies directed against the **La/SSB** (Sjögren's syndrome type B) cellular antigen, which is involved in RNA processing.
This test is primarily utilized to confirm a diagnosis of **Sjögren’s syndrome**—an autoimmune disorder marked by dry eyes and dry mouth—where it often presents alongside Anti-Ro/SSA antibodies. It is also an important diagnostic marker for **Systemic Lupus Erythematosus (SLE)** and helps evaluate the risk of neonatal lupus in pregnant individuals.

An **Anti-Microsomal Antibodies** test is a diagnostic blood assay primarily used to detect and manage autoimmune thyroid disorders. These antibodies target thyroid microsomal antigens, which are now recognized as the enzyme **thyroid peroxidase (TPO)**. Consequently, this test is widely known as the **Anti-TPO antibody test**.
Elevated levels of anti-microsomal antibodies are a classic hallmark of **Hashimoto’s thyroiditis** (autoimmune hypothyroidism) and are also frequently elevated in **Graves' disease** (autoimmune hyperthyroidism). Measuring these antibodies helps clinicians confirm an autoimmune origin for thyroid dysfunction, predict the progression of subclinical hypothyroidism, and evaluate postpartum thyroiditis risks.