Evidence-Based Supplement & Herb Guides

IgA Blood Test: High, Low, Normal Range, Celiac Disease, and Immune Meaning

Learn how to interpret an IgA blood test, including age-specific normal ranges, causes of high or low IgA, selective IgA deficiency, and its effect on celiac disease testing.

An IgA blood test measures immunoglobulin A, an antibody that helps protect surfaces exposed to the outside world, especially the respiratory and digestive tracts....

Immunoglobulin Blood Test: IgG, IgA, IgM, High and Low Levels, and Immune Function

Understand IgG, IgA, and IgM blood test results, including normal ranges, causes of high or low levels, immune deficiency patterns, and polyclonal versus monoclonal increases.

An immunoglobulin blood test measures the main antibody classes in serum—usually IgG, IgA, and IgM—to look for patterns of low antibody production or excessive...

Myositis Autoantibody Panel: Muscle Inflammation Antibodies, Lung Disease Risk, and Diagnosis

Learn how a myositis autoantibody panel identifies muscle-disease phenotypes, lung-risk antibodies, necrotizing myopathy markers, cancer associations, and next diagnostic steps.

A myositis autoantibody panel looks for immune proteins associated with inflammatory muscle diseases and related syndromes. The result can help connect a pattern of...

Paraneoplastic Autoantibody Panel: Cancer-Related Immune Antibodies, Neurologic Symptoms, and Meaning

Understand paraneoplastic autoantibody panels, including high-risk neural antibodies, neurologic syndromes, cancer associations, serum versus CSF testing, and follow-up after positive or negative results.

A paraneoplastic autoantibody panel tests for immune markers associated with neurologic syndromes that can arise when an antitumor immune response also targets the nervous...

Rheumatoid Factor (RF) Test: Positive, Negative, High Levels, and Rheumatoid Arthritis Meaning

Understand rheumatoid factor test results, including normal ranges, low and high positive RF, non-RA causes, seronegative rheumatoid arthritis, anti-CCP testing, and next diagnostic steps.

A rheumatoid factor test measures an autoantibody that can support the diagnosis of rheumatoid arthritis when inflammatory joint symptoms are present. Most clinical assays...

Systemic Autoimmune Rheumatic Disease (SARD) Panel: ANA, ENA, Autoantibodies, and Diagnosis

Understand SARD panels, including ANA methods, titers and patterns, ENA reflex antibodies, lupus, Sjögren and scleroderma associations, false positives, negative results, and organ-based follow-up.

A systemic autoimmune rheumatic disease panel combines antinuclear antibody screening with selected disease-associated autoantibodies to help evaluate lupus, Sjögren disease, systemic sclerosis, mixed connective...

Thyroid Antibody Panel: TPOAb, TgAb, TRAb, Hashimoto, Graves, and Autoimmune Thyroid Disease

Understand TPOAb, TgAb, TRAb and TSI results, including Hashimoto and Graves patterns, normal thyroid function with positive antibodies, pregnancy risks, monitoring, and treatment meaning.

A thyroid antibody panel helps determine whether an overactive or underactive thyroid has an autoimmune cause. The main tests are thyroid peroxidase antibodies (TPOAb),...

Tissue Transglutaminase (tTG-IgA) Test: Celiac Disease Screening, Positive Result, and Meaning

Learn what a tTG-IgA test screens for, how to interpret negative, borderline, and positive celiac results, and why total IgA, gluten intake, and biopsy matter.

The tissue transglutaminase IgA test, usually shortened to tTG-IgA, is the main blood test used to screen for celiac disease. It detects an autoimmune...

Anticardiolipin IgA Antibody Test: Antiphospholipid Antibodies and APS Risk

Learn how the anticardiolipin IgA antibody test is interpreted, why IgA is not an APS criteria marker, and what a positive result may mean for clotting and pregnancy risk.

The anticardiolipin IgA antibody test measures IgA-class antibodies that react with cardiolipin-associated antigen complexes. It is sometimes added when a person has thrombosis, pregnancy...

Anticardiolipin IgG Antibody Test: Clotting Risk, Pregnancy Loss, and APS Meaning

Learn how anticardiolipin IgG levels are interpreted, why persistent moderate or high results matter, and how the test relates to APS, clotting, and pregnancy loss.

The anticardiolipin IgG antibody test measures IgG autoantibodies that bind cardiolipin-associated targets in the blood. It is one of the main laboratory tests used...

Anticardiolipin IgM Antibody Test: Clotting Risk, Pregnancy Loss, and APS Meaning

Learn how anticardiolipin IgM results are interpreted, why low values may be temporary, and when persistent IgM may matter for APS, clotting, and pregnancy loss.

The anticardiolipin IgM antibody test detects IgM-class antibodies that react with cardiolipin-associated targets. It is one of the accepted laboratory tests used in antiphospholipid...

Anti-Phosphatidylethanolamine Antibody Test: Antiphospholipid Marker and Pregnancy Loss Risk

Learn what an anti-phosphatidylethanolamine antibody test measures, how a positive aPE result relates to pregnancy loss, and why it does not diagnose APS alone.

The anti-phosphatidylethanolamine antibody test looks for immune proteins that react with phosphatidylethanolamine, a phospholipid found in cell membranes and platelet-related structures. These antibodies, often...

Anti-Phosphatidylserine Antibody Test: APS Marker, Positive Result, and Meaning

Understand what an anti-phosphatidylserine antibody test measures, how positive and borderline results are interpreted, and why the marker does not diagnose APS alone.

An anti-phosphatidylserine antibody test detects autoantibodies that react with phosphatidylserine, a membrane phospholipid that becomes exposed when cells are activated, injured, or undergoing programmed...

Antiphospholipid Antibody Repeat Testing: 12-Week Confirmation and APS Diagnosis

Learn why antiphospholipid antibodies are repeated after at least 12 weeks, which tests need confirmation, and how anticoagulants affect APS diagnosis.

Antiphospholipid antibody repeat testing is used to determine whether an abnormal result is persistent rather than temporary. For antiphospholipid syndrome assessment, a criteria antibody...

Antiphospholipid IgA Antibody Panel: Antiphospholipid Antibodies, APS Risk, and Meaning

Learn what an antiphospholipid IgA antibody panel measures, how positive results differ from standard APS markers, and what they may mean for clotting and pregnancy risk.

An antiphospholipid IgA antibody panel looks for immunoglobulin A antibodies directed against phospholipid-related targets, most often cardiolipin and beta-2 glycoprotein I. These tests can...

Antiphospholipid IgG Antibody Panel: Clotting Risk, APS Diagnosis, and Meaning

Understand what an antiphospholipid IgG antibody panel includes, how levels and persistent results affect APS diagnosis, and what a positive test may mean for clotting risk.

An antiphospholipid IgG antibody panel checks for IgG autoantibodies that recognize phospholipid-binding proteins or related targets. The most important components are anticardiolipin IgG and...

Antiphospholipid IgM Antibody Panel: Clotting Risk, APS Diagnosis, and Meaning

Learn how an antiphospholipid IgM antibody panel is interpreted, when isolated or persistent IgM may matter, and how results relate to clotting risk and APS diagnosis.

An antiphospholipid IgM antibody panel measures IgM antibodies against phospholipid-related targets, usually anticardiolipin and beta-2 glycoprotein I. These results can help evaluate antiphospholipid syndrome...

Antiphospholipid Syndrome Blood Test Panel: Lupus Anticoagulant, Anticardiolipin, Beta-2 Glycoprotein, and APS Diagnosis

Learn what an APS blood test panel includes, how lupus anticoagulant, anticardiolipin, and beta-2 glycoprotein results are combined, and how testing supports diagnosis.

An antiphospholipid syndrome blood test panel combines three established marker groups: lupus anticoagulant, anticardiolipin antibodies, and anti-beta-2 glycoprotein I antibodies. Together, these tests help...

Anti-Prothrombin Antibody Test: Antiphospholipid Syndrome, Clotting Risk, and Meaning

Learn what an anti-prothrombin antibody test measures, how it differs from aPS/PT testing, and what a positive result may mean for APS and clotting risk.

The anti-prothrombin antibody test looks for autoantibodies that recognize prothrombin, also called coagulation factor II. Prothrombin is a normal blood protein that the body...

APS Monitoring Blood Test Panel: Antibodies, Clotting Risk, Pregnancy Risk, and Follow-Up

Learn which blood tests and clinical checks are used to monitor APS, including antibodies, INR, heparin safety, clotting risk, pregnancy surveillance, and follow-up timing.

APS monitoring is not one fixed blood panel repeated at every visit. Follow-up for antiphospholipid syndrome usually combines medication-specific tests, blood counts, kidney and...