Evidence-Based Supplement & Herb Guides

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...

Beta-2 Glycoprotein 1 IgA Antibody Test: APS Risk and Antiphospholipid Antibodies

Learn what a beta-2 glycoprotein 1 IgA antibody result means, why it is a non-criteria APS marker, and how isolated or persistent positivity may relate to clot risk.

The beta-2 glycoprotein 1 IgA antibody test detects IgA autoantibodies against beta-2 glycoprotein I, a blood protein involved in many clinically important antiphospholipid antibody...

Beta-2 Glycoprotein 1 IgG Antibody Test: APS, Clotting Risk, and Pregnancy Loss

Learn how beta-2 glycoprotein 1 IgG testing supports APS diagnosis, how levels and persistent results affect clot risk, and what the test may mean after pregnancy loss.

The beta-2 glycoprotein 1 IgG antibody test measures IgG autoantibodies against beta-2 glycoprotein I, a major target in antiphospholipid syndrome (APS). It is one...

Beta-2 Glycoprotein 1 IgM Antibody Test: APS, Clotting Risk, and Pregnancy Loss

Understand what a beta-2 glycoprotein 1 IgM antibody result means, how it relates to APS, clotting and pregnancy loss, and why repeat testing matters.

The beta-2 glycoprotein 1 IgM antibody test looks for an autoimmune antibody linked to antiphospholipid syndrome, or APS. APS can raise the risk of...

Dilute Russell Viper Venom Time (dRVVT) Test: Lupus Anticoagulant Screening and Confirmation

Learn how the dRVVT test screens for lupus anticoagulant, how screen-mix-confirm results are interpreted, and why anticoagulants can distort the result.

The dilute Russell viper venom time, usually shortened to dRVVT, is one of the main laboratory methods used to detect lupus anticoagulant. Despite its...

Hexagonal Phospholipid Neutralization Test: Lupus Anticoagulant Confirmation and Meaning

Learn how the hexagonal phospholipid neutralization test confirms lupus anticoagulant, what the delta clotting time means, and which drugs can interfere.

The hexagonal phospholipid neutralization test is an aPTT-based method used to confirm that a prolonged clotting time is caused by a phospholipid-dependent inhibitor, most...

Lupus Anticoagulant Reflex Panel: Screening, Mixing Study, Confirmation, and Interpretation

Understand how a lupus anticoagulant reflex panel uses screening, mixing, and confirmation tests, how to read the report, and why medication can interfere.

A lupus anticoagulant reflex panel is a stepwise group of clotting tests designed to determine whether a phospholipid-dependent inhibitor is present. The laboratory starts...

Lupus Anticoagulant Test: Positive, Negative, Clotting Risk, and APS Meaning

Learn what positive, negative, and indeterminate lupus anticoagulant tests mean, how they relate to clotting risk and APS, and why repeat testing matters.

A lupus anticoagulant test looks for an antibody effect that slows phospholipid-dependent clotting reactions in the laboratory. The name is confusing: the antibody can...

Phosphatidylserine-Prothrombin Antibody Test: APS Risk, Clotting Risk, and Meaning

Learn what a phosphatidylserine-prothrombin antibody test measures, how IgG and IgM results relate to APS and clotting risk, and why context and repeat testing matter.

The phosphatidylserine-prothrombin antibody test looks for immune proteins that bind to a complex formed by phosphatidylserine and prothrombin. These antibodies, usually reported as aPS/PT...

PTT-LA Test: Lupus Anticoagulant Screening, Prolonged Clotting Time, and Meaning

Understand what the PTT-LA test screens for, why a prolonged result is not diagnostic, how mixing and confirmation work, and what the result may mean for lupus anticoagulant and APS.

The PTT-LA test is an activated partial thromboplastin time designed to be sensitive to lupus anticoagulant. It measures how long plasma takes to clot...

Recurrent Pregnancy Loss Antiphospholipid Panel: APS Markers, Miscarriage Risk, and Meaning

Learn which APS markers are included in recurrent pregnancy loss testing, how positive and negative patterns are interpreted, why 12-week confirmation matters, and how results may guide a future pregnancy.

A recurrent pregnancy loss antiphospholipid panel checks for antibodies associated with obstetric antiphospholipid syndrome (APS), an acquired autoimmune condition that can contribute to miscarriage,...

Seronegative Antiphospholipid Syndrome Test Panel: Non-Criteria Antibodies and APS-Like Symptoms

Learn what a seronegative APS test panel may include, why non-criteria antibodies require cautious interpretation, and how specialists evaluate APS-like symptoms when standard markers are negative.

Seronegative antiphospholipid syndrome is a proposed diagnosis for people with thrombosis, pregnancy morbidity, or other strongly APS-like features who repeatedly test negative for the...

Thrombosis Antiphospholipid Panel: Clotting Risk, APS Markers, and Meaning

Learn what a thrombosis antiphospholipid panel measures, when APS testing is useful after a clot, how anticoagulants affect results, and what single, double, or triple positivity may mean.

A thrombosis antiphospholipid panel looks for the persistent autoimmune markers that support antiphospholipid syndrome (APS) in a person with a confirmed blood clot. The...

Triple-Positive Antiphospholipid Antibody Panel: High-Risk APS, Clotting Risk, and Meaning

A triple-positive antiphospholipid antibody panel means that all three standard APS laboratory categories are positive: lupus anticoagulant, anticardiolipin antibodies, and anti-beta-2 glycoprotein I antibodies....

Acute Tryptase Test: Anaphylaxis, Mast Cell Activation, Timing, and Interpretation

Learn when to draw an acute tryptase test, how to compare it with baseline using the 20% plus 2 rule, and why a normal result does not exclude anaphylaxis.

An acute tryptase test is a time-sensitive blood test used to look for evidence that mast cells released their contents during a suspected anaphylactic...

Allergy Blood Test Panel: Total IgE, Specific IgE, Allergen Triggers, and Meaning

Understand what an allergy blood test panel measures, how total and specific IgE differ, why positive results may not equal allergy, and when focused follow-up is needed.

An allergy blood test panel measures immunoglobulin E antibodies in a blood sample. Depending on the order, it may include total IgE, specific IgE...

Alpha-Gal IgE Test: Red Meat Allergy, Tick Bite, Delayed Reaction, and Meaning

Learn how the alpha-gal IgE test helps diagnose delayed red-meat allergy after tick bites, what positive and negative results mean, and how to manage exposure safely.

The alpha-gal IgE test is a blood test used to help diagnose alpha-gal syndrome, an allergy linked to tick bites and reactions to a...

Baseline Tryptase Test: Mastocytosis, Mast Cell Burden, Hereditary Alpha-Tryptasemia, and Meaning

Learn how a baseline tryptase test is collected and interpreted, including reference ranges, hereditary alpha-tryptasemia, mastocytosis criteria, and appropriate follow-up.

A baseline tryptase test measures the stable amount of tryptase circulating when a person is well and at least 24 hours beyond a suspected...

Basophil Activation Test: Allergy Testing, CD63, CD203c, and Reaction Risk

Learn how the basophil activation test uses CD63 and CD203c to assess functional allergy, how results are interpreted, and why BAT cannot precisely predict future reaction severity.

The basophil activation test, or BAT, is a specialized blood test that exposes a patient’s living basophils to a suspected allergen in the laboratory....