Evidence-Based Supplement & Herb Guides

Maturity-Onset Diabetes of the Young (MODY) Genetic Test: Monogenic Diabetes Genes, Diagnosis, and Results

Learn when MODY genetic testing is appropriate, how GCK, HNF1A, HNF4A, and HNF1B results are interpreted, and how a diagnosis can change diabetes treatment and family care.

A MODY genetic test looks for a disease-causing variant in one gene that disrupts insulin production or glucose sensing. The most common clinically important...

Mitochondrial Diabetes Genetic Test: mtDNA Variants and Results

Understand how mitochondrial diabetes genetic testing detects mtDNA variants such as m.3243A>G, why urine testing may be needed, and how results affect diabetes and family care.

A mitochondrial diabetes genetic test looks for disease-causing variants in mitochondrial DNA, most often the m.3243A>G variant in the MT-TL1 gene. This form of...

Mitochondrial Disease Genetic Test: mtDNA, Nuclear Genes, and Results

Learn how mitochondrial disease genetic testing evaluates mtDNA and nuclear genes, why tissue and heteroplasmy matter, and how positive, uncertain, and negative results are interpreted.

A mitochondrial disease genetic test looks for pathogenic variants in two separate genetic systems: the small mitochondrial genome and the much larger nuclear genome....

Monogenic Obesity Genetic Test: MC4R, LEP, LEPR, POMC, and Results

Learn how monogenic obesity testing for MC4R, LEP, LEPR, POMC, and related genes works, what results mean, and when findings may guide treatment.

Severe obesity that begins in infancy or early childhood can occasionally result from a pathogenic change in a single gene controlling hunger, satiety, energy...

MTHFR Genetic Test: C677T, A1298C, Homocysteine, and Clinical Meaning

Understand MTHFR C677T and A1298C results, their relationship to homocysteine and folic acid, and why common variants rarely change clot or pregnancy care.

MTHFR testing commonly reports two widespread gene variants, C677T and A1298C. These variants can modestly change activity of the methylenetetrahydrofolate reductase enzyme, which participates...

Neonatal Diabetes Genetic Test: KCNJ11, ABCC8, INS, and Results

Learn when neonatal diabetes genetic testing for KCNJ11, ABCC8, INS, 6q24, and other causes can change treatment, prognosis, and family care.

Diabetes diagnosed during the first six months of life is rarely autoimmune type 1 diabetes. It is usually monogenic, meaning a change in one...

PCSK9 Genetic Test: Cholesterol, Heart Disease Risk, and Results

Learn how PCSK9 gain- and loss-of-function variants affect LDL cholesterol, familial hypercholesterolemia, heart risk, treatment, and family testing.

PCSK9 genetic testing can help explain unusually high or unusually low low-density lipoprotein cholesterol, but the direction of effect matters. Rare gain-of-function variants increase...

Polygenic Risk Score (PRS) for Coronary Artery Disease: Heart Attack Risk and Results

Understand how a coronary artery disease polygenic risk score estimates heart attack susceptibility, what percentiles mean, and how results fit with clinical prevention.

A coronary artery disease polygenic risk score estimates inherited susceptibility by combining effects from hundreds, thousands, or millions of common DNA variants. Unlike a...

Polygenic Risk Score (PRS) for Obesity: Genetic Risk, BMI, and Results

Learn what an obesity polygenic risk score can reveal about inherited BMI susceptibility, childhood trajectories, ancestry limits, and clinical interpretation.

An obesity polygenic risk score combines many common DNA variants to estimate inherited tendency toward higher body mass index or obesity. It can reveal...

Polygenic Risk Score (PRS) for Type 2 Diabetes: Genetic Risk and Results

Understand how a type 2 diabetes polygenic risk score estimates inherited susceptibility, what results mean, and how genetics fits with screening and prevention.

A type 2 diabetes polygenic risk score summarizes the small effects of many common genetic variants into an estimate of inherited susceptibility. It can...

Prothrombin G20210A Genetic Test: Blood Clot Risk and Results

Learn what a prothrombin G20210A result means for venous blood clot risk, anticoagulation, pregnancy, hormones, surgery, and family testing.

The prothrombin G20210A genetic test detects a specific variant in F2, the gene encoding coagulation factor II. The variant can increase prothrombin production and...

Restrictive Cardiomyopathy Genetic Test: Heart Muscle Genes and Results

Learn how restrictive cardiomyopathy genetic testing evaluates heart-muscle genes, distinguishes inherited disease from mimics, and guides result interpretation and family care.

Restrictive cardiomyopathy is an uncommon heart-muscle disorder in which one or both ventricles become unusually stiff and cannot fill normally, even when pumping strength...

Short QT Syndrome Genetic Test: Heart Rhythm Genes and Results

Understand how short QT syndrome genetic testing evaluates heart rhythm genes, why ECG context and gene validity matter, and what positive, uncertain, or negative results mean.

Short QT syndrome is a very rare inherited electrical disorder in which the heart’s recovery time between beats is abnormally brief, creating vulnerability to...

Thoracic Aortic Aneurysm Genetic Test: FBN1, TGFBR1, TGFBR2, and Results

Learn how thoracic aortic aneurysm genetic testing evaluates FBN1, TGFBR1, TGFBR2, and other HTAD genes and how results guide imaging, surgery, and family care.

A thoracic aortic aneurysm develops when part of the aorta within the chest enlarges and its wall becomes vulnerable to tearing or rupture. Genetic...

Thrombophilia Genetic Test: Factor V Leiden, Prothrombin G20210A, and Results

Learn when thrombophilia genetic testing for factor V Leiden and prothrombin G20210A is useful, how other clotting tests differ, and what results mean for care.

A thrombophilia genetic test looks for inherited changes that increase susceptibility to venous blood clots, most commonly factor V Leiden in F5 and prothrombin...

Vascular Ehlers-Danlos Syndrome Genetic Test: COL3A1 Gene and Results

Learn how COL3A1 genetic testing confirms vascular Ehlers-Danlos syndrome, how variant types affect interpretation, and how results guide surveillance, emergencies, and family care.

Vascular Ehlers-Danlos syndrome, or vEDS, is a rare inherited connective-tissue disorder marked by fragility of arteries, bowel, uterus, skin, and other tissues. A clinical-grade...

Wilson Disease Genetic Test: ATP7B, Copper Metabolism, and Results

Learn how ATP7B genetic testing fits into Wilson disease diagnosis, how copper tests and variant results are interpreted, and how treatment and family screening prevent injury.

Wilson disease is a treatable inherited disorder in which impaired ATP7B function prevents normal handling and biliary excretion of copper. Copper first accumulates in...

ALK Mutation Test: Lung Cancer, Targeted Therapy, and Results

Understand what an ALK mutation test detects in lung cancer, how tissue and liquid biopsy results are interpreted, and how ALK-positive findings guide targeted therapy.

An ALK mutation test looks for an abnormal change involving the ALK gene in cancer cells. In lung cancer, the important finding is usually...

APC Genetic Test: Familial Adenomatous Polyposis, Colon Cancer Risk, and Results

Learn what an APC genetic test can show, how positive, negative, and uncertain results are interpreted, and how FAP findings guide colon surveillance, surgery, and family testing.

An APC genetic test looks for inherited harmful variants in the APC gene, the main cause of familial adenomatous polyposis. Familial adenomatous polyposis, or...

ASXL1 Mutation Test: Blood Cancer, Myeloid Neoplasm, and Results

Understand what an ASXL1 mutation test shows in blood and bone marrow, how results relate to myeloid neoplasms and clonal hematopoiesis, and how they affect prognosis and follow-up.

An ASXL1 mutation test looks for acquired changes in the ASXL1 gene in blood or bone marrow cells. ASXL1 variants are found in several...