Evidence-Based Supplement & Herb Guides

Factor V Leiden Genetic Test: Blood Clot Risk, Mutation, and Results

Learn what the Factor V Leiden genetic test detects, how heterozygous and homozygous results affect venous clot risk, and when findings may influence treatment, pregnancy, estrogen, surgery, and family testing.

Factor V Leiden is a specific inherited change in the F5 gene that increases susceptibility to venous blood clots. It is most strongly associated...

Familial Atrial Fibrillation Genetic Test: Heart Rhythm Risk and Results

Learn when familial and early-onset atrial fibrillation genetic testing may help, how results can reveal cardiomyopathy risk, and why stroke prevention and rhythm treatment remain clinically based.

Atrial fibrillation (AF) is common, especially with aging, high blood pressure, obesity, sleep apnea, valve disease, alcohol exposure, and other acquired factors. In some...

Familial Hypercholesterolemia Genetic Test: LDLR, APOB, PCSK9, and Results

Learn how LDLR, APOB, and PCSK9 genetic testing supports familial hypercholesterolemia diagnosis, what results mean, and how findings guide treatment and cascade screening in adults and children.

Familial hypercholesterolemia (FH) is an inherited disorder in which low-density lipoprotein cholesterol (LDL-C) is elevated from birth, creating decades of exposure that can cause...

Familial Partial Lipodystrophy Genetic Test: LMNA, PPARG, and Results

Learn how LMNA and PPARG genetic testing supports familial partial lipodystrophy diagnosis, how subtypes differ, and how results guide metabolic, liver, cardiac, and family care.

Familial partial lipodystrophy (FPLD) is a group of inherited disorders in which subcutaneous fat is lost from particular body regions while it is preserved...

GCK MODY Genetic Test: Mild Fasting Hyperglycemia, Diagnosis, and Results

Learn how the GCK-MODY genetic test confirms lifelong mild fasting hyperglycemia, why most people need no medication, and how fetal inheritance changes pregnancy management.

GCK-MODY is an inherited form of mild, stable hyperglycemia caused by a change in the glucokinase gene. Glucokinase acts as a glucose sensor in...

Gout Genetic Risk Test: Uric Acid Genes, SLC2A9, ABCG2, and Results

Learn what a gout genetic risk test can reveal about SLC2A9, ABCG2, uric acid handling, polygenic risk, HLA-B*58:01, diagnosis, and treatment.

A gout genetic risk test examines inherited variants that influence serum urate and the likelihood of developing gout. Most tests focus on common variants...

Hereditary Hemochromatosis Genetic Test: HFE C282Y, H63D, and Results

Understand HFE C282Y and H63D genetic test results, penetrance, iron studies, organ assessment, phlebotomy treatment, and family screening for hereditary hemochromatosis.

A hereditary hemochromatosis genetic test looks for variants that can disrupt the body’s regulation of iron absorption. Most first-line tests examine the HFE gene,...

Hereditary Hemorrhagic Telangiectasia Genetic Test: ENG, ACVRL1, SMAD4, and Results

Learn how ENG, ACVRL1, and SMAD4 HHT genetic test results guide diagnosis, AVM screening, bleeding care, anemia treatment, family testing, and SMAD4 surveillance.

A hereditary hemorrhagic telangiectasia genetic test looks for a pathogenic variant that disrupts blood-vessel development and maintenance. HHT, also called Osler-Weber-Rendu syndrome, causes telangiectases...

HNF1A MODY Genetic Test: Diabetes Diagnosis, Treatment, and Results

Understand HNF1A MODY genetic test results, diagnostic clues, sulfonylurea sensitivity, insulin transitions, pregnancy care, complications, and family testing.

An HNF1A MODY genetic test looks for a disease-causing variant in HNF1A, a gene that helps pancreatic beta cells respond to rising glucose and...

HNF4A MODY Genetic Test: Diabetes Diagnosis, Treatment, and Results

Understand HNF4A-MODY genetic testing, who should be tested, how positive and uncertain results are interpreted, and how diagnosis can guide diabetes treatment, pregnancy care, and family screening.

An HNF4A genetic test looks for disease-causing changes in the HNF4A gene, one of the established causes of maturity-onset diabetes of the young, or...

Hypertrophic Cardiomyopathy Genetic Test: MYH7, MYBPC3, and Results

Learn how MYH7, MYBPC3, and other hypertrophic cardiomyopathy genetic test results are interpreted and how they guide family screening, surveillance, and clinical care.

A hypertrophic cardiomyopathy genetic test looks for inherited DNA changes that can cause abnormal thickening of the heart muscle. MYBPC3 and MYH7 are the...

LDLR Genetic Test: Familial Hypercholesterolemia Risk and Results

Understand what an LDLR genetic test can reveal about familial hypercholesterolemia, how results are classified, and how testing can guide early treatment and family screening.

An LDLR genetic test looks for disease-causing variants in the gene that makes the low-density lipoprotein receptor. This receptor removes LDL cholesterol from the...

Loeys-Dietz Syndrome Genetic Test: TGFBR1, TGFBR2, SMAD3, and Results

Learn what a Loeys-Dietz syndrome genetic test checks, how TGFBR1, TGFBR2, and SMAD3 results are interpreted, and how findings affect imaging and family care.

A Loeys-Dietz syndrome genetic test looks for disease-causing variants in genes that regulate transforming growth factor beta signaling, most often TGFBR1, TGFBR2, SMAD3, TGFB2,...

Long QT Syndrome Genetic Test: KCNQ1, KCNH2, SCN5A, and Results

Understand what KCNQ1, KCNH2, and SCN5A genetic test results mean, how they relate to QTc findings, and how long QT syndrome testing guides treatment and family screening.

A long QT syndrome genetic test looks for inherited variants that delay the heart’s electrical recovery after each beat. The three most important genes...

LPA Genetic Test: Lipoprotein(a) [Lp(a)], Heart Risk, and Results

Learn how LPA gene variants influence lipoprotein(a), why a blood Lp(a) test is usually preferred, how results are interpreted, and what high levels mean for heart risk.

An LPA genetic test examines inherited variation in the LPA gene, which strongly influences blood levels of lipoprotein(a), usually written as Lp(a). High Lp(a)...

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...