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Understand the 1-mg low-dose dexamethasone suppression test, the common cortisol cutoff of 1.8 mcg/dL, causes of nonsuppression, and the follow-up used for Cushing screening.

Low-Dose Dexamethasone Suppression Test: Cushing Syndrome Screening and Results

Learn how an 8–9 a.m. cortisol test screens for adrenal insufficiency, what low and intermediate results mean, how ACTH helps identify the cause, and when stimulation testing is needed.

Morning Cortisol Test: Low Levels, Adrenal Insufficiency, and Results

Learn how a pheochromocytoma and paraganglioma panel uses plasma or urine metanephrines, normetanephrine, catecholamines, and controlled collection to interpret abnormal results.

Pheochromocytoma and Paraganglioma Test Panel: Metanephrines, Normetanephrine, Catecholamines, and Results

Learn what plasma epinephrine, norepinephrine, and dopamine results mean, why collection posture matters, common causes of high values, and when metanephrine testing is preferred.

Plasma Catecholamines Test: Epinephrine, Norepinephrine, Dopamine, and Results

Learn how plasma free metanephrine and normetanephrine testing screens for pheochromocytoma and paraganglioma, why supine rest matters, and how high or borderline results are evaluated.

Plasma Free Metanephrines Test: Pheochromocytoma and Paraganglioma Screening, High Levels, and Results

Learn what a high plasma normetanephrine result means, why supine rest matters, common false-positive causes, when clonidine testing is used, and how PPGL evaluation proceeds.

Plasma Normetanephrine Test: High Levels, Pheochromocytoma Screening, and Results

Diagnostics

Home Diagnostics Page 14

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

HNF1A 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.

HNF4A MODY Genetic Test: Diabetes Diagnosis, Treatment, 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.

Hypertrophic Cardiomyopathy Genetic Test: MYH7, MYBPC3, 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.

LDLR Genetic Test: Familial Hypercholesterolemia Risk 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.

Loeys-Dietz Syndrome Genetic Test: TGFBR1, TGFBR2, SMAD3, 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.

Long QT Syndrome Genetic Test: KCNQ1, KCNH2, SCN5A, 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.

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

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

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.

Mitochondrial Diabetes Genetic Test: mtDNA Variants 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.

Mitochondrial Disease Genetic Test: mtDNA, Nuclear Genes, 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.

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

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

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

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

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

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

PCSK9 Genetic Test: Cholesterol, Heart Disease 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.

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

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

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

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

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

Prothrombin G20210A Genetic Test: Blood Clot Risk 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 Genetic Test: Heart Muscle 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 Genetic Test: Heart Rhythm Genes and Results

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