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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 13

Learn what a variant of uncertain significance means, why VUS results occur, what they should not change, how reclassification works, and what to ask next.

Variant of Uncertain Significance (VUS): Genetic Test Results and Meaning

Understand whole-exome sequencing, who may benefit, how trio analysis works, what positive and negative results mean, and why reanalysis can find answers later.

Whole-Exome Sequencing (WES) Test: Genetic Diagnosis, Variants, and Results

Understand what whole-genome sequencing tests, what positive, negative, and uncertain WGS results mean, its limitations, disease-risk findings, privacy issues, and next steps.

Whole-Genome Sequencing (WGS) Test: DNA Variants, Disease Risk, and Results

Learn how X-linked genetic tests identify variants, how inheritance and carrier risk work, what positive, negative, and VUS results mean, and which follow-up steps matter.

X-Linked Genetic Test: Inheritance Pattern, Carrier Risk, and Results

Learn how SERPINA1 genetic testing, AAT blood levels, and protein phenotyping diagnose alpha-1 antitrypsin deficiency and guide lung, liver, and family follow-up.

Alpha-1 Antitrypsin Deficiency Genetic Test: SERPINA1, Liver, Lung, and Results

Understand how APOB genetic testing can identify LDL-raising familial hypercholesterolemia or LDL-lowering hypobetalipoproteinemia and how results guide treatment and family screening.

APOB Genetic Test: High LDL Cholesterol, Heart Risk, and Results

Understand APOE ε2, ε3, and ε4 genotype results for cholesterol, late-onset Alzheimer susceptibility, and ARIA risk before anti-amyloid treatment.

APOE Genotype Test: Cholesterol, Alzheimer Disease Risk, and Results

Learn how PKP2, DSP, DSG2, and other arrhythmogenic cardiomyopathy genetic results are interpreted and used for diagnosis, exercise counseling, treatment, and family screening.

Arrhythmogenic Cardiomyopathy Genetic Test: PKP2, DSP, DSG2, and Results

Learn how the SCN5A genetic test supports Brugada syndrome diagnosis, what positive, negative, and uncertain results mean, and how findings guide fever precautions, treatment, and family screening.

Brugada Syndrome Genetic Test: SCN5A Gene, Heart Rhythm Risk, and Results

Understand what a cardiovascular genetic panel tests, who may benefit, how pathogenic and uncertain results are interpreted, and how findings can guide care and family screening.

Cardiovascular Genetic Panel Test: Heart Disease Genes, Risk, and Results

Learn how RYR2 genetic testing supports CPVT diagnosis, what positive, negative, and uncertain results mean, and how findings guide treatment, exercise safety, and family screening.

Catecholaminergic Polymorphic Ventricular Tachycardia (CPVT) Genetic Test: RYR2 and Results

Learn how TTN, LMNA, and MYH7 genetic testing supports dilated cardiomyopathy diagnosis, how results influence rhythm and heart-failure care, and how families are screened.

Dilated Cardiomyopathy Genetic Test: TTN, LMNA, MYH7, 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 Genetic Test: Blood Clot Risk, Mutation, 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.

Familial Atrial Fibrillation Genetic Test: Heart Rhythm Risk 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 Genetic Test: LDLR, APOB, PCSK9, 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 Genetic Test: LMNA, PPARG, 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 Genetic Test: Mild Fasting Hyperglycemia, Diagnosis, 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.

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

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

Hereditary Hemochromatosis Genetic Test: HFE C282Y, H63D, 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.

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

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