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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 10

Understand retinitis pigmentosa genetic testing, inherited retinal disease genes, inheritance patterns, syndromic risks, and positive or uncertain results.

Retinitis Pigmentosa Genetic Test: Inherited Eye Disease Genes and Results

Learn how HBB genetic testing distinguishes sickle cell trait from HbSS, HbSC, and sickle beta-thalassemia and clarifies newborn and family results.

Sickle Cell Genetic Test: HBB Gene, Trait, Disease, and Results

Understand SMA carrier testing, including SMN1 copy number, 2+0 silent carriers, duplication markers, residual risk, partner testing, and prenatal results.

Spinal Muscular Atrophy (SMA) Carrier Test: SMN1 Gene, Copy Number, and...

Understand standard carrier screening for cystic fibrosis, SMA, and Fragile X, including test methods, result categories, residual risk, partner testing, and reproductive follow-up.

Standard Carrier Screening Panel: Cystic Fibrosis, SMA, Fragile X, and Results

Learn how ABCA4 genetic testing confirms Stargardt disease, how to interpret two variants, one variant, VUS, negative results, phase, prognosis, and family risk.

Stargardt Disease Genetic Test: ABCA4 Gene Mutations and Results

Understand Tay-Sachs carrier testing with HEXA gene and Hex A enzyme analysis, including pseudodeficiency, B1 variants, pregnancy specimens, results, and partner risk.

Tay-Sachs Disease Carrier Test: HEXA Gene, Enzyme, and Results

Understand TSC1 and TSC2 genetic testing for tuberous sclerosis, including diagnostic results, VUS, negative tests, mosaicism, inheritance risk, and surveillance.

Tuberous Sclerosis Genetic Test: TSC1, TSC2 Genes, Risk, and Results

Understand Wilson disease ATP7B genetic testing and copper results, including ceruloplasmin, urine and liver copper, two variants, carrier findings, VUS, and family risk.

Wilson Disease Genetic Test: ATP7B Gene Mutations, Copper, and Results

Understand X-linked carrier screening, female carrier risk, inheritance for sons and daughters, test methods, result meanings, health follow-up, and pregnancy options.

X-Linked Carrier Screening Test: Female Carrier Risk and Results

Learn what an autoimmune disease genetic risk test measures, how HLA and immune-gene results are interpreted, and why positive or negative findings do not provide a diagnosis.

Autoimmune Disease Genetic Risk Test: HLA, Immune Genes, and Results

Learn how CVID genetic testing examines immune-disorder genes, what positive, negative, and uncertain results mean, and when a molecular diagnosis may change care.

Common Variable Immunodeficiency (CVID) Genetic Test: Immune Disorder Genes and Results

Learn how complement deficiency genetic testing evaluates immune-system genes, how CH50 and AH50 guide diagnosis, and what positive, negative, or uncertain results mean.

Complement Deficiency Genetic Test: Immune System Genes and Results

Learn how CDC, flow cytometry, and virtual crossmatch tests assess transplant compatibility, what a positive result means, and why donor-specific antibodies affect risk.

Crossmatch Test: Transplant Compatibility, Positive Result, and Meaning

Understand donor-specific antibody testing, including positive and negative DSA results, MFI, rejection risk, crossmatch findings, limitations, and follow-up after transplant.

Donor-Specific Antibody (DSA) Test: Transplant Rejection Risk and Results

Learn how MEFV testing supports familial Mediterranean fever diagnosis, including variants, carrier results, colchicine treatment, and amyloidosis risk.

Familial Mediterranean Fever Genetic Test: MEFV Gene, Inflammation, and Results

Understand hereditary angioedema genetic testing for SERPING1, F12, PLG, and other genes, including result meanings, inheritance, complement tests, and emergency care.

Hereditary Angioedema Genetic Test: SERPING1, F12, PLG, and Results

Understand HLA antibody testing, including PRA and cPRA, MFI, sensitization, donor-specific antibodies, transplant compatibility, limitations, and follow-up results.

HLA Antibody Test: Transplant Compatibility, PRA, and Results

Understand HLA matching for kidney, bone marrow, stem-cell, and organ transplant, including 6/6, 8/8, 10/10, haploidentical, mismatch, antibody, and crossmatch results.

HLA Matching Test: Kidney, Bone Marrow, Organ Transplant, and Results

Understand HLA typing methods, allele names, resolution, transplant matching, disease associations, drug-reaction risk, specimen issues, and result interpretation.

HLA Typing Test: Immune Matching, Transplant, Disease Risk, and Results

Understand HLA-A genetic testing, including allele names, tissue type, transplant matching, donor-specific antibodies, disease associations, drug risk, and result limitations.

HLA-A Genetic Test: Tissue Type, Transplant Matching, and Results

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