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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 15

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

Thoracic Aortic Aneurysm Genetic Test: FBN1, TGFBR1, TGFBR2, 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.

Thrombophilia Genetic Test: Factor V Leiden, Prothrombin G20210A, 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 Genetic Test: COL3A1 Gene 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 Genetic Test: ATP7B, Copper Metabolism, 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.

ALK Mutation Test: Lung Cancer, Targeted Therapy, 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.

APC Genetic Test: Familial Adenomatous Polyposis, Colon Cancer Risk, 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.

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

Learn what an ATM genetic test shows, how positive, negative, and uncertain results affect breast and other cancer risk, and how screening and family testing are planned.

ATM Genetic Test: Breast Cancer Risk, DNA Repair, and Results

Learn what a BAP1 genetic test shows, how results relate to melanoma, mesothelioma, and kidney cancer risk, and how surveillance and family testing are planned.

BAP1 Genetic Test: Melanoma, Mesothelioma, Kidney Cancer Risk, and Results

Understand what a BCL2 rearrangement test shows, how results support follicular lymphoma diagnosis, and why concurrent MYC and BCL2 rearrangements identify double-hit lymphoma.

BCL2 Rearrangement Test: Follicular Lymphoma, Double-Hit Lymphoma, and Results

Learn what a BCL6 rearrangement test shows, how positive and negative results are interpreted, and how BCL6, MYC, and BCL2 findings affect lymphoma classification and prognosis.

BCL6 Rearrangement Test: Lymphoma, Prognosis, and Results

Understand BCR-ABL1 testing for CML and Philadelphia-positive leukemia, including diagnostic methods, International Scale results, molecular response milestones, and resistance testing.

BCR-ABL1 Test: CML, Leukemia, Philadelphia Chromosome, and Results

Understand BRAF mutation testing in melanoma, colorectal, thyroid, and lung cancer, including V600E results, testing methods, targeted therapy, and negative-test limitations.

BRAF Mutation Test: Melanoma, Colon, Thyroid, Lung Cancer, and Results

Understand BRCA1 and BRCA2 genetic testing, cancer risks, positive, negative, and VUS results, screening, preventive surgery, treatment options, and family testing.

BRCA1 and BRCA2 Genetic Test: Cancer Risk, Mutations, and Results

Understand CALR mutation testing for high platelets, essential thrombocythemia, and primary myelofibrosis, including type 1 and type 2 results, prognosis, and follow-up.

CALR Mutation Test: Myeloproliferative Neoplasm, Platelets, and Results

Understand the CCND1/IGH fusion test for mantle cell lymphoma, including t(11;14), FISH results, cyclin D1 and SOX11 findings, prognosis, and diagnostic limits.

CCND1/IGH Fusion Test: Mantle Cell Lymphoma and Results

Understand CDH1 genetic testing, diffuse gastric and lobular breast cancer risks, positive and VUS results, expert endoscopy, preventive gastrectomy, and family testing.

CDH1 Genetic Test: Hereditary Diffuse Gastric Cancer Risk and Results

Understand CEBPA mutation testing in AML, including in-frame bZIP results, favorable-risk classification, germline familial leukemia, treatment, MRD, and test limitations.

CEBPA Mutation Test: AML Prognosis, Leukemia Genetics, and Results

Understand CHEK2 genetic test results, variant-specific breast cancer risk, changing colon guidance, prostate screening, inheritance, family testing, and next steps.

CHEK2 Genetic Test: Breast, Colon, Prostate Cancer Risk, and Results

Understand ctDNA test results for liquid biopsy profiling, targeted therapy, treatment response, molecular residual disease, recurrence risk, false negatives, and follow-up.

Circulating Tumor DNA (ctDNA) Test: Cancer Monitoring, Mutations, and Results

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