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Understand ALK fusion testing in lung cancer, including what a positive or negative result means, tissue and ctDNA methods, limitations, and treatment relevance.

ALK Fusion Test for Lung Cancer: Gene Fusion, Positive Result, and Molecular Meaning

Understand BRAF V600E testing in lung cancer, including what a positive or negative result means, tissue and ctDNA methods, limitations, and treatment relevance.

BRAF V600E Test for Lung Cancer: Mutation Status, Positive Result, and Molecular Meaning

Learn how the carcinoembryonic antigen (CEA) test is used in lung cancer, what high levels can mean, common non-cancer causes, reference ranges, and why serial trends matter.

CEA Test for Lung Cancer: Tumor Marker Monitoring, High Levels, and Result Meaning

Learn how the cytokeratin 19 fragment 21-1 (CYFRA 21-1) test is used in lung cancer, what high levels can mean, common non-cancer causes, reference ranges, and why serial trends matter.

CYFRA 21-1 Test for Lung Cancer: Tumor Marker Levels and Disease Monitoring

Understand EGFR exon 20 insertion testing in lung cancer, including what a positive or negative result means, tissue and ctDNA methods, limitations, and treatment relevance.

EGFR Exon 20 Insertion Test: Lung Cancer Mutation Status and Molecular Meaning

Understand EGFR mutation testing in lung cancer, including what a positive or negative result means, tissue and ctDNA methods, limitations, and treatment relevance.

EGFR Mutation Test for Lung Cancer: Exon 19, L858R, T790M, Mutation Status, and...

Diagnostics

Home Diagnostics Page 36

Learn how a CAH test panel uses 17-OHP, cortisol, androgens, renin, aldosterone, stimulation, and genetics to identify enzyme deficiencies and monitor treatment safely.

Congenital Adrenal Hyperplasia (CAH) Test Panel: 17-OHP, Androgens, and Results

Learn how timing, stress, medicines, binding proteins, ACTH, and dynamic testing determine what high, low, or normal cortisol blood results mean for adrenal function.

Cortisol Blood Test: High, Low, Normal Range, Stress, and Adrenal Function

Learn how late-night cortisol, 24-hour urine free cortisol, dexamethasone suppression, ACTH, imaging, and repeat testing work together to diagnose Cushing syndrome.

Cushing Syndrome Test Panel: Late-Night Cortisol, Urine Free Cortisol, Dexamethasone, ACTH,...

Understand what a deoxycorticosterone (DOC) blood test measures, why high DOC can cause low-renin hypertension and low potassium, and how results are interpreted.

Deoxycorticosterone (DOC) Test: Adrenal Hormone, Blood Pressure, and Results

Learn what a DHEA blood test measures, why levels may be high or low, how age and timing affect the normal range, and which adrenal hormone tests may come next.

DHEA Blood Test: High, Low, Normal Range, Adrenal Function, and Results

Understand what a DHEA-S blood test shows, normal ranges by age and sex, causes of high or low adrenal androgen levels, and the follow-up tests used to interpret results.

DHEA-S Blood Test: High, Low, Normal Range, Adrenal Androgens, and Results

Learn how the high-dose dexamethasone suppression test is used in ACTH-dependent Cushing syndrome, what 50% cortisol suppression means, and why other localization tests are often needed.

High-Dose Dexamethasone Suppression Test: Cushing Disease and Results

Learn how late-night cortisol screening detects loss of the normal cortisol rhythm, what high salivary results mean, common false positives, and which Cushing tests usually follow.

Late-Night Cortisol Test: High Levels, Cushing Syndrome Screening, and Results

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...

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

Learn how aldosterone, renin, potassium, and the ARR screen for primary aldosteronism, how medicines affect results, and when confirmation, CT, or adrenal vein sampling is needed.

Primary Aldosteronism Test Panel: Aldosterone, Renin, Potassium, ARR, and Results

Learn what high or low renin means, how PRA differs from direct renin, how aldosterone and potassium complete the pattern, and why medicines and posture affect the ARR.

Renin Blood Test: High, Low, Normal Range, Aldosterone Ratio, and Results

Learn how salivary cortisol reflects the daily rhythm, when late-night testing screens for Cushing syndrome, why stress panels have limits, and what high, low, or flat results may mean.

Salivary Cortisol Test: Cortisol Rhythm, Cushing Screening, Stress Hormone, and Results

Learn how a 24-hour urine catecholamines test measures epinephrine, norepinephrine, and dopamine, why collection quality matters, and when metanephrine testing is preferred.

Urine Catecholamines Test: Adrenal Tumor Screening and Results

Learn how 22q11.2 deletion syndrome genetic testing works, what positive, negative, prenatal, and family results mean, and which follow-up evaluations may be needed.

22q11.2 Deletion Syndrome Genetic Test: DiGeorge Syndrome and Results

Understand how amniocentesis tests fetal chromosomes and DNA, when it is offered, how the procedure works, what results mean, and the risks and alternatives.

Amniocentesis Genetic Test: Chromosomes, DNA, Diagnosis, and Results

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