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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 33

Understand the urea blood test normal range, BUN conversion, high and low urea causes, kidney function links, preparation, follow-up tests, and urgent warning signs.

Urea Blood Test Normal Range: Reference Values and Meaning

Learn the uric acid blood test normal range, what high and low results mean, how uric acid relates to gout and kidney stones, and when follow-up testing matters.

Uric Acid Blood Test Normal Range: Reference Values and Meaning

Learn how vitamin D blood tests relate to kidney function, calcium, phosphorus, PTH, CKD-mineral bone disorder, deficiency, toxicity, and follow-up results.

Vitamin D and Kidney Function Blood Test: Deficiency, Calcium Balance, CKD,...

Learn what the 1,25-dihydroxy vitamin D test measures, the normal calcitriol range, and what high or low results mean for calcium, PTH, kidney function, and vitamin D metabolism.

1,25-Dihydroxy Vitamin D Test Normal Range: Calcitriol Levels and Meaning

Understand the 25-hydroxy vitamin D test, including normal and optimal ranges, low and high vitamin D meanings, toxicity risk, preparation, and follow-up tests.

25-Hydroxy Vitamin D Test Normal and Optimal Range: Vitamin D Levels...

$Learn what an alkaline phosphatase isoenzyme test shows, how liver and bone ALP fractions are interpreted, what high ALP can mean, and which follow-up tests help identify the cause.$

Alkaline Phosphatase Isoenzyme Test: Bone Fraction, Liver Fraction, High ALP, and...

Learn what a beta-carotene blood test measures, what low or high beta-carotene means, how normal ranges vary, and how results relate to vitamin A status, diet, absorption, and supplements.

Beta-Carotene Blood Test: Low Beta-Carotene, Normal Range, Vitamin A Status, and...

Learn what the BSAP blood test measures, what high bone-specific alkaline phosphatase means, common causes, normal ranges, related bone markers, and follow-up steps.

Bone-Specific Alkaline Phosphatase (BSAP) Test: High BSAP, Bone Turnover, Bone Health,...

Learn the normal calcium blood test range, what high and low calcium mean, how albumin and ionized calcium affect results, and when follow-up is urgent.

Calcium Blood Test Normal Range: Reference Values and Meaning

Learn the ceruloplasmin blood test normal range, what low or high ceruloplasmin means, and how doctors use it with copper, urine copper, and liver tests.

Ceruloplasmin Blood Test Normal Range: Reference Values and Meaning

Learn what chromium blood test normal ranges mean, why serum and whole-blood reference values differ, and how high or low chromium results are interpreted.

Chromium Blood Test Normal Range: Reference Values and Meaning

Learn the cobalt blood test normal range, what high and low cobalt levels mean, how specimen type changes interpretation, and when implant or exposure follow-up matters.

Cobalt Blood Test Normal Range: Reference Values and Meaning

Learn the copper blood test normal range, what low and high copper mean, how ceruloplasmin and zinc affect results, and when abnormal copper levels need follow-up.

Copper Blood Test Normal Range: Reference Values and Meaning

Learn how ferritin and transferrin saturation work together to show iron deficiency, inflammation-related iron restriction, and possible iron overload without overreacting to one lab result.

Ferritin and Transferrin Saturation: Interpreting Iron Status Without Overdoing It

Learn what ferritin blood test ranges mean, including low ferritin, high ferritin, iron stores, inflammation, iron overload, and follow-up testing.

Ferritin Blood Test Normal Range: Iron Stores Reference Values and Meaning

Ferritin shows stored iron, while serum iron shows circulating iron. Learn how these tests differ, why results can disagree, and which iron patterns suggest deficiency, inflammation, or overload.

Ferritin vs Serum Iron: What Is the Difference?

Learn what a folate blood test measures, common normal ranges, what low or high folate means, and how folate results are interpreted with B12, CBC, MCV, and homocysteine.

Folate Blood Test Normal Range: Reference Values and Meaning

Learn what the hepcidin blood test measures, example normal ranges, and what high or low hepcidin means for iron deficiency, inflammation, and iron overload.

Hepcidin Blood Test Normal Range: Reference Values and Meaning

Learn what a high 1,25-dihydroxy vitamin D test means, including calcitriol causes, calcium risk, granulomatous disease, lymphoma, PTH patterns, and follow-up tests.

High 1,25-Dihydroxy Vitamin D Test: Causes, Calcium Balance, Granulomatous Disease, and...

Learn what a high 25-hydroxy vitamin D test means, including toxic ranges, supplement causes, calcium risk, hypercalcemia symptoms, follow-up tests, and safe next steps.

High 25-Hydroxy Vitamin D Test: Causes, Toxicity, Calcium Risk, and Meaning

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