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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 36

Low ferritin with normal hemoglobin can mean iron deficiency before anemia. Learn symptoms, causes, lab patterns, treatment options, and when follow-up matters.

Low Ferritin With Normal Hemoglobin: Iron Deficiency Without Anemia

Understand what a low folate blood test means, including common causes, anemia patterns, symptoms, related B12 and iron tests, and safe next steps for treatment.

Low Folate Blood Test: Causes, Deficiency, Anemia, and Meaning

Low hepcidin can mean iron deficiency, blood loss, increased red blood cell production, hemochromatosis, or iron-loading anemia. Learn how to interpret low hepcidin with ferritin, transferrin saturation, CBC patterns, and iron overload risk.

Low Hepcidin Blood Test: Causes, Iron Overload, Anemia Patterns, and Meaning

Learn what a low iodine blood test means, how it relates to thyroid function, common causes of iodine deficiency, follow-up tests, safe correction, and when medical care is needed.

Low Iodine Blood Test: Causes, Thyroid Function, Deficiency, and Meaning

Learn what a low magnesium blood test means, including common causes, symptoms, result ranges, follow-up tests, treatment options, and when low magnesium needs urgent care.

Low Magnesium Blood Test: Causes, Deficiency, Symptoms, and Meaning

Learn what a low manganese blood test can mean, including normal ranges, rare deficiency, causes, food sources, follow-up testing, and supplement safety.

Low Manganese Blood Test: Causes, Deficiency, Nutrition, and Meaning

Learn what a low molybdenum blood test may mean, including reference ranges, rare deficiency causes, symptoms, follow-up tests, diet sources, and when to seek care.

Low Molybdenum Blood Test: Causes, Deficiency, and Meaning

Learn what a low osteocalcin blood test means, including causes, bone formation links, reference ranges, treatment effects, follow-up tests, and when to seek care.

Low Osteocalcin Blood Test: Causes, Bone Formation, and Meaning

Learn what a low phosphorus blood test means, including symptoms, causes, mineral balance with calcium, vitamin D, PTH, kidney function, and next steps.

Low Phosphorus Blood Test: Causes, Symptoms, Mineral Balance, and Meaning

Learn what a low selenium blood test means, including common causes, deficiency symptoms, thyroid effects, normal ranges, follow-up tests, and safe ways to improve selenium status.

Low Selenium Blood Test: Causes, Deficiency, Thyroid Health, and Meaning

Low serum iron with normal ferritin can reflect early iron deficiency, inflammation, chronic disease, or timing effects. Learn how TSAT, TIBC, CBC, and symptoms clarify the pattern.

Low Serum Iron and Normal Ferritin: What the Pattern Can Mean

Low serum iron can mean iron deficiency, anemia, inflammation, blood loss, pregnancy, or poor absorption. Learn how serum iron fits with ferritin, TIBC, TSAT, symptoms, and follow-up testing.

Low Serum Iron Test: Causes, Iron Deficiency, Anemia, and Meaning

Learn what a low TIBC blood test means, including links to inflammation, liver disease, anemia patterns, transferrin, ferritin, iron overload, and follow-up tests.

Low Total Iron-Binding Capacity (TIBC) Test: Causes, Inflammation, Liver Disease, and...

Low transferrin can reflect inflammation, liver disease, kidney protein loss, malnutrition, or iron overload. Learn how to read low transferrin with ferritin, TIBC, TSAT, and anemia results.

Low Transferrin Blood Test: Causes, Inflammation, Liver Disease, and Meaning

Learn what low transferrin saturation means, including common TSAT ranges, iron deficiency patterns, anemia links, causes, follow-up tests, and treatment options.

Low Transferrin Saturation (TSAT) Test: Causes, Iron Deficiency, Anemia, and Meaning

Understand low UIBC blood test results, including iron overload, hemochromatosis, low transferrin, inflammation, ferritin, TSAT patterns, and next steps.

Low Unsaturated Iron-Binding Capacity (UIBC) Test: Causes, Iron Overload, and Meaning

Learn what a low vitamin A retinol blood test means, including deficiency cutoffs, symptoms, causes, normal ranges, follow-up tests, and safe treatment.

Low Vitamin A (Retinol) Test: Causes, Deficiency, Symptoms, and Meaning

Low vitamin B6 PLP blood test results can signal deficiency, inflammation, malabsorption, medication effects, kidney disease, or poor intake. Learn causes, symptoms, ranges, and follow-up tests.

Low Vitamin B6 (Pyridoxal-5-Phosphate/PLP) Test: Causes, Deficiency, and Meaning

Learn what a low vitamin B12 blood test means, including deficiency ranges, anemia patterns, nerve symptoms, common causes, follow-up tests, and treatment options.

Low Vitamin B12 Blood Test: Causes, Deficiency, Anemia, and Meaning

Learn what a low vitamin E alpha-tocopherol test means, including common causes, deficiency symptoms, reference ranges, lipid effects, follow-up tests, and treatment options.

Low Vitamin E (Alpha-Tocopherol) Test: Causes, Deficiency, and Meaning

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