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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 32

Low ionized calcium means active blood calcium is low. Learn symptoms, causes, hypocalcemia risks, follow-up tests, kidney links, and when urgent care matters.

Low Ionized Calcium Test: Causes, Symptoms, Hypocalcemia, and Meaning

Learn what a low parathyroid hormone (PTH) blood test means, including calcium and phosphorus patterns, hypoparathyroidism causes, symptoms, follow-up tests, kidney disease links, and treatment monitoring.

Low Parathyroid Hormone (PTH) Blood Test: Causes, Calcium, Phosphorus, and Meaning

Learn what a low potassium blood test means, including common causes, symptoms, heart rhythm risks, severity ranges, related kidney markers, and treatment options.

Low Potassium Blood Test: Causes, Symptoms, Heart Rhythm, and Meaning

Learn what a low renin blood test means, including causes, blood pressure patterns, aldosterone links, potassium changes, testing preparation, and follow-up steps.

Low Renin Blood Test: Causes, Blood Pressure, Aldosterone, and Meaning

Low serum osmolality usually means diluted blood from low sodium or excess water. Learn causes, symptoms, follow-up tests, and safe treatment.

Low Serum Osmolality Test: Causes, Hyponatremia, Fluid Balance, and Meaning

Learn what a low sodium blood test means, including hyponatremia ranges, symptoms, common causes, follow-up tests, treatment options, and when urgent care is needed.

Low Sodium Blood Test: Causes, Symptoms, Hyponatremia, and Meaning

Low urea blood test meaning, causes, and follow-up. Learn how liver disease, low protein intake, malnutrition, pregnancy, hydration, BUN, creatinine, and kidney markers affect urea levels.

Low Urea Blood Test: Causes, Liver Disease, Low Protein, and Meaning

Low uric acid can reflect kidney uric acid loss, diet, medicines, SIADH, Fanconi syndrome, or inherited renal hypouricemia. Learn causes, risks, and follow-up tests.

Low Uric Acid Blood Test: Causes, Kidney Loss, Diet, and Meaning

Learn how magnesium and potassium patterns are interpreted together, including low magnesium with low potassium, kidney-related high potassium, symptoms, causes, follow-up tests, and when electrolyte results may need urgent care.

Magnesium and Potassium: Interpreting Electrolyte Imbalance Patterns

Learn what the NGAL test measures, why high NGAL levels may signal kidney injury, how urine and blood results differ, and how doctors interpret NGAL with creatinine, eGFR, BUN, electrolytes, and symptoms.

Neutrophil Gelatinase-Associated Lipocalin (NGAL) Test: Kidney Injury Marker, High Levels, and...

Learn the normal PTH blood test range, what high or low parathyroid hormone means, and how calcium, vitamin D, phosphorus, and kidney function change interpretation.

Parathyroid Hormone (PTH) Blood Test Normal Range: Reference Values and Meaning

Learn how potassium and creatinine are interpreted together, including normal ranges, high potassium risk, kidney function patterns, medication effects, urgent warning signs, and follow-up tests.

Potassium and Creatinine: Interpreting Kidney and Heart Rhythm Risk

Understand the potassium blood test normal range, what high and low potassium mean, common causes, false results, follow-up tests, and when urgent care may be needed.

Potassium Blood Test Normal Range: Reference Values and Meaning

Learn what a renal function panel measures, including creatinine, BUN, eGFR, electrolytes, albumin, calcium, phosphorus, normal ranges, abnormal patterns, and follow-up tests.

Renal Function Panel Test: Kidney Markers, Electrolytes, Albumin, Normal Ranges, and...

Learn how renin, aldosterone, and the aldosterone-renin ratio help evaluate resistant hypertension, low potassium, adrenal hormone patterns, and follow-up testing.

Renin and Aldosterone: Interpreting Blood Pressure Hormone Markers

Learn the renin blood test normal range, plasma renin activity and direct renin units, aldosterone-renin ratio meaning, and causes of high or low renin results.

Renin Blood Test Normal Range: Reference Values and Aldosterone-Renin Ratio

Understand the serum osmolality test normal range, what high and low results mean, how osmolal gap is calculated, and when abnormal results need follow-up.

Serum Osmolality Test Normal Range: Reference Values and Meaning

Learn how sodium and serum osmolality help interpret fluid balance, dehydration, hyponatremia, hypernatremia, glucose effects, osmolal gap, and safe follow-up.

Sodium and Osmolality: Interpreting Fluid Balance Without Overdoing It

Learn the sodium blood test normal range, what low and high sodium mean, common causes, symptoms, urgent warning signs, and how doctors interpret results with kidney and electrolyte markers.

Sodium Blood Test Normal Range: Reference Values and Meaning

Learn what the SDMA blood test measures, what high SDMA can mean for kidney function, typical normal ranges, units, causes, follow-up tests, and when results may be urgent.

Symmetric Dimethylarginine (SDMA) Test: High SDMA, Kidney Function Marker, Normal Range,...

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