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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 19

Learn what a beryllium blood test measures, how high beryllium and BeLPT results are interpreted, what exposure sources matter, and when follow-up testing is needed.

Beryllium Blood Test: High Beryllium, Exposure, Toxicity, Normal Range, and Results

Learn what a bismuth blood test measures, what high bismuth can mean, common exposure sources, toxicity symptoms, normal range issues, and when urgent care is needed.

Bismuth Blood Test: High Bismuth, Exposure, Toxicity, Normal Range, and Results

Learn how blood alcohol, methanol, ethylene glycol, and isopropanol results are interpreted with osmolal gap, anion gap, acidosis, symptoms, and urgent treatment decisions.

Blood Alcohol, Methanol, and Ethylene Glycol: Interpreting Toxic Alcohol Panels

Learn what a blood drug screen test checks, how long common drugs stay detectable in blood, what positive and negative results mean, and when confirmation testing matters.

Blood Drug Screen Test: Common Drugs, Positive Results, Detection Window, and...

Understand how blood lead and hemoglobin results fit together, why lead can contribute to anemia, which CBC patterns matter, and when follow-up testing or urgent care is needed.

Blood Lead and Hemoglobin: Interpreting Anemia and Lead Exposure

Learn what a blood lead test measures, what high lead levels mean, CDC reference values, poisoning symptoms, exposure sources, confirmatory testing, and follow-up steps.

Blood Lead Test: High Lead Level, Normal Range, Lead Poisoning, Toxicity,...

Learn how admium blood and urine tests, eGFR, creatinine, albumin-creatinine ratio, and tubular markers help interpret heavy metal kidney risk and follow-up needs.

Cadmium and Kidney Markers: Interpreting Heavy Metal Kidney Risk

Learn what a cadmium blood test measures, what high cadmium results can mean, typical ranges, exposure sources, toxicity risks, and follow-up testing.

Cadmium Blood Test: High Cadmium, Normal Range, Exposure, Toxicity, and Results

Understand the carbamazepine blood test, including the 4–12 mcg/mL therapeutic range, toxic levels, trough timing, high and low results, seizure medication monitoring, and urgent toxicity symptoms.

Carbamazepine Blood Test: Therapeutic Range, Toxic Level, Seizure Medication Monitoring, and...

Learn how carbamazepine, phenytoin, and valproic acid levels are interpreted, including therapeutic ranges, toxic patterns, timing issues, free vs total levels, and follow-up testing.

Carbamazepine, Phenytoin, and Valproic Acid: Interpreting Seizure Medication Levels

Understand the carbon monoxide blood test, carboxyhemoglobin levels, normal ranges, poisoning symptoms, result interpretation, urgent care needs, and follow-up testing.

Carbon Monoxide Blood Test: Carboxyhemoglobin Level, Poisoning, Normal Range, and Results

Learn what a chromium blood test measures, what high chromium can mean, normal range issues, exposure sources, toxicity symptoms, and follow-up testing.

Chromium Blood Test: High Chromium, Normal Range, Exposure, Toxicity, and Results

Learn what a cobalt blood test measures, what high cobalt may mean, normal range issues, metal-on-metal hip implant testing, toxicity symptoms, and follow-up steps.

Cobalt Blood Test: High Cobalt, Normal Range, Exposure, Toxicity, and Results

Learn what a cyanide blood test measures, how toxic cyanide levels are interpreted, when poisoning is suspected, and why treatment should not wait for results.

Cyanide Blood Test: Toxic Cyanide Level, Poisoning, Exposure, and Results

Learn how the cyclosporine blood test is used for transplant drug monitoring, therapeutic ranges, toxic levels, trough timing, high and low results, kidney risk, and follow-up testing.

Cyclosporine Blood Test: Therapeutic Range, Toxic Level, Transplant Drug Monitoring, and...

Learn what a digoxin blood test measures, common therapeutic and toxic levels, when to test, how timing affects results, and why potassium and kidney function matter.

Digoxin Blood Test: Therapeutic Range, Toxic Level, Heart Medication Monitoring, and...

Digoxin and potassium results must be interpreted together because potassium changes toxicity risk and high levels can signal severe overdose. Learn how timing, kidney function, symptoms, and ECG findings affect digoxin safety.

Digoxin Level and Potassium: Interpreting Toxicity Risk

Learn what an ethanol blood test measures, how BAC results are reported, what alcohol levels mean for intoxication and driving risk, and when urgent care is needed.

Ethanol Blood Test: Blood Alcohol Level, Intoxication, Legal Limit, and Results

Ethylene glycol blood test results help diagnose antifreeze poisoning, toxic alcohol exposure, kidney risk, and metabolic acidosis, but timing and supporting labs matter.

Ethylene Glycol Blood Test: Antifreeze Poisoning, Toxic Level, Kidney Risk, and...

Learn what a gentamicin blood test measures, how peak and trough levels are timed, common therapeutic ranges, toxic results, kidney and hearing risks, and follow-up steps.

Gentamicin Blood Test: Peak and Trough Levels, Therapeutic Range, Toxicity, and...

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