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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 20

Learn what a heavy metals blood test panel measures, how lead, mercury, arsenic, and cadmium results are interpreted, and when blood, urine, or follow-up testing matters.

Heavy Metals Blood Test Panel: Lead, Mercury, Arsenic, Cadmium, Toxicity, and...

Learn what an isopropanol blood test measures, how high levels are interpreted, why poisoning causes ketosis without acidosis, and when urgent care is needed.

Isopropanol Blood Test: Toxic Alcohol Poisoning, High Levels, Exposure, and Results

Learn how blood lead and zinc protoporphyrin results help distinguish recent lead exposure, sustained exposure, iron deficiency, anemia patterns, and when follow-up or urgent care is needed.

Lead and Zinc Protoporphyrin: Interpreting Lead Exposure and Iron Deficiency

Learn what a lithium blood test measures, typical therapeutic and toxic levels, 12-hour trough timing, bipolar medication monitoring, and what high or low results may mean.

Lithium Blood Test: Therapeutic Range, Toxic Level, Bipolar Medication Monitoring, and...

Learn how lithium levels, kidney function tests, timing, therapeutic ranges, and toxicity symptoms are interpreted during lithium therapeutic drug monitoring.

Lithium Level and Kidney Function: Interpreting Therapeutic Drug Monitoring

Learn what a manganese blood test measures, what high manganese may mean, normal range issues, exposure sources, toxicity symptoms, and follow-up after abnormal results.

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

Learn what a mercury blood test measures, what high mercury levels can mean, normal range basics, exposure sources, toxicity symptoms, and when follow-up testing matters.

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

Learn the difference between mercury blood and hair tests, when urine testing is needed, what each result can show, and how exposure source affects interpretation.

Mercury Blood Test vs Hair Test: What Is the Difference?

Methanol blood testing helps diagnose toxic alcohol poisoning, interpret high levels, assess vision risk, and guide urgent treatment with antidotes, bicarbonate, and dialysis.

Methanol Blood Test: Toxic Alcohol Poisoning, High Levels, Vision Risk, and...

Learn how methemoglobin and carboxyhemoglobin tests are interpreted, what abnormal levels can mean, why pulse oximetry may mislead, and when urgent care is needed.

Methemoglobin and Carboxyhemoglobin: Interpreting Abnormal Hemoglobin Toxicity Tests

Learn what a methemoglobin blood test measures, what high levels mean, normal range, cyanosis symptoms, common toxicity causes, and when urgent treatment is needed.

Methemoglobin Blood Test: High Methemoglobin, Cyanosis, Toxicity, Normal Range, and Results

Learn what a methotrexate blood test measures, how drug levels guide high-dose methotrexate clearance, what toxic or delayed results can mean, and when follow-up care matters.

Methotrexate Blood Test: Drug Level, Toxicity, Clearance, Therapeutic Monitoring, and Results

Learn what a nickel blood test measures, what high nickel may mean, how normal ranges vary, and when exposure, allergy, toxicity, or follow-up testing matters.

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

Learn what a phenobarbital blood test measures, common therapeutic and toxic levels, when seizure medication monitoring is needed, and how results are interpreted.

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

Learn what a phenytoin blood test measures, the usual therapeutic range, toxic level signs, total vs free phenytoin results, and how monitoring guides seizure medication safety.

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

Learn what a platinum blood test measures, what high platinum may mean, how exposure and chemotherapy affect results, and when follow-up or urgent care is needed.

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

Learn what a salicylate blood test measures, how aspirin toxicity levels are interpreted, when repeat testing matters, and when high salicylate results need urgent care.

Salicylate Blood Test: Aspirin Toxicity, High Levels, Overdose, and Results

Understand the sirolimus blood test, trough timing, therapeutic ranges, toxic level concerns, transplant monitoring, drug interactions, and how results are interpreted.

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

Learn how tacrolimus trough levels and creatinine are interpreted together after transplant, including target ranges, kidney risk, drug interactions, timing, and when to call the transplant team.

Tacrolimus and Creatinine: Interpreting Transplant Drug Monitoring

Learn what a tacrolimus blood test measures, how trough levels are timed, what therapeutic and toxic ranges can mean, and how transplant teams interpret results.

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

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