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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 48

Learn what the CK-MB blood test measures, what high CK-MB means, normal range patterns, timing after heart muscle injury, and how doctors interpret results.

CK-MB Blood Test: High CK-MB, Heart Muscle Injury, Normal Range, and...

Learn what the CK-MB relative index means, how the CK-MB ratio is calculated, which results suggest heart injury or skeletal muscle damage, and when urgent follow-up matters.

CK-MB Relative Index Test: Heart Injury, Skeletal Muscle Damage, CK-MB Ratio,...

Learn what the copeptin blood test measures, how it helps early heart attack rule-out with troponin, what high and low results mean, and when follow-up matters.

Copeptin Blood Test: Heart Attack Rule-Out Marker, Stress Response, and Results

Learn what a creatine kinase CK test measures, what high CK means, normal range issues, muscle damage causes, rhabdomyolysis warning signs, and follow-up tests.

Creatine Kinase (CK) Test: High CK, Normal Range, Muscle Damage, Rhabdomyolysis,...

Learn what a galectin-3 blood test measures, what high galectin-3 means, common ng/mL result ranges, heart failure risk, fibrosis, kidney effects, and next steps.

Galectin-3 Blood Test: High Galectin-3, Heart Failure Risk, Fibrosis, and Results

Learn what the H-FABP blood test measures, why it rises early after heart injury, how results are interpreted, and how it compares with troponin, CK-MB, and myoglobin.

Heart-Type Fatty Acid Binding Protein (H-FABP) Test: Heart Injury Marker, Heart...

Learn what a high-sensitivity troponin I test measures, normal 99th percentile ranges, what high levels mean, and how doctors use results to assess heart attack and heart injury.

High-Sensitivity Troponin I Test: Heart Attack, Normal Range, High Levels, and...

High-sensitivity troponin can detect small heart muscle injuries early. Learn how low-level elevations, repeat testing, symptoms, and emergency warning signs are interpreted.

High-Sensitivity Troponin: Interpreting Low-Level Elevations Without Missing Emergencies

Learn what the high-sensitivity troponin T test measures, normal hs-cTnT ranges, what high levels mean, and how repeat results help diagnose heart attack.

High-Sensitivity Troponin T Test: Heart Attack, Normal Range, High Levels, and...

Learn what the ischemia-modified albumin (IMA) test measures, why high IMA can occur, how it relates to cardiac ischemia, and why it does not replace troponin or ECG testing.

Ischemia-Modified Albumin (IMA) Test: Cardiac Ischemia, High IMA, Heart Risk, and...

Learn what a high LDH blood test means, including normal LDH range, tissue damage causes, muscle injury patterns, false high results, and follow-up tests.

Lactate Dehydrogenase (LDH) Test: High LDH, Normal Range, Tissue Damage, Muscle...

Learn what the LDH isoenzymes test measures, how LDH-1 through LDH-5 patterns relate to heart, liver, muscle, lung, and blood cell damage, and what abnormal results usually need next.

LDH Isoenzymes Test: Heart, Muscle, Liver, Blood Cell Damage, and Results

Learn what the MPO blood test measures, what high myeloperoxidase means for artery inflammation and heart risk, common result ranges, causes, follow-up tests, and when urgent care matters.

Myeloperoxidase (MPO) Test: Artery Inflammation, Heart Risk, High MPO, and Results

Myoglobin and creatinine help show muscle breakdown timing and kidney risk in rhabdomyolysis. Learn how to interpret result patterns, CK trends, urine findings, electrolytes, and warning signs.

Myoglobin and Creatinine: Interpreting Rhabdomyolysis and Kidney Risk

Understand the myoglobin blood test, including normal ranges, high myoglobin causes, muscle injury, rhabdomyolysis, heart attack testing, kidney risk, urine myoglobin, and follow-up tests.

Myoglobin Blood Test: High Myoglobin, Muscle Injury, Heart Attack, Kidney Risk,...

Learn what a myositis blood marker panel measures, including CK, aldolase, autoantibodies, inflammation markers, organ tests, result patterns, and urgent warning signs.

Myositis Blood Marker Panel: Muscle Enzymes, Autoantibodies, Inflammation, and Results

Learn what the NT-proBNP blood test measures, what high and normal results mean, common heart failure cutoffs, causes of elevated NT-proBNP, and next steps.

NT-proBNP Blood Test: High NT-proBNP, Heart Failure, Normal Range, and Results

Learn what a rhabdomyolysis blood test panel measures, including CK, myoglobin, creatinine, electrolytes, kidney risk, urine findings, causes, and urgent result patterns.

Rhabdomyolysis Blood Test Panel: CK, Myoglobin, Kidney Risk, Muscle Breakdown, and...

Learn what a skeletal muscle enzyme panel measures, how CK, aldolase, LDH, and AST results are interpreted, and when high muscle enzymes need urgent follow-up.

Skeletal Muscle Enzyme Panel: CK, Aldolase, LDH, AST, Muscle Injury, and...

Learn what the soluble ST2 blood test measures, what high sST2 means, how it relates to heart failure risk, and how results compare with BNP, NT-proBNP, troponin, and galectin-3.

Soluble ST2 (sST2) Blood Test: High sST2, Heart Failure Risk, Cardiac...

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