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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 27

Learn what the ApoA1 blood test measures, what low ApoA1 means, normal ranges, HDL function, ApoB/ApoA1 ratio, and how results relate to heart risk.

Apolipoprotein A1 (ApoA1) Test: Low ApoA1, Normal Range, HDL Function, and...

Learn what the ApoB blood test measures, what high ApoB means, common ApoB targets, why ApoB can reveal LDL particle risk, and how results are used with cholesterol testing.

Apolipoprotein B (ApoB) Test: High ApoB, Normal Range, LDL Particle Risk,...

Learn what an ApoE genotype test shows, how ε2, ε3, and ε4 affect cholesterol and Alzheimer’s risk, and how to interpret results with lipid markers and clinical context.

Apolipoprotein E (ApoE) Genotype Test: Cholesterol Risk, Alzheimer’s Risk, Genetics, and...

Learn what a ceramide blood test measures, how to interpret high ceramide levels and risk scores, common reference ranges, cardiovascular risk meaning, and follow-up steps.

Ceramide Blood Test: High Ceramide Levels, Normal Range, Cardiovascular Risk, and...

Learn what a cholesterol balance test measures, how sitosterol, campesterol, lathosterol, and desmosterol results are interpreted, and when absorption or production markers may guide cholesterol treatment.

Cholesterol Balance Test: Cholesterol Absorption, Production Markers, Sitosterol, Campesterol, and Results

Learn the normal and optimal HDL cholesterol range, what low or very high HDL can mean, how HDL fits with LDL and triglycerides, and when follow-up testing matters.

HDL Cholesterol Test Normal and Optimal Range: Reference Values and Meaning

Learn what the HDL-P test measures, what low HDL particle number means, common HDL-P ranges, and how HDL particles fit into heart and metabolic risk.

HDL Particle Number (HDL-P) Test: Low HDL-P, Normal Range, HDL Particles,...

High HDL cholesterol is often favorable, but very high HDL may not always protect the heart. Learn HDL ranges, causes, risks, and what to check next.

High HDL Cholesterol Test: Meaning, Heart Health, Very High HDL, and...

Learn what a high LDL cholesterol test means, including LDL ranges, common causes, heart disease risk, follow-up testing, and ways to lower LDL safely.

High LDL Cholesterol Test: Causes, Heart Disease Risk, and Meaning

Learn what high total cholesterol means, common causes, heart disease risk, important follow-up tests, and how LDL, HDL, triglycerides, non-HDL cholesterol, and ApoB change interpretation.

High Total Cholesterol Test: Causes, Heart Disease Risk, and Meaning

Learn what a high triglycerides blood test means, including common causes, fasting ranges, pancreatitis risk, heart risk, follow-up tests, and ways to lower triglycerides.

High Triglycerides Blood Test: Causes, Pancreatitis Risk, Heart Risk, and Meaning

Learn what a high VLDL cholesterol test means, how it relates to triglycerides, common causes, heart and pancreatitis risk, follow-up tests, and ways to lower VLDL.

High VLDL Cholesterol Test: Causes, Triglycerides, Heart Risk, and Meaning

Understand the hs-CRP blood test, including what it measures, normal and high ranges, heart risk meaning, common causes of elevated results, preparation, and follow-up steps.

High-Sensitivity C-Reactive Protein (hs-CRP) Test: Inflammation, Heart Risk, Normal Range, and...

Learn what a homocysteine blood test measures, what high levels mean, normal ranges, B-vitamin links, cardiovascular risk evidence, and follow-up testing.

Homocysteine Blood Test: High Homocysteine, Normal Range, B Vitamins, and Cardiovascular...

Learn how hs-CRP and lipid panel results work together to show inflammation, cholesterol patterns, triglyceride risk, and next steps for heart disease prevention.

hs-CRP and Lipid Panel: Interpreting Inflammation and Heart Risk

Understand the IDL cholesterol test, high IDL causes, normal range limits, remnant cholesterol calculation, and how IDL relates to triglycerides, ApoB, LDL, and atherosclerosis risk.

IDL Cholesterol Test: High IDL, Normal Range, Remnant Cholesterol, and Atherosclerosis...

Understand LDL cholesterol normal ranges, optimal levels, high results, and treatment targets by cardiovascular risk, including LDL goals below 100, 70, and 55 mg/dL.

LDL Cholesterol Test Normal and Optimal Range: Reference Values and Targets

Learn what the LDL-P test measures, common LDL particle number ranges, why high LDL-P can raise heart disease risk, and how LDL-P compares with LDL cholesterol and ApoB.

LDL Particle Number (LDL-P) Test: High LDL-P, Normal Range, Particle Count,...

Learn what an LDL particle size test shows, what Pattern A and Pattern B mean, why small dense LDL matters, and how results fit with ApoB, LDL-P, triglycerides, and heart disease risk.

LDL Particle Size Test: Pattern A, Pattern B, Small Dense LDL,...

Learn what the LDL/HDL ratio means, how to calculate it, what high and low results suggest, and why LDL, non-HDL cholesterol, ApoB, Lp(a), and overall heart risk matter more than the ratio alone.

LDL/HDL Ratio Test: Normal Range, High Ratio, Cholesterol Risk, and Meaning

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