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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 28

LDL-P and ApoB both measure particle-related heart risk, but ApoB usually gives the broader, more practical view of atherogenic particle burden.

LDL-P vs ApoB: Particle Number, Atherogenic Risk, and Meaning

Learn what a lipid panel measures, including total cholesterol, LDL, HDL, triglycerides, non-HDL cholesterol, normal ranges, high and low results, fasting rules, causes, and follow-up steps.

Lipid Panel Test: Total Cholesterol, LDL, HDL, Triglycerides, Normal Ranges, and...

$Learn what a lipoprotein fractionation test measures, including LDL-P, HDL, VLDL, IDL, particle size, remnants, and how results relate to cardiovascular risk.$

Lipoprotein Fractionation Test: LDL, HDL, VLDL, IDL, Lipoprotein Particles, and Results

Learn what the Lipoprotein(a) blood test measures, what high Lp(a) means, common normal ranges, genetic causes, heart disease risk, and what to do next.

Lipoprotein(a) [Lp(a)] Test: High Lp(a), Normal Range, Genetics, and Heart Disease...

Low HDL cholesterol can signal higher heart and metabolic risk, especially with high triglycerides or insulin resistance. Learn causes, ranges, follow-up tests, and ways to improve the full lipid pattern.

Low HDL Cholesterol Test: Causes, Heart Risk, Metabolic Health, and Meaning

Learn what a low LDL cholesterol test result means, including very low LDL levels, common causes, treatment-related low LDL, health effects, symptoms, and follow-up testing.

Low LDL Cholesterol Test: Causes, Very Low LDL, Health Effects, and...

Learn what a low total cholesterol test means, including common causes, possible health effects, follow-up tests, and when very low cholesterol needs medical evaluation.

Low Total Cholesterol Test: Causes, Health Effects, and Meaning

Learn what low triglycerides mean, common causes, health effects, diet links, related blood tests, and when very low triglyceride levels need follow-up.

Low Triglycerides Blood Test: Causes, Diet, Health Effects, and Meaning

Learn what a low VLDL cholesterol test means, how it relates to triglycerides, common causes, when it may need follow-up, and how to read it with your lipid panel.

Low VLDL Cholesterol Test: Causes, Triglycerides, and Meaning

Learn how Lp(a) and ApoB reveal inherited and particle-related heart risk, what high results mean, and how to lower overall cardiovascular risk.

Lp(a) and ApoB: Interpreting Inherited and Particle-Related Heart Risk

Learn what the LP-IR score measures, the normal 0–100 range, what high results mean, how it relates to insulin resistance and diabetes risk, and what to do next.

LP-IR Score Test: Lipoprotein Insulin Resistance Score, Normal Range, Diabetes Risk,...

Learn what the Lp-PLA2 test measures, what high Lp-PLA2 may mean for vascular inflammation, stroke risk, and heart risk, and how results fit with cholesterol, ApoB, and cardiovascular prevention.

Lp-PLA2 Test: High Lp-PLA2, Vascular Inflammation, Stroke Risk, and Heart Risk

Learn what the myeloperoxidase MPO test measures, what high MPO means, common MPO ranges, artery inflammation links, plaque risk, causes, and follow-up steps.

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

NMR Lipoprotein Profile Test: LDL-P, HDL-P, Particle Size, Insulin Resistance, and...

Learn what non-HDL cholesterol measures, what high results mean, normal and high ranges, how it compares with LDL and ApoB, and how it affects heart risk.

Non-HDL Cholesterol Test: High Non-HDL, Normal Range, Atherogenic Cholesterol, and Heart...

Understand non-HDL cholesterol vs LDL cholesterol, including what each measures, how they are calculated, target ranges, high-triglyceride patterns, and heart risk meaning.

Non-HDL Cholesterol vs LDL Cholesterol: What Is the Difference?

Learn how the Omega-3 Index and triglycerides work together to clarify heart risk, metabolic health, high triglyceride causes, ranges, and follow-up steps.

Omega-3 Index and Triglycerides: Interpreting Heart and Metabolic Risk

Learn what the omega-3 index test measures, what low omega-3 levels mean, common target ranges, heart health links, preparation tips, and how to improve results.

Omega-3 Index Test: Low Omega-3 Levels, Normal Range, Heart Health, and...

Learn what the oxidized LDL test measures, what high OxLDL may mean, how normal ranges vary, and how OxLDL relates to artery inflammation and cardiovascular risk.

Oxidized LDL (OxLDL) Test: High OxLDL, Normal Range, Artery Inflammation, and...

Learn what a plant sterol blood test measures, how sitosterol and campesterol relate to cholesterol absorption, what high results may mean, and when to evaluate for sitosterolemia.

Plant Sterol Blood Test: Sitosterol, Campesterol, Cholesterol Absorption, and Results

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