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Learn how HLA-DR and CD38 flow cytometry measures activated T cells, what high results may mean, why ranges vary, and how clinicians plan follow-up.

Activated T-Cell Marker Test: HLA-DR, CD38, Immune Activation, and Inflammation

Understand how CD19 and CD20 B-cell counts are measured, why results may be high or low, how anti-CD20 therapy affects them, and which follow-up tests assess antibody function.

B-Cell Count Test: CD19, CD20, Immune Function, and Antibody Production

Learn what a CD4 count measures, how HIV affects helper T cells, what common ranges and thresholds mean, why results fluctuate, and how the test guides monitoring and infection prevention.

CD4 Count Test: Helper T Cells, Immune Function, HIV Monitoring, and Meaning

Learn how the CD4/CD8 ratio is calculated, what low or high results may mean, why an inverted ratio is nonspecific, and how the test adds context in HIV and immune monitoring.

CD4/CD8 Ratio Test: Immune Balance, High and Low Ratio, and Meaning

Learn what a CD8 count measures, why cytotoxic T-cell numbers may rise or fall, how viral infections affect results, and why cell quantity does not equal antiviral function.

CD8 Count Test: Cytotoxic T Cells, Immune Function, and Viral Response

Understand what a chemokine panel measures, why immune-signaling and cell-migration markers rise or fall, and how specialists interpret patterns and limitations.

Chemokine Panel Test: Immune Signaling, Inflammation, and Cell Migration Markers

Diagnostics

Home Diagnostics Page 44

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

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

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