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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 54

Learn what the RBC magnesium test measures, common normal ranges, causes of low or high RBC magnesium, deficiency symptoms, serum vs RBC testing, and follow-up steps.

Red Blood Cell (RBC) Magnesium Test: Low RBC Magnesium, Normal Range,...

Learn what the reticulocyte hemoglobin content test measures, what low RET-He or CHr means, how it relates to iron deficiency and anemia, and which follow-up tests help explain results.

Reticulocyte Hemoglobin Content (CHr or RET-He) Test: Low RET-He, Iron Deficiency,...

Understand selenium blood test normal ranges, low and high selenium results, deficiency and toxicity causes, thyroid links, preparation, and safe follow-up steps.

Selenium Blood Test Normal Range: Reference Values and Meaning

Serum folate reflects recent folate intake, while RBC folate reflects longer-term folate status. Learn how the tests differ, what low or high results can mean, and how to interpret folate results with B12, CBC, MMA, homocysteine, diet, medications, and pregnancy needs.

Serum Folate vs RBC Folate: What Is the Difference?

Serum iron normal range, low and high result meanings, iron panel context, preparation tips, and when abnormal iron levels need medical follow-up.

Serum Iron Test Normal Range: Reference Values and Meaning

Serum magnesium is usually the first and most useful magnesium test, while RBC magnesium can add context in selected chronic cases. Learn how to interpret both tests, common result patterns, and when follow-up matters.

Serum Magnesium vs RBC Magnesium: Which Magnesium Test Matters More?

Understand the soluble transferrin receptor test, what high sTfR can mean, how it helps detect iron deficiency, and how results compare with ferritin, TSAT, and CBC findings.

Soluble Transferrin Receptor (sTfR) Test: High sTfR, Iron Deficiency, Anemia, and...

TIBC and transferrin both help interpret iron panels, but they measure different things. Learn how high or low results relate to iron deficiency, inflammation, liver disease, and iron overload.

TIBC vs Transferrin: What Is the Difference in an Iron Panel?

Learn the normal range for the TIBC blood test, what high and low total iron-binding capacity mean, and how TIBC fits with ferritin, serum iron, and transferrin saturation.

Total Iron-Binding Capacity (TIBC) Test Normal Range: Reference Values and Meaning

Learn the normal transferrin blood test range, what high and low transferrin mean, and how transferrin fits with ferritin, TIBC, serum iron, and TSAT.

Transferrin Blood Test Normal Range: Reference Values and Meaning

Learn the normal transferrin saturation range, what low or high TSAT means, how it is calculated, and how TSAT fits with ferritin, serum iron, TIBC, and anemia testing.

Transferrin Saturation (TSAT) Normal Range: Reference Values and Meaning

Learn what the UIBC blood test measures, the common normal range, and how high or low UIBC results relate to iron deficiency, iron overload, ferritin, TIBC, and transferrin saturation.

Unsaturated Iron-Binding Capacity (UIBC) Test Normal Range: Reference Values and Meaning

Learn what a vitamin A retinol blood test measures, common normal ranges, low and high result meanings, deficiency cutoffs, toxicity concerns, preparation tips, and follow-up tests.

Vitamin A (Retinol) Test Normal Range: Reference Values and Meaning

Learn what a vitamin and mineral blood test panel measures, how to interpret low or high nutrient levels, which markers matter, and when follow-up testing is needed.

Vitamin and Mineral Blood Test Panel: Deficiency, Toxicity, Nutrient Levels, and...

Learn what a vitamin B1 thiamine test measures, common normal ranges, low and high result meanings, deficiency symptoms, causes, preparation, and follow-up steps.

Vitamin B1 (Thiamine) Test: Low Thiamine, Deficiency, Normal Range, and Results

Learn what a vitamin B2 riboflavin test measures, normal ranges for plasma, whole blood, and EGRAC, causes of low riboflavin, deficiency symptoms, and follow-up testing.

Vitamin B2 (Riboflavin) Test: Low Riboflavin, Deficiency, Normal Range, and Results

Learn what a vitamin B3 niacin test measures, what low or high results mean, common normal ranges, deficiency symptoms, pellagra risk, test preparation, and safe follow-up.

Vitamin B3 (Niacin) Test: Low Niacin, Deficiency, Normal Range, and Results

Learn what a vitamin B5 blood test measures, what low pantothenic acid may mean, how normal ranges vary, and how to interpret deficiency or high results.

Vitamin B5 (Pantothenic Acid) Test: Low Pantothenic Acid, Deficiency, Normal Range,...

Understand the vitamin B6 PLP blood test normal range, low and high results, symptoms, causes, supplement risks, preparation tips, and follow-up testing.

Vitamin B6 (Pyridoxal-5-Phosphate/PLP) Test Normal Range: Reference Values and Meaning

Learn what a vitamin B7 biotin test measures, normal range examples, causes of low biotin, deficiency symptoms, high supplement levels, lab interference, and follow-up testing.

Vitamin B7 (Biotin) Test: Low Biotin, Deficiency, Normal Range, and Results

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