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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 8

Learn how specific IgE blood tests identify allergen sensitization, what positive and negative values mean, when component testing helps, and how results guide allergy diagnosis.

Specific IgE Blood Test: Allergy Triggers, Positive Result, and Clinical Meaning

Learn what total IgE measures, why levels rise with allergy, eczema, asthma, parasites, or immune disorders, and how normal, high, and very high results are evaluated.

Total IgE Blood Test: High Levels, Allergy, Asthma, Parasites, and Immune...

Learn how acute and baseline tryptase tests are timed and compared, what high results can mean, and how tryptase supports evaluation of anaphylaxis, MCAS, hereditary alpha-tryptasemia, and mastocytosis.

Tryptase Blood Test: High Levels, Mast Cell Activation, Anaphylaxis, and Mastocytosis

Learn how wheat component IgE testing interprets omega-5 gliadin, Tri a 14, glutenins, cross-reactivity, and exercise-related anaphylaxis risk, and what positive or negative results can mean.

Wheat Component IgE Test: Wheat Allergy, Omega-5 Gliadin, and Exercise-Related Risk

Learn how the calcitonin blood test measures thyroid C-cell activity, why levels rise, how results relate to medullary thyroid cancer, and what follow-up may involve.

Calcitonin Blood Test: High Levels, Medullary Thyroid Cancer, C-Cells, and Results

Understand what a free T3 blood test measures, why levels may be high or low, how normal ranges vary, and when results help diagnose thyroid disease.

Free T3 (Free Triiodothyronine) Test: High, Low, Normal Range, and Thyroid...

Learn how a free T4 blood test helps identify hypothyroidism, hyperthyroidism, and pituitary disease, why ranges vary, and what high or low results may mean.

Free T4 (Free Thyroxine) Test: High, Low, Normal Range, and Thyroid...

Learn how the free thyroxine index combines total T4 and T3 uptake, what high or low FTI results suggest, and when binding proteins can affect interpretation.

Free Thyroxine Index (FTI) Test: Thyroid Function, T4 Binding, and Results

Understand the Graves disease blood test panel, including TSH, free T4, T3, TRAb, and TSI patterns used for diagnosis, treatment monitoring, and pregnancy care.

Graves Disease Blood Test Panel: TSH, Free T4, T3, TRAb, TSI,...

Understand the Hashimoto thyroiditis panel, including TSH, free T4, TPOAb, and TgAb patterns, what positive antibodies mean, and when treatment is needed.

Hashimoto Thyroiditis Blood Test Panel: TSH, Free T4, TPOAb, TgAb, and...

Understand a hyperthyroidism blood test panel, including low TSH, high T3 or T4, TRAb and TSI results, causes, interference, and follow-up.

Hyperthyroidism Blood Test Panel: Low TSH, T3, T4, TRAb, TSI, and...

Learn how high TSH, low or normal free T4, TPOAb, and TgAb results identify hypothyroidism, Hashimoto thyroiditis, treatment needs, and follow-up.

Hypothyroidism Blood Test Panel: High TSH, Free T4, TPOAb, TgAb, and...

Learn how neonatal TSH screening detects congenital hypothyroidism, why timing matters, what high or borderline results mean, and how babies are treated.

Neonatal TSH Test: Congenital Hypothyroidism, Newborn Thyroid Screening, and Results

Understand reverse T3 testing, including high and low results, assay ranges, illness effects, thyroid conversion claims, and why TSH and free T4 matter more.

Reverse T3 (rT3) Test: High, Low, Normal Range, and Thyroid Conversion

Learn what the T3 uptake test measures, why high or low results reflect TBG and hormone binding, how FTI is calculated, and which modern tests help.

T3 Uptake Test: Thyroid Hormone Binding, TBG, High and Low Results

Understand thyroglobulin testing after thyroid cancer, including high, low, or undetectable Tg, TSH stimulation, TgAb interference, trends, and imaging.

Thyroglobulin (Tg) Blood Test: Thyroid Cancer Follow-Up, High or Low Levels,...

Learn how thyroglobulin antibody results relate to Hashimoto and Graves disease, thyroid function, Tg assay interference, and thyroid cancer follow-up trends.

Thyroglobulin Antibody (TgAb) Test: Autoimmune Thyroid Disease and Results

Understand TPOAb, TgAb, TRAb, and TSI results, including Hashimoto and Graves patterns, normal thyroid function, pregnancy, and cancer follow-up.

Thyroid Antibody Panel: TPOAb, TgAb, TRAb, TSI, and Results

Learn how TSH, free T4, free T3, and thyroid antibodies fit together, what common result patterns mean, and when repeat testing or follow-up is needed.

Thyroid Function Test Panel: TSH, Free T4, Free T3, Thyroid Antibodies,...

Learn how TSH and free T4 guide levothyroxine dosing, when to retest, and how missed doses, absorption, pregnancy, and interactions affect results.

Thyroid Hormone Replacement Monitoring Test: TSH, Free T4, Levothyroxine Dose, and...

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