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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 28

Understand what HLA-DQ2 and HLA-DQ8 celiac genetic test results mean, when testing helps, how positive and negative findings differ, and what to do next.

HLA-DQ2 and HLA-DQ8 Test: Celiac Disease Risk and Results

Learn how HLA-DQB1 test results relate to type 1 diabetes, celiac disease, DQ2/DQ8 haplotypes, narcolepsy risk, testing methods, and follow-up.

HLA-DQB1 Test: Type 1 Diabetes, Celiac Disease, and Results

Understand HLA-DR genetic test results for transplant matching, donor selection, autoimmune susceptibility, HLA antibodies, crossmatch findings, and follow-up.

HLA-DR Genetic Test: Transplant Matching, Autoimmune Risk, and Results

Learn what an HLA-DRB1 shared epitope test means for rheumatoid arthritis susceptibility, positive and negative results, smoking interaction, diagnosis, and follow-up.

HLA-DRB1 Test: Rheumatoid Arthritis Risk, Shared Epitope, and Results

Understand KIR genetic test results, activating and inhibitory receptors, HLA-C ligands, AA and B/x genotypes, transplant uses, limitations, and next steps.

Killer Cell Immunoglobulin-Like Receptor (KIR) Test: Immune Genetics and Results

Understand PRA and calculated PRA transplant results, sensitization percentages, donor-specific antibodies, crossmatch testing, waiting-list impact, and next steps.

Panel Reactive Antibody (PRA) Test: Transplant Sensitization and Results

Understand periodic fever syndrome genetic panel results, including MEFV, MVK, TNFRSF1A, NLRP3, positive findings, VUS results, negative tests, and follow-up.

Periodic Fever Syndrome Genetic Panel: Autoinflammatory Genes and Results

Understand primary immunodeficiency genetic panel results, including immune disorder genes, pathogenic variants, VUS findings, negative tests, treatment impact, and family testing.

Primary Immunodeficiency Genetic Panel: Immune Disorder Genes and Results

Learn how SCID genetic testing identifies immune deficiency genes, explains positive, negative, carrier, and VUS results, and guides urgent treatment and family testing.

Severe Combined Immunodeficiency (SCID) Genetic Test: Immune Deficiency Genes and Results

Learn how autosomal dominant genetic tests work, what a 50% inheritance risk means, and how to interpret positive, negative, de novo, and VUS results.

Autosomal Dominant Genetic Test: Inheritance Risk and Results

Understand autosomal recessive genetic tests, carrier results, 25% pregnancy risk, partner testing, residual risk after a negative result, and reproductive options.

Autosomal Recessive Genetic Test: Carrier Risk and Results

Learn what carrier screening tests show, how positive and negative results affect genetic disease risk, why partner testing matters, and what options follow an at-risk result.

Carrier Screening Test: Genetic Disease Risk, Results, and What It Means

Learn what a chromosome analysis and karyotype can detect, how abnormal, balanced, mosaic, and normal results are reported, and when microarray or FISH is needed.

Chromosome Analysis Test: Karyotype, Abnormal Chromosomes, Genetic Disorders, and Results

Learn what DNA tests can show, how sequencing and genotyping work, what positive, negative, and VUS results mean, and which limitations matter before acting.

DNA Test: What It Shows, How It Works, and Results Explained

Understand positive, negative, and uncertain genetic diagnostic test results, including variant classifications, test limits, family implications, and follow-up.

Genetic Diagnostic Test: Positive, Negative, Variant, and Results Explained

Learn how genetic panel tests analyze multiple genes, when panels are useful, how positive, negative, and uncertain results are interpreted, and what limits to consider.

Genetic Panel Test: Multiple Genes, Disease Risk, and Results

Understand genetic screening tests, disease-risk estimates, positive and negative results, false results, residual risk, and the follow-up needed for confirmation.

Genetic Screening Test: Disease Risk, Results, and What It Means

Explore genetic testing types, benefits, risks, accuracy, positive and negative results, uncertain variants, privacy issues, and how to choose appropriate follow-up.

Genetic Testing: Types, Benefits, Risks, Results, and What They Mean

Understand pathogenic, likely pathogenic, benign, likely benign, and VUS genetic test results, including classification evidence, family testing, and reclassification.

Genetic Variant Test: Pathogenic, Benign, VUS, and Results Explained

Learn how germline genetic testing identifies inherited variants, explains family risk, distinguishes positive and negative results, and guides cascade testing and follow-up.

Germline Genetic Testing: Inherited Mutations, Family Risk, and Results

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