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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 20

Understand CYP2D6 genetic test results, poor and ultrarapid metabolizer meanings, copy-number issues, drug effects, phenoconversion, and safe clinical use.

CYP2D6 Genetic Test: Drug Metabolism, Poor Metabolizer, and Results

Understand CYP2D6 opioid test results for codeine, tramadol, and oxycodone, including poor and ultrarapid metabolism, interactions, safety, and limits.

CYP2D6 Opioid Pharmacogenetic Test: Codeine, Tramadol, Oxycodone, and Results

Learn what a CYP3A4 genetic test shows, how CYP3A4*22 affects drug metabolism, which medicines may be influenced, and how to interpret results safely.

CYP3A4 Genetic Test: Drug Metabolism, Variants, and Results

Understand CYP3A5 genetic test results, tacrolimus expresser status, genotype-guided starting doses, trough monitoring, and safe transplant medication use.

CYP3A5 Genetic Test: Tacrolimus Dosing, Metabolism, and Results

Learn how DPYD genetic test results, activity scores, and DPD deficiency affect 5-FU and capecitabine dosing, toxicity risk, monitoring, and urgent care.

DPYD Genetic Test: Fluoropyrimidine Toxicity, 5-FU, Capecitabine, and Results

Learn how fluoropyrimidine pharmacogenetic testing uses DPYD results to guide 5-FU and capecitabine starting doses, monitoring, toxicity prevention, and emergency care.

Fluoropyrimidine Pharmacogenetic Test: DPYD, 5-FU, Capecitabine Toxicity, and Results

Understand G6PD genetic testing, enzyme activity, medication hemolysis risk, result interpretation, test limitations, and safe next steps.

G6PD Genetic Test: Medication Hemolysis Risk, Deficiency, and Results

Learn how HLA-A*31:01 testing estimates carbamazepine hypersensitivity risk, how positive and negative results guide prescribing, and which symptoms need urgent care.

HLA-A*31:01 Genetic Test: Carbamazepine Hypersensitivity Risk and Results

Understand HLA-B*15:02 testing for carbamazepine skin reaction risk, result interpretation, ancestry-based screening, related-drug choices, and urgent SJS/TEN warning signs.

HLA-B*15:02 Genetic Test: Carbamazepine Skin Reaction Risk and Results

Understand HLA-B*57:01 testing before abacavir, positive and negative result meaning, hypersensitivity symptoms, permanent rechallenge precautions, and HIV treatment alternatives.

HLA-B*57:01 Genetic Test: Abacavir Hypersensitivity Risk and Results

Understand HTR2A antidepressant testing, common variants, evidence for response and side effects, report limitations, and why current guidelines recommend no HTR2A-based action.

HTR2A Genetic Test: Antidepressant Response, Side Effects, and Results

Understand what an IFNL3 or IL28B genetic test shows, how CC, CT, and TT results were used in older hepatitis C care, and why modern DAA treatment relies on other clinical tests.

IFNL3 Genetic Test: Hepatitis C Treatment Response and Results

Learn how NAT2 testing identifies slow, intermediate, or rapid isoniazid acetylator status, what the result may mean for TB treatment and toxicity, and why specialist monitoring remains essential.

NAT2 Genetic Test: Isoniazid Metabolism, Slow Acetylator Status, and Results

Understand NUDT15 test results, thiopurine leukopenia risk, and how normal, intermediate, or poor metabolizer status can affect mercaptopurine, azathioprine, and thioguanine starting doses.

NUDT15 Genetic Test: Thiopurine Toxicity, Leukopenia Risk, and Results

Understand what an OPRM1 genetic test shows, how AA, AG, and GG results relate to opioid response, why dosing guidance is limited, and how to use results safely.

OPRM1 Genetic Test: Opioid Response, Pain Treatment, and Results

Learn how pain medication pharmacogenetic testing uses CYP2D6, OPRM1, and related genes to clarify opioid response, codeine and tramadol risks, test results, and treatment choices.

Pain Medication Pharmacogenetic Test: Opioids, CYP2D6, OPRM1, and Results

Understand what a pharmacogenetic panel test measures, which medication-response genes may be actionable, how results are interpreted, and how panels can guide safer prescribing.

Pharmacogenetic Panel Test: Medication Response, Gene Variants, and Results

Learn what psychiatric pharmacogenetic testing can and cannot predict for antidepressants and antipsychotics, including CYP2D6, CYP2C19, SLC6A4, results, limits, and safe treatment use.

Psychiatric Pharmacogenetic Test: Antidepressants, Antipsychotics, Genes, and Results

Learn how RYR1 genetic testing evaluates malignant hyperthermia susceptibility, what positive, negative, and uncertain results mean, and how to plan safe trigger-free anesthesia.

RYR1 Genetic Test: Malignant Hyperthermia Risk and Anesthesia Results

Understand SLC6A4 genetic testing, 5-HTTLPR and rs25531 results, the evidence on SSRI response, why guidelines do not recommend stand-alone prescribing changes, and how to use findings safely.

SLC6A4 Genetic Test: Antidepressant Response, Serotonin Transporter, and Results

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