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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 19

Prenatal genetic screening estimates the chance of chromosome conditions. Compare cfDNA, serum, and ultrasound screening, understand results, and learn when diagnosis is needed.

Prenatal Genetic Screening Test: Chromosome Conditions, Risk, and Results

A prenatal karyotype diagnoses chromosome number and structural abnormalities. Learn how CVS or amniocentesis results are written, what mosaicism means, and when other tests are needed.

Prenatal Karyotype Test: Chromosome Abnormalities and Results

Prenatal 22q11.2 microdeletion testing may be screening or diagnostic. Learn how cfDNA differs from microarray, how positives are confirmed, and what a deletion can mean.

Prenatal Microdeletion Test: 22q11.2 Deletion, Risk, and Results

POC genetic testing can identify chromosome causes of miscarriage. Learn how tissue is collected, why maternal contamination matters, how microarray results are read, and what comes next.

Products of Conception (POC) Genetic Test: Miscarriage Chromosome Results

Understand recurrent pregnancy loss genetic testing, including miscarriage-tissue analysis, parental karyotypes, translocations, result meanings, and reproductive options.

Recurrent Pregnancy Loss Genetic Test: Karyotype, Translocations, and Results

Learn how the second-trimester quad screen uses AFP, hCG, estriol, and inhibin A, what positive and negative results mean, and which follow-up tests may be offered.

Second-Trimester Quad Screen Test: AFP, hCG, Estriol, Inhibin A, and Results

Understand sex chromosome aneuploidy testing for 45,X, XXY, XXX, XYY, and mosaic results, including prenatal screening accuracy, diagnostic confirmation, and clinical meaning.

Sex Chromosome Aneuploidy Test: X and Y Chromosome Results

Learn how Turner syndrome testing detects 45,X, mosaic, and structural X results, why cfDNA screening needs confirmation, and what diagnosis means before and after birth.

Turner Syndrome Genetic Test: Monosomy X Screening, Diagnosis, and Results

Understand Y-chromosome microdeletion testing for male infertility, including AZFa, AZFb, and AZFc results, sperm retrieval prognosis, ICSI inheritance, and next steps.

Y-Chromosome Microdeletion Test: Male Infertility, AZF Regions, and Results

Learn how HLA, CYP2C9, and CYP2C19 anticonvulsant pharmacogenetic test results may affect carbamazepine, phenytoin, clobazam, skin-reaction risk, dosing, and follow-up.

Anticonvulsant Pharmacogenetic Test: HLA, CYP2C9, CYP2C19, and Results

Understand how a BCHE genetic test, pseudocholinesterase activity, and dibucaine number reveal prolonged succinylcholine or mivacurium paralysis risk and guide safer anesthesia.

BCHE Genetic Test: Pseudocholinesterase Deficiency, Anesthesia Risk, and Results

Understand what CACNA1S genetic test results mean for malignant hyperthermia risk, trigger-free anesthesia, contracture testing, and family screening.

CACNA1S Genetic Test: Malignant Hyperthermia Risk and Results

Learn how DPYD, UGT1A1, TPMT, and NUDT15 results can guide fluoropyrimidine, irinotecan, and thiopurine dosing and toxicity prevention.

Chemotherapy Pharmacogenetic Test: DPYD, UGT1A1, TPMT, and Results

Understand COMT Val158Met results, dopamine metabolism, pain research, medication-response evidence, and why most COMT claims are not clinically actionable.

COMT Genetic Test: Dopamine Metabolism, Pain, Medication Response, and Results

Understand CYP1A2 genetic test results for caffeine and clozapine, including why smoking, inflammation, interactions, and drug levels often matter more.

CYP1A2 Genetic Test: Caffeine, Clozapine, Drug Metabolism, and Results

Understand CYP2B6 test results for efavirenz, methadone, and bupropion, including metabolizer phenotypes, drug-specific guidance, and test limitations.

CYP2B6 Genetic Test: Efavirenz, Methadone, Bupropion, and Results

Learn how CYP2C9 test results affect warfarin, NSAIDs, and phenytoin, including metabolizer types, dose guidance, allele coverage, monitoring, and safety limits.

CYP2C9 Genetic Test: Warfarin, NSAIDs, Phenytoin, and Results

Understand CYP2C19 clopidogrel test results, loss-of-function alleles, Plavix response, alternatives after PCI, and cardiovascular risk implications.

CYP2C19 Clopidogrel Genetic Test: Plavix Response, Heart Risk, and Results

Understand CYP2C19 test results for clopidogrel, antidepressants, and PPIs, including metabolizer types, dosing implications, interactions, and limitations.

CYP2C19 Genetic Test: Clopidogrel, Antidepressants, PPIs, and Results

Understand CYP2D6 and CYP2C19 antidepressant test results, SSRI dosing implications, poor and rapid metabolizer findings, interactions, limits, and follow-up.

CYP2D6 and CYP2C19 Antidepressant Pharmacogenetic Test: SSRI Response and Results

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