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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

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Learn how Edwards syndrome genetic testing screens for and diagnoses trisomy 18, how results are reported, and what they mean for care and recurrence.

Edwards Syndrome Genetic Test: Trisomy 18 Screening, Diagnosis, and Results

Understand embryo genetic testing in IVF, including PGT-A, PGT-M, PGT-SR, biopsy, mosaic results, limitations, embryo transfer, and prenatal confirmation.

Embryo Genetic Testing: IVF, Chromosomes, Mutations, and Results

Understand fetal aneuploidy testing for trisomy, monosomy, chromosome risk, screening results, diagnostic confirmation, mosaicism, and next steps.

Fetal Aneuploidy Test: Trisomy, Monosomy, Chromosome Risk, and Results

Understand first-trimester screening for Down syndrome risk, including PAPP-A, hCG, nuchal translucency, result ratios, limitations, and follow-up options.

First-Trimester Screening Test: Down Syndrome Risk, PAPP-A, hCG, and Results

Understand infertility karyotype testing, including chromosome abnormalities, male and female findings, result notation, limitations, and reproductive options.

Karyotype Test for Infertility: Chromosome Abnormalities and Results

Understand Klinefelter syndrome genetic testing, including 47,XXY and mosaic results, prenatal confirmation, hormone follow-up, fertility options, and next steps.

Klinefelter Syndrome Genetic Test: XXY Chromosomes, Diagnosis, and Results

Learn how the maternal serum AFP test screens for open neural tube defects, how MoM results are calculated, why AFP may be high, and what follow-up involves.

Maternal Serum AFP Test: Neural Tube Defect Risk and Pregnancy Results

Understand newborn cystic fibrosis screening, including IRT, CFTR variant results, sweat chloride confirmation, carrier findings, and CRMS/CFSPID follow-up.

Newborn Cystic Fibrosis Screening Test: IRT, CFTR, and Results

Understand newborn SCID screening, including TREC results, causes of low T cells, confirmatory flow cytometry, urgent precautions, genetic testing, and treatment.

Newborn SCID Screening Test: TREC, Immune Deficiency, and Results

Understand newborn screening for inherited metabolic disorders, including blood-spot markers, abnormal results, time-critical follow-up, confirmatory tests, and genetics.

Newborn Screening Genetic Test: Inherited Metabolic Disorders and Results

Understand newborn SMA screening, SMN1 and SMN2 results, confirmatory testing, early treatment decisions, missed variants, and family planning after an abnormal result.

Newborn SMA Screening Test: SMN1 Gene, Early Diagnosis, and Results

Learn how NIPT screens for trisomy 21, trisomy 18, and trisomy 13, what low-risk, high-risk, and no-call results mean, and when diagnostic testing is needed.

Noninvasive Prenatal Testing (NIPT): Trisomy 21, Trisomy 18, Trisomy 13, and...

Learn how a parental karyotype test can identify balanced translocations and other chromosome changes linked to infertility, recurrent miscarriage, and pregnancy risk.

Parental Karyotype Test: Infertility, Miscarriage, Translocations, and Results

Understand Patau syndrome genetic testing, including trisomy 13 screening, CVS and amniocentesis diagnosis, result interpretation, prognosis, and recurrence risk.

Patau Syndrome Genetic Test: Trisomy 13 Screening, Diagnosis, and Results

Learn how PGT works in IVF, including PGT-A, PGT-M, and PGT-SR, embryo biopsy, result terms, limitations, transfer decisions, costs, and prenatal follow-up.

Preimplantation Genetic Testing (PGT): IVF Embryo Testing and Results

Explore how PGT-A screens IVF embryos for chromosome abnormalities, what euploid, aneuploid, mosaic, and no-result findings mean, and where evidence and limits apply.

Preimplantation Genetic Testing for Aneuploidy (PGT-A): Embryo Chromosomes and Results

Learn how PGT-M tests IVF embryos for a known inherited disease, including assay development, linkage, affected and carrier results, limitations, and prenatal confirmation.

Preimplantation Genetic Testing for Monogenic Disease (PGT-M): Inherited Disease and Results

Understand how PGT-SR tests IVF embryos from translocation or inversion carriers, including normal, balanced, unbalanced, mosaic, and inconclusive results.

Preimplantation Genetic Testing for Structural Rearrangements (PGT-SR): Translocations and Results

Prenatal chromosomal microarray testing detects fetal chromosome deletions and duplications. Learn when CMA is used, how results and VUS are interpreted, and its limits.

Prenatal Chromosomal Microarray Test: Deletions, Duplications, and Results

Prenatal exome sequencing can diagnose single-gene causes of fetal anomalies. Learn who may be offered testing, diagnostic yield, result types, limits, and next steps.

Prenatal Exome Sequencing Test: Fetal Anomalies, Genetic Diagnosis, and Results

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