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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 30

Learn how RYR2 genetic testing supports CPVT diagnosis, what positive, negative, and uncertain results mean, and how findings guide treatment, exercise safety, and family screening.

Catecholaminergic Polymorphic Ventricular Tachycardia (CPVT) Genetic Test: RYR2 and Results

Learn how TTN, LMNA, and MYH7 genetic testing supports dilated cardiomyopathy diagnosis, how results influence rhythm and heart-failure care, and how families are screened.

Dilated Cardiomyopathy Genetic Test: TTN, LMNA, MYH7, and Results

Learn what the Factor V Leiden genetic test detects, how heterozygous and homozygous results affect venous clot risk, and when findings may influence treatment, pregnancy, estrogen, surgery, and family testing.

Factor V Leiden Genetic Test: Blood Clot Risk, Mutation, and Results

Learn when familial and early-onset atrial fibrillation genetic testing may help, how results can reveal cardiomyopathy risk, and why stroke prevention and rhythm treatment remain clinically based.

Familial Atrial Fibrillation Genetic Test: Heart Rhythm Risk and Results

Learn how LDLR, APOB, and PCSK9 genetic testing supports familial hypercholesterolemia diagnosis, what results mean, and how findings guide treatment and cascade screening in adults and children.

Familial Hypercholesterolemia Genetic Test: LDLR, APOB, PCSK9, and Results

Learn how LMNA and PPARG genetic testing supports familial partial lipodystrophy diagnosis, how subtypes differ, and how results guide metabolic, liver, cardiac, and family care.

Familial Partial Lipodystrophy Genetic Test: LMNA, PPARG, and Results

Learn how the GCK-MODY genetic test confirms lifelong mild fasting hyperglycemia, why most people need no medication, and how fetal inheritance changes pregnancy management.

GCK MODY Genetic Test: Mild Fasting Hyperglycemia, Diagnosis, and Results

Learn what a gout genetic risk test can reveal about SLC2A9, ABCG2, uric acid handling, polygenic risk, HLA-B*58:01, diagnosis, and treatment.

Gout Genetic Risk Test: Uric Acid Genes, SLC2A9, ABCG2, and Results

Understand HFE C282Y and H63D genetic test results, penetrance, iron studies, organ assessment, phlebotomy treatment, and family screening for hereditary hemochromatosis.

Hereditary Hemochromatosis Genetic Test: HFE C282Y, H63D, and Results

Learn how ENG, ACVRL1, and SMAD4 HHT genetic test results guide diagnosis, AVM screening, bleeding care, anemia treatment, family testing, and SMAD4 surveillance.

Hereditary Hemorrhagic Telangiectasia Genetic Test: ENG, ACVRL1, SMAD4, and Results

Understand HNF1A MODY genetic test results, diagnostic clues, sulfonylurea sensitivity, insulin transitions, pregnancy care, complications, and family testing.

HNF1A MODY Genetic Test: Diabetes Diagnosis, Treatment, and Results

Understand HNF4A-MODY genetic testing, who should be tested, how positive and uncertain results are interpreted, and how diagnosis can guide diabetes treatment, pregnancy care, and family screening.

HNF4A MODY Genetic Test: Diabetes Diagnosis, Treatment, and Results

Learn how MYH7, MYBPC3, and other hypertrophic cardiomyopathy genetic test results are interpreted and how they guide family screening, surveillance, and clinical care.

Hypertrophic Cardiomyopathy Genetic Test: MYH7, MYBPC3, and Results

Understand what an LDLR genetic test can reveal about familial hypercholesterolemia, how results are classified, and how testing can guide early treatment and family screening.

LDLR Genetic Test: Familial Hypercholesterolemia Risk and Results

Learn what a Loeys-Dietz syndrome genetic test checks, how TGFBR1, TGFBR2, and SMAD3 results are interpreted, and how findings affect imaging and family care.

Loeys-Dietz Syndrome Genetic Test: TGFBR1, TGFBR2, SMAD3, and Results

Understand what KCNQ1, KCNH2, and SCN5A genetic test results mean, how they relate to QTc findings, and how long QT syndrome testing guides treatment and family screening.

Long QT Syndrome Genetic Test: KCNQ1, KCNH2, SCN5A, and Results

Learn how LPA gene variants influence lipoprotein(a), why a blood Lp(a) test is usually preferred, how results are interpreted, and what high levels mean for heart risk.

LPA Genetic Test: Lipoprotein(a) [Lp(a)], Heart Risk, and Results

Learn when MODY genetic testing is appropriate, how GCK, HNF1A, HNF4A, and HNF1B results are interpreted, and how a diagnosis can change diabetes treatment and family care.

Maturity-Onset Diabetes of the Young (MODY) Genetic Test: Monogenic Diabetes Genes,...

Understand how mitochondrial diabetes genetic testing detects mtDNA variants such as m.3243A>G, why urine testing may be needed, and how results affect diabetes and family care.

Mitochondrial Diabetes Genetic Test: mtDNA Variants and Results

Learn how mitochondrial disease genetic testing evaluates mtDNA and nuclear genes, why tissue and heteroplasmy matter, and how positive, uncertain, and negative results are interpreted.

Mitochondrial Disease Genetic Test: mtDNA, Nuclear Genes, and Results

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