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Understand ALK fusion testing in lung cancer, including what a positive or negative result means, tissue and ctDNA methods, limitations, and treatment relevance.

ALK Fusion Test for Lung Cancer: Gene Fusion, Positive Result, and Molecular Meaning

Understand BRAF V600E testing in lung cancer, including what a positive or negative result means, tissue and ctDNA methods, limitations, and treatment relevance.

BRAF V600E Test for Lung Cancer: Mutation Status, Positive Result, and Molecular Meaning

Learn how the carcinoembryonic antigen (CEA) test is used in lung cancer, what high levels can mean, common non-cancer causes, reference ranges, and why serial trends matter.

CEA Test for Lung Cancer: Tumor Marker Monitoring, High Levels, and Result Meaning

Learn how the cytokeratin 19 fragment 21-1 (CYFRA 21-1) test is used in lung cancer, what high levels can mean, common non-cancer causes, reference ranges, and why serial trends matter.

CYFRA 21-1 Test for Lung Cancer: Tumor Marker Levels and Disease Monitoring

Understand EGFR exon 20 insertion testing in lung cancer, including what a positive or negative result means, tissue and ctDNA methods, limitations, and treatment relevance.

EGFR Exon 20 Insertion Test: Lung Cancer Mutation Status and Molecular Meaning

Understand EGFR mutation testing in lung cancer, including what a positive or negative result means, tissue and ctDNA methods, limitations, and treatment relevance.

EGFR Mutation Test for Lung Cancer: Exon 19, L858R, T790M, Mutation Status, and...

Diagnostics

Home Diagnostics Page 23

Learn how to interpret high and low kappa/lambda ratios, kidney-adjusted ranges, MGUS, multiple myeloma biomarkers, amyloidosis, companion tests, and monitoring.

Kappa/Lambda Ratio Test: Abnormal Ratio, Multiple Myeloma, and Plasma Cell Disorders

Understand high lambda free light chains, kidney and inflammatory effects, low kappa/lambda ratio, monoclonal gammopathy, AL amyloidosis, confirmatory tests, and monitoring.

Lambda Light Chain Test: High Levels, Immune Protein, and Monoclonal Gammopathy

Understand mannose-binding lectin testing, low MBL results, lectin-pathway function, infection risk, immune deficiency evaluation, and treatment decisions.

Mannose-Binding Lectin Test: Immune Deficiency Risk, Infections, and Meaning

Understand pneumococcal antibody titers, pre- and post-vaccine testing, serotype IgG thresholds, immune response, antibody deficiency, and next steps.

Pneumococcal Antibody Titer Test: Vaccine Response, Immune Function, and Antibody Protection

Understand primary immunodeficiency blood testing, immunoglobulins, vaccine responses, lymphocyte subsets, complement, neutrophil function, genetics, and diagnosis.

Primary Immunodeficiency Blood Test Panel: Immunoglobulins, Complement, Lymphocytes, and Diagnosis

Understand SPEP patterns, M spikes, monoclonal and polyclonal gammopathy, immunoglobulin regions, MGUS, myeloma testing, interference, and follow-up.

Serum Protein Electrophoresis (SPEP) Test: Immunoglobulins, M Protein, and Monoclonal Gammopathy

Understand tetanus IgG antibody testing, protection thresholds, booster response, vaccine schedules, wound prophylaxis, low titers, immune deficiency, and next steps.

Tetanus Antibody Test: Vaccine Immunity, Protection Level, and Immune Response

Understand vaccine antibody titers, IgG and IgM results, protection cutoffs, vaccine records, hepatitis B, MMR, varicella, tetanus, pneumococcal response, and immune testing.

Vaccine Antibody Titer Test: Immune Protection, IgG Levels, and Vaccine Response

Learn how the ANA by IFA test reports titers and fluorescence patterns, what positive and negative results may mean, and which follow-up tests help assess autoimmune disease.

ANA by IFA Test: Titer, Pattern, Positive Result, and Autoimmune Disease...

Understand what an ANA ELISA screen measures, how positive, equivocal, and negative results are interpreted, how it differs from IFA, and when follow-up testing is needed.

ANA Screen by ELISA Test: Positive, Negative, Autoimmune Screening, and Limitations

Learn how an ANA with reflex test moves from autoimmune screening to titer, pattern, ENA antibodies, and targeted follow-up—and why panel design changes interpretation.

ANA With Reflex Test: Autoimmune Screening, ENA Antibody Panel, and Follow-Up...

Understand what a positive or negative antinuclear antibody test means, how ANA titer and pattern affect interpretation, and which follow-up tests may clarify autoimmune risk.

Antinuclear Antibody (ANA) Test: Positive, Negative, Titer, Pattern, and Autoimmune Meaning

Learn how an antiphospholipid antibody panel evaluates lupus anticoagulant, anticardiolipin, and beta-2 glycoprotein I antibodies in clotting risk, pregnancy loss, and APS diagnosis.

Antiphospholipid Antibody Panel: Clotting Risk, Pregnancy Loss, APS Diagnosis, and Meaning

Explore common autoantibody blood tests, what positive, negative, and borderline results mean, and how ANA, ENA, RF, anti-CCP, ANCA, and organ-specific markers guide diagnosis.

Autoantibody Blood Test Panel: Common Autoimmune Markers, Positive Results, and Disease...

Understand autoimmune blistering disease panels, including desmoglein, BP180, BP230, collagen VII, biopsy, and immunofluorescence findings used to diagnose pemphigus and pemphigoid.

Autoimmune Blistering Disease Antibody Panel: Skin Antibodies, Pemphigus, Pemphigoid, and Diagnosis

Learn how GAD65, IA-2, ZnT8, insulin, and islet cell antibodies help classify autoimmune diabetes, define early type 1 diabetes stages, and estimate progression risk.

Autoimmune Diabetes Antibody Panel: GAD65, IA-2, ZnT8, Insulin Antibodies, and Type...

Understand how ANA, ENA, CRP, ESR, CBC, complement, urinalysis, and targeted autoantibodies work together in an autoimmune disease blood test panel and diagnosis.

Autoimmune Disease Blood Test Panel: ANA, ENA, CRP, ESR, Autoantibodies, and...

Learn how autoimmune encephalitis antibody panels detect brain-directed antibodies, when serum and CSF testing are used, and what positive or negative results may mean.

Autoimmune Encephalitis Antibody Panel: Brain Antibodies, Neurologic Symptoms, and Diagnosis

Understand how AMA, SMA, LKM-1, ANA, SLA, and related antibodies help evaluate autoimmune hepatitis, primary biliary cholangitis, overlap disease, and abnormal liver tests.

Autoimmune Liver Disease Antibody Panel: AMA, SMA, LKM, ANA, and Liver...

Learn how autoimmune neurology panels test antibodies linked to brain, spinal cord, nerve, neuromuscular junction, and muscle disorders and how results are interpreted.

Autoimmune Neurology Antibody Panel: Nerve, Brain, Muscle Antibodies, Symptoms, and Diagnosis

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