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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

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Understand TSC1 and TSC2 genetic testing for tuberous sclerosis, including diagnostic results, VUS, negative tests, mosaicism, inheritance risk, and surveillance.

Tuberous Sclerosis Genetic Test: TSC1, TSC2 Genes, Risk, and Results

Understand Wilson disease ATP7B genetic testing and copper results, including ceruloplasmin, urine and liver copper, two variants, carrier findings, VUS, and family risk.

Wilson Disease Genetic Test: ATP7B Gene Mutations, Copper, and Results

Understand X-linked carrier screening, female carrier risk, inheritance for sons and daughters, test methods, result meanings, health follow-up, and pregnancy options.

X-Linked Carrier Screening Test: Female Carrier Risk and Results

Learn what an autoimmune disease genetic risk test measures, how HLA and immune-gene results are interpreted, and why positive or negative findings do not provide a diagnosis.

Autoimmune Disease Genetic Risk Test: HLA, Immune Genes, and Results

Learn how CVID genetic testing examines immune-disorder genes, what positive, negative, and uncertain results mean, and when a molecular diagnosis may change care.

Common Variable Immunodeficiency (CVID) Genetic Test: Immune Disorder Genes and Results

Learn how complement deficiency genetic testing evaluates immune-system genes, how CH50 and AH50 guide diagnosis, and what positive, negative, or uncertain results mean.

Complement Deficiency Genetic Test: Immune System Genes and Results

Learn how CDC, flow cytometry, and virtual crossmatch tests assess transplant compatibility, what a positive result means, and why donor-specific antibodies affect risk.

Crossmatch Test: Transplant Compatibility, Positive Result, and Meaning

Understand donor-specific antibody testing, including positive and negative DSA results, MFI, rejection risk, crossmatch findings, limitations, and follow-up after transplant.

Donor-Specific Antibody (DSA) Test: Transplant Rejection Risk and Results

Learn how MEFV testing supports familial Mediterranean fever diagnosis, including variants, carrier results, colchicine treatment, and amyloidosis risk.

Familial Mediterranean Fever Genetic Test: MEFV Gene, Inflammation, and Results

Understand hereditary angioedema genetic testing for SERPING1, F12, PLG, and other genes, including result meanings, inheritance, complement tests, and emergency care.

Hereditary Angioedema Genetic Test: SERPING1, F12, PLG, and Results

Understand HLA antibody testing, including PRA and cPRA, MFI, sensitization, donor-specific antibodies, transplant compatibility, limitations, and follow-up results.

HLA Antibody Test: Transplant Compatibility, PRA, and Results

Understand HLA matching for kidney, bone marrow, stem-cell, and organ transplant, including 6/6, 8/8, 10/10, haploidentical, mismatch, antibody, and crossmatch results.

HLA Matching Test: Kidney, Bone Marrow, Organ Transplant, and Results

Understand HLA typing methods, allele names, resolution, transplant matching, disease associations, drug-reaction risk, specimen issues, and result interpretation.

HLA Typing Test: Immune Matching, Transplant, Disease Risk, and Results

Understand HLA-A genetic testing, including allele names, tissue type, transplant matching, donor-specific antibodies, disease associations, drug risk, and result limitations.

HLA-A Genetic Test: Tissue Type, Transplant Matching, and Results

Understand HLA-A*31:01 testing for carbamazepine hypersensitivity, including positive and negative results, HLA-B*15:02 differences, drug decisions, and urgent symptoms.

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

Understand HLA-B genetic testing for tissue type, transplant matching, drug reaction alleles, HLA-B27 and HLA-B51 disease risk, result notation, and limitations.

HLA-B Genetic Test: Tissue Type, Drug Reaction Risk, and Results

Understand HLA-B27 testing for ankylosing spondylitis and axial spondyloarthritis, including positive and negative results, symptoms, imaging, related conditions, and next steps.

HLA-B27 Test: Ankylosing Spondylitis Risk, Positive Result, and Meaning

Understand HLA-B51 testing for Behçet disease risk, including positive and negative results, HLA-B5 differences, clinical diagnosis, symptoms, limitations, and next steps.

HLA-B51 Test: Behcet Disease Risk and Results

Understand HLA-B*15:02 testing before carbamazepine, including who needs it, positive and negative results, SJS/TEN risk, medication choices, and urgent rash signs.

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

Learn how HLA-B*57:01 testing prevents abacavir hypersensitivity, what positive and negative results mean, when to test, symptoms to recognize, and how results guide HIV treatment.

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

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