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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 hereditary pancreatitis genetic testing for PRSS1, SPINK1, CFTR, and CTRC, including positive, negative, uncertain, family, and cancer-risk results.

Hereditary Pancreatitis Genetic Test: PRSS1, SPINK1, CFTR, CTRC, and Results

Understand the Huntington disease HTT CAG repeat test, including normal, intermediate, reduced-penetrance, positive, predictive, family, and reproductive results.

Huntington Disease Genetic Test: HTT Gene CAG Repeats, Risk, and Results

Understand MSUD genetic testing for BCKDHA, BCKDHB, and DBT, including newborn screening, two-variant diagnosis, carrier risk, VUS, and emergency care.

Maple Syrup Urine Disease Genetic Test: BCKDHA, BCKDHB, DBT, and Results

Understand FBN1 genetic testing for Marfan syndrome, including clinical criteria, positive, negative, and VUS results, aortic care, family risk, and pregnancy.

Marfan Syndrome Genetic Test: FBN1 Gene Mutations, Risk, and Results

Understand ACADM genetic testing for MCAD deficiency, including newborn screening, c.985A>G, positive, carrier, VUS, negative results, fasting, and family risk.

Medium-Chain Acyl-CoA Dehydrogenase (MCAD) Deficiency Genetic Test: ACADM Gene and Results

Understand NF1 genetic testing, including revised diagnostic criteria, mosaic and RNA testing, positive, negative, and VUS results, tumor warning signs, and family risk.

Neurofibromatosis Type 1 Genetic Test: NF1 Gene Mutations and Results

NF2 genetic testing explained: NF2-related schwannomatosis, mosaic and tumor testing, result interpretation, surveillance, hearing care, and family risk.

Neurofibromatosis Type 2 Genetic Test: NF2 Gene Mutations and Results

Learn how SMPD1, NPC1, and NPC2 genetic testing identifies Niemann-Pick disease, what positive, carrier, negative, and uncertain results mean, and which follow-up tests may be needed.

Niemann-Pick Disease Genetic Test: SMPD1, NPC1, NPC2 Genes, and Results

Understand how COL1A1 and COL1A2 genetic testing confirms osteogenesis imperfecta, how positive, negative, and uncertain results are interpreted, and what they mean for family risk and care.

Osteogenesis Imperfecta Genetic Test: COL1A1, COL1A2 Genes, and Results

Learn how pan-ethnic carrier screening tests common inherited disorders, how positive and negative results affect couple risk, and what partner testing and reproductive options may follow.

Pan-Ethnic Carrier Screening Test: Common Genetic Disorders and Results

Learn how PAH genetic testing confirms phenylketonuria, how positive, carrier, negative, and uncertain results are interpreted, and why blood phenylalanine still guides treatment.

Phenylketonuria (PKU) Genetic Test: PAH Gene Mutations and Results

Learn how PKD1 and PKD2 genetic testing confirms ADPKD, explains inheritance, clarifies uncertain results, and guides family testing and kidney follow-up.

Polycystic Kidney Disease Genetic Test: PKD1, PKD2 Genes, and Results

Understand GAA genetic testing for Pompe disease, including enzyme confirmation, carrier risk, pseudodeficiency, newborn screening, and positive or uncertain results.

Pompe Disease Genetic Test: GAA Gene Mutations, Carrier Risk, and Results

Learn how primary ciliary dyskinesia genetic testing identifies ciliary gene variants, works with nasal nitric oxide and microscopy, and explains family risk.

Primary Ciliary Dyskinesia Genetic Test: Ciliary Gene Mutations and Results

Understand retinitis pigmentosa genetic testing, inherited retinal disease genes, inheritance patterns, syndromic risks, and positive or uncertain results.

Retinitis Pigmentosa Genetic Test: Inherited Eye Disease Genes and Results

Learn how HBB genetic testing distinguishes sickle cell trait from HbSS, HbSC, and sickle beta-thalassemia and clarifies newborn and family results.

Sickle Cell Genetic Test: HBB Gene, Trait, Disease, and Results

Understand SMA carrier testing, including SMN1 copy number, 2+0 silent carriers, duplication markers, residual risk, partner testing, and prenatal results.

Spinal Muscular Atrophy (SMA) Carrier Test: SMN1 Gene, Copy Number, and...

Understand standard carrier screening for cystic fibrosis, SMA, and Fragile X, including test methods, result categories, residual risk, partner testing, and reproductive follow-up.

Standard Carrier Screening Panel: Cystic Fibrosis, SMA, Fragile X, and Results

Learn how ABCA4 genetic testing confirms Stargardt disease, how to interpret two variants, one variant, VUS, negative results, phase, prognosis, and family risk.

Stargardt Disease Genetic Test: ABCA4 Gene Mutations and Results

Understand Tay-Sachs carrier testing with HEXA gene and Hex A enzyme analysis, including pseudodeficiency, B1 variants, pregnancy specimens, results, and partner risk.

Tay-Sachs Disease Carrier Test: HEXA Gene, Enzyme, and Results

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