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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 congenital myasthenic syndrome genetic panels, neuromuscular junction genes, result categories, inheritance, and why the exact subtype can change treatment.

Congenital Myasthenic Syndrome Genetic Test: Neuromuscular Junction Genes and Results

Understand CYP2D6 and CYP2C19 antidepressant pharmacogenetic results, metabolizer phenotypes, drug interactions, dosing implications, and test limitations.

CYP2D6 and CYP2C19 Psychiatric Medication Pharmacogenetic Test: Antidepressant Results

Learn how developmental delay genetic testing uses microarray, exome, genome, Fragile X, and targeted tests, and how to interpret positive, negative, and uncertain results.

Developmental Delay Genetic Test: DNA Variants, Diagnosis, and Results

Understand SCN1A genetic testing for Dravet syndrome, including who should be tested, variant results, treatment implications, inheritance, mosaicism, and negative tests.

Dravet Syndrome Genetic Test: SCN1A Gene Mutations and Results

Understand DMD genetic testing for Duchenne muscular dystrophy, including exon deletions, duplications, sequencing, reading-frame results, treatment eligibility, and carrier risk.

Duchenne Muscular Dystrophy Genetic Test: DMD Gene, Deletions, and Results

Learn how epilepsy genetic panel testing evaluates seizure genes, who benefits, how to interpret positive, uncertain, and negative results, and when findings can guide treatment.

Epilepsy Genetic Panel Test: Seizure Genes, Diagnosis, and Results

Understand FSHD genetic testing, including D4Z4 repeat size, permissive 4qA haplotypes, SMCHD1, methylation, FSHD1 versus FSHD2, mosaicism, and results.

Facioscapulohumeral Muscular Dystrophy Genetic Test: D4Z4 Repeat, SMCHD1, and Results

Understand Fragile X FMR1 testing, CGG repeat ranges, methylation, mosaicism, autism-related features, premutation risks, AGG interruptions, and family results.

Fragile X Genetic Test: FMR1 CGG Repeats, Autism, and Results

Understand Friedreich ataxia genetic testing, FXN GAA repeat ranges, positive and carrier results, inheritance, limitations, and follow-up care.

Friedreich Ataxia Genetic Test: FXN Gene, GAA Repeats, and Results

Learn how MAPT, GRN, and C9orf72 testing is used in frontotemporal dementia, what positive or uncertain results mean, and how relatives are affected.

Frontotemporal Dementia Genetic Test: MAPT, GRN, C9orf72, and Results

Understand GBA genetic testing for Parkinson disease risk and Gaucher disease, including methods, variant results, inheritance, limitations, and follow-up.

GBA Genetic Test: Parkinson Disease Risk, Gaucher Disease, and Results

Learn how hereditary ataxia genetic testing detects SCA genes and repeat expansions, what positive, negative, and uncertain results mean, and when broader testing helps.

Hereditary Ataxia Genetic Test: Spinocerebellar Ataxia Genes and Results

Understand hereditary spastic paraplegia genetic testing, including common HSP genes, panel and genome methods, result meanings, inheritance, mimics, and follow-up.

Hereditary Spastic Paraplegia Genetic Test: Spasticity Genes and Results

Learn how the Huntington disease genetic test measures HTT CAG repeats, what each result range means, and how predictive testing, inheritance, and follow-up work.

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

Understand genetic testing for intellectual disability, including chromosomal microarray, exome sequencing, result types, limitations, and next steps.

Intellectual Disability Genetic Test: Chromosomal Microarray, Exome Sequencing, and Results

Learn how limb-girdle muscular dystrophy genetic testing evaluates muscle disease genes, interprets results, distinguishes mimics, and guides care.

Limb-Girdle Muscular Dystrophy Genetic Test: Muscle Disease Genes and Results

Understand LRRK2 genetic testing for Parkinson disease, including pathogenic variants, penetrance, family risk, uncertain results, and clinical next steps.

LRRK2 Genetic Test: Parkinson Disease Risk and Results

Learn how malignant hyperthermia genetic testing evaluates RYR1 and CACNA1S, what results mean, why negative tests can miss risk, and how to plan safe anesthesia.

Malignant Hyperthermia Genetic Test: RYR1, CACNA1S, Anesthesia Risk, and Results

Learn how DMPK and CNBP repeat-expansion tests diagnose myotonic dystrophy types 1 and 2, explain result ranges, inheritance, limitations, and medical follow-up.

Myotonic Dystrophy Genetic Test: DMPK, CNBP Repeat Expansions, and Results

Understand how neurologic genetic panels test brain, nerve, and muscle genes, what positive, VUS, carrier, and negative results mean, and when other tests are needed.

Neurologic Genetic Panel Test: Brain, Nerve, Muscle Genes, and Results

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