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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 39

Learn how CYP2C9 test results affect warfarin, NSAIDs, and phenytoin, including metabolizer types, dose guidance, allele coverage, monitoring, and safety limits.

CYP2C9 Genetic Test: Warfarin, NSAIDs, Phenytoin, and Results

Understand CYP2C19 clopidogrel test results, loss-of-function alleles, Plavix response, alternatives after PCI, and cardiovascular risk implications.

CYP2C19 Clopidogrel Genetic Test: Plavix Response, Heart Risk, and Results

Understand CYP2C19 test results for clopidogrel, antidepressants, and PPIs, including metabolizer types, dosing implications, interactions, and limitations.

CYP2C19 Genetic Test: Clopidogrel, Antidepressants, PPIs, and Results

Understand CYP2D6 and CYP2C19 antidepressant test results, SSRI dosing implications, poor and rapid metabolizer findings, interactions, limits, and follow-up.

CYP2D6 and CYP2C19 Antidepressant Pharmacogenetic Test: SSRI Response and Results

Understand CYP2D6 genetic test results, poor and ultrarapid metabolizer meanings, copy-number issues, drug effects, phenoconversion, and safe clinical use.

CYP2D6 Genetic Test: Drug Metabolism, Poor Metabolizer, and Results

Understand CYP2D6 opioid test results for codeine, tramadol, and oxycodone, including poor and ultrarapid metabolism, interactions, safety, and limits.

CYP2D6 Opioid Pharmacogenetic Test: Codeine, Tramadol, Oxycodone, and Results

Learn what a CYP3A4 genetic test shows, how CYP3A4*22 affects drug metabolism, which medicines may be influenced, and how to interpret results safely.

CYP3A4 Genetic Test: Drug Metabolism, Variants, and Results

Understand CYP3A5 genetic test results, tacrolimus expresser status, genotype-guided starting doses, trough monitoring, and safe transplant medication use.

CYP3A5 Genetic Test: Tacrolimus Dosing, Metabolism, and Results

Learn how DPYD genetic test results, activity scores, and DPD deficiency affect 5-FU and capecitabine dosing, toxicity risk, monitoring, and urgent care.

DPYD Genetic Test: Fluoropyrimidine Toxicity, 5-FU, Capecitabine, and Results

Learn how fluoropyrimidine pharmacogenetic testing uses DPYD results to guide 5-FU and capecitabine starting doses, monitoring, toxicity prevention, and emergency care.

Fluoropyrimidine Pharmacogenetic Test: DPYD, 5-FU, Capecitabine Toxicity, and Results

Understand G6PD genetic testing, enzyme activity, medication hemolysis risk, result interpretation, test limitations, and safe next steps.

G6PD Genetic Test: Medication Hemolysis Risk, Deficiency, and Results

Learn how HLA-A*31:01 testing estimates carbamazepine hypersensitivity risk, how positive and negative results guide prescribing, and which symptoms need urgent care.

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

Understand HLA-B*15:02 testing for carbamazepine skin reaction risk, result interpretation, ancestry-based screening, related-drug choices, and urgent SJS/TEN warning signs.

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

Understand HLA-B*57:01 testing before abacavir, positive and negative result meaning, hypersensitivity symptoms, permanent rechallenge precautions, and HIV treatment alternatives.

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

Understand HTR2A antidepressant testing, common variants, evidence for response and side effects, report limitations, and why current guidelines recommend no HTR2A-based action.

HTR2A Genetic Test: Antidepressant Response, Side Effects, and Results

Understand what an IFNL3 or IL28B genetic test shows, how CC, CT, and TT results were used in older hepatitis C care, and why modern DAA treatment relies on other clinical tests.

IFNL3 Genetic Test: Hepatitis C Treatment Response and Results

Learn how NAT2 testing identifies slow, intermediate, or rapid isoniazid acetylator status, what the result may mean for TB treatment and toxicity, and why specialist monitoring remains essential.

NAT2 Genetic Test: Isoniazid Metabolism, Slow Acetylator Status, and Results

Understand NUDT15 test results, thiopurine leukopenia risk, and how normal, intermediate, or poor metabolizer status can affect mercaptopurine, azathioprine, and thioguanine starting doses.

NUDT15 Genetic Test: Thiopurine Toxicity, Leukopenia Risk, and Results

Understand what an OPRM1 genetic test shows, how AA, AG, and GG results relate to opioid response, why dosing guidance is limited, and how to use results safely.

OPRM1 Genetic Test: Opioid Response, Pain Treatment, and Results

Learn how pain medication pharmacogenetic testing uses CYP2D6, OPRM1, and related genes to clarify opioid response, codeine and tramadol risks, test results, and treatment choices.

Pain Medication Pharmacogenetic Test: Opioids, CYP2D6, OPRM1, and Results

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