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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 27

Understand plasma histamine testing, including the short collection window, strict sample handling, causes of high results, and its role in anaphylaxis and mast cell activation evaluation.

Plasma Histamine Test: Mast Cell Activation, High Levels, Timing, and Meaning

Learn what a prostaglandin D2 urine metabolite test measures, how random and 24-hour collections differ, and what high, normal, or medication-affected results may mean.

Prostaglandin D2 Test: Mast Cell Activation, High Levels, and Meaning

Learn how a respiratory allergy panel tests specific IgE to pollen, mites, pets, molds, and other inhalants, and how results relate to rhinitis, asthma, cross-reactivity, and treatment.

Respiratory Allergy Panel: Inhalant Allergens, Specific IgE, Asthma, and Rhinitis

Understand shrimp, crab, lobster, and tropomyosin IgE testing, including cross-reactivity with mites, component results, oral challenges, and what positive or negative values mean.

Shellfish Allergy IgE Test: Shrimp, Crab, Lobster, Tropomyosin, and Allergy Risk

Learn how specific IgE blood tests identify allergen sensitization, what positive and negative values mean, when component testing helps, and how results guide allergy diagnosis.

Specific IgE Blood Test: Allergy Triggers, Positive Result, and Clinical Meaning

Learn what total IgE measures, why levels rise with allergy, eczema, asthma, parasites, or immune disorders, and how normal, high, and very high results are evaluated.

Total IgE Blood Test: High Levels, Allergy, Asthma, Parasites, and Immune...

Learn how acute and baseline tryptase tests are timed and compared, what high results can mean, and how tryptase supports evaluation of anaphylaxis, MCAS, hereditary alpha-tryptasemia, and mastocytosis.

Tryptase Blood Test: High Levels, Mast Cell Activation, Anaphylaxis, and Mastocytosis

Learn how wheat component IgE testing interprets omega-5 gliadin, Tri a 14, glutenins, cross-reactivity, and exercise-related anaphylaxis risk, and what positive or negative results can mean.

Wheat Component IgE Test: Wheat Allergy, Omega-5 Gliadin, and Exercise-Related Risk

Learn how the calcitonin blood test measures thyroid C-cell activity, why levels rise, how results relate to medullary thyroid cancer, and what follow-up may involve.

Calcitonin Blood Test: High Levels, Medullary Thyroid Cancer, C-Cells, and Results

Understand what a free T3 blood test measures, why levels may be high or low, how normal ranges vary, and when results help diagnose thyroid disease.

Free T3 (Free Triiodothyronine) Test: High, Low, Normal Range, and Thyroid...

Learn how a free T4 blood test helps identify hypothyroidism, hyperthyroidism, and pituitary disease, why ranges vary, and what high or low results may mean.

Free T4 (Free Thyroxine) Test: High, Low, Normal Range, and Thyroid...

Learn how the free thyroxine index combines total T4 and T3 uptake, what high or low FTI results suggest, and when binding proteins can affect interpretation.

Free Thyroxine Index (FTI) Test: Thyroid Function, T4 Binding, and Results

Understand the Graves disease blood test panel, including TSH, free T4, T3, TRAb, and TSI patterns used for diagnosis, treatment monitoring, and pregnancy care.

Graves Disease Blood Test Panel: TSH, Free T4, T3, TRAb, TSI,...

Understand the Hashimoto thyroiditis panel, including TSH, free T4, TPOAb, and TgAb patterns, what positive antibodies mean, and when treatment is needed.

Hashimoto Thyroiditis Blood Test Panel: TSH, Free T4, TPOAb, TgAb, and...

Understand a hyperthyroidism blood test panel, including low TSH, high T3 or T4, TRAb and TSI results, causes, interference, and follow-up.

Hyperthyroidism Blood Test Panel: Low TSH, T3, T4, TRAb, TSI, and...

Learn how high TSH, low or normal free T4, TPOAb, and TgAb results identify hypothyroidism, Hashimoto thyroiditis, treatment needs, and follow-up.

Hypothyroidism Blood Test Panel: High TSH, Free T4, TPOAb, TgAb, and...

Learn how neonatal TSH screening detects congenital hypothyroidism, why timing matters, what high or borderline results mean, and how babies are treated.

Neonatal TSH Test: Congenital Hypothyroidism, Newborn Thyroid Screening, and Results

Understand reverse T3 testing, including high and low results, assay ranges, illness effects, thyroid conversion claims, and why TSH and free T4 matter more.

Reverse T3 (rT3) Test: High, Low, Normal Range, and Thyroid Conversion

Learn what the T3 uptake test measures, why high or low results reflect TBG and hormone binding, how FTI is calculated, and which modern tests help.

T3 Uptake Test: Thyroid Hormone Binding, TBG, High and Low Results

Understand thyroglobulin testing after thyroid cancer, including high, low, or undetectable Tg, TSH stimulation, TgAb interference, trends, and imaging.

Thyroglobulin (Tg) Blood Test: Thyroid Cancer Follow-Up, High or Low Levels,...

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