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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 19

Understand how CRP, ESR, CBC, ferritin, iron studies, and immune markers work together to assess chronic inflammation, interpret common patterns, and guide follow-up testing.

Chronic Inflammation Blood Test Panel: CRP, ESR, CBC, Ferritin, and Immune...

Learn what a CRP blood test measures, normal ranges and units, common causes of high levels, standard versus hs-CRP, and how trends guide inflammation care.

C-Reactive Protein (CRP) Test: Normal Range, High Levels, Causes, and Inflammation...

Learn how the ESR blood test works, normal ranges by age and sex, causes of high and low results, ESR versus CRP, and when follow-up is needed.

Erythrocyte Sedimentation Rate (ESR) Test: Normal Range, High Levels, and Inflammation...

Understand fecal calprotectin normal and high ranges, IBD versus IBS use, causes of elevation, stool collection, medication effects, monitoring, and follow-up.

Fecal Calprotectin Test: Gut Inflammation, IBD, Normal Range, and High Levels

Understand what a high ferritin blood test can mean, how inflammation can mask iron deficiency, and how clinicians assess iron overload, liver disease, and related causes.

Ferritin Blood Test: High Levels, Iron Stores, Inflammation, and What It...

Learn what a high fibrinogen blood test means, how inflammation affects it, and why the result is associated with clotting and cardiovascular risk without diagnosing a clot.

Fibrinogen Blood Test: High Levels, Inflammation, Clotting Risk, and Cardiovascular Meaning

Learn what a high globulin blood test means, how inflammation and immune activity affect protein balance, and when electrophoresis or monoclonal protein testing may be needed.

Globulin Blood Test: High Levels, Inflammation, Immune Activity, and Protein Balance

Understand what high and low haptoglobin blood test results mean, how inflammation can mask hemolysis, and which companion tests help identify red blood cell destruction.

Haptoglobin Blood Test: High Levels, Inflammation, Hemolysis, and Meaning

Learn what an hs-CRP test measures, how to interpret heart-risk ranges, why levels rise, when to repeat testing, and how to reduce cardiovascular risk.

High-Sensitivity C-Reactive Protein (hs-CRP) Test: Heart Disease Risk, Inflammation, and Meaning

Compare CRP, ESR, ferritin, and fibrinogen in an inflammatory marker panel, including their timing, limitations, chronic inflammation meaning, and useful next steps.

Inflammatory Marker Panel: CRP, ESR, Ferritin, Fibrinogen, and Chronic Inflammation

Learn what a high fecal lactoferrin test means, how it detects gut neutrophil inflammation, and how clinicians distinguish IBD, infection, and noninflammatory bowel symptoms.

Lactoferrin Test: Gut Inflammation, Infection, IBD, and High Levels

Understand a high neutrophil count, including ANC, infection and inflammation patterns, steroid and stress effects, left shift, and signs that need further blood evaluation.

Neutrophil Count Test: High Levels, Infection, Inflammation, and Immune Response

Understand what the neutrophil-to-lymphocyte ratio means, why NLR may be high, how inflammation and immune stress affect it, and why context matters.

Neutrophil-to-Lymphocyte Ratio (NLR) Test: Inflammation, Immune Stress, High Ratio, and Meaning

Learn what a plasma viscosity test measures, why levels may be high, how it compares with CRP and ESR, and when “thick blood” may signal an emergency.

Plasma Viscosity Test: High Levels, Inflammation, Blood Thickness, and Meaning

Understand how the platelet-to-lymphocyte ratio is calculated, what a high PLR may mean, why cutoffs vary, and how inflammation and immune changes affect it.

Platelet-to-Lymphocyte Ratio (PLR) Test: Inflammation, Immune Balance, High Ratio, and Meaning

Learn how the procalcitonin test supports bacterial infection and sepsis assessment, what high and low levels mean, and how trends can guide antibiotics.

Procalcitonin Test: Bacterial Infection, Sepsis Risk, High Levels, and Interpretation

Learn what a serum amyloid A test measures, why SAA rises in acute inflammation, how it tracks disease activity, and when persistent elevation raises AA amyloidosis concern.

Serum Amyloid A (SAA) Test: Acute Inflammation, High Levels, and Disease...

Understand what a WBC count measures, why white blood cells rise with infection, inflammation, stress, medicines, or blood disorders, and how results are evaluated.

White Blood Cell (WBC) Count Test: High Levels, Infection, Inflammation, and...

Learn how HLA-DR and CD38 flow cytometry measures activated T cells, what high results may mean, why ranges vary, and how clinicians plan follow-up.

Activated T-Cell Marker Test: HLA-DR, CD38, Immune Activation, and Inflammation

Understand how CD19 and CD20 B-cell counts are measured, why results may be high or low, how anti-CD20 therapy affects them, and which follow-up tests assess antibody function.

B-Cell Count Test: CD19, CD20, Immune Function, and Antibody Production

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