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Learn how lung cancer MRD ctDNA testing detects molecular residual disease, what positive and negative results mean, how it can precede recurrence on scans, and why treatment decisions still require clinical context.

Minimal Residual Disease ctDNA Test for Lung Cancer: Recurrence Monitoring, MRD, and Tumor DNA

Learn what MSI testing means in lung cancer, how MSI-H, MSS, dMMR, and pMMR results differ, how NGS, PCR, and IHC are used, and why this rare biomarker can matter for immunotherapy and hereditary evaluation.

MSI Test for Lung Cancer: Microsatellite Instability, Mismatch Repair, and Result Meaning

Learn how Napsin A IHC supports lung adenocarcinoma diagnosis, what positive granular cytoplasmic staining means, why negative results do not exclude lung cancer, and when other tumor origins must be considered.

Napsin A IHC Test for Lung Cancer: Adenocarcinoma Marker, Tumor Origin, and Positive...

Non-Small Cell Lung Cancer Biomarker Test: Driver Mutations, PD-L1, and Molecular Profile

Learn what an NSE blood test means in small cell lung cancer, why levels can be high, how hemolysis causes false elevations, and how serial NSE trends may support treatment and recurrence monitoring.

NSE Test for Lung Cancer: Small Cell Lung Cancer Marker, High Levels, and...

Understand NTRK fusion testing in lung cancer, including tumor-agnostic meaning, RNA NGS, pan-TRK IHC, positive results, negative-result limits, and next steps.

NTRK Fusion Test for Lung Cancer: Gene Fusion, Tumor-Agnostic Marker, and Molecular Meaning

Diagnostics

Home Diagnostics Page 14

Understand cryoglobulin test results, warm collection, types I–III, low C4, hepatitis C links, vasculitis symptoms, and key follow-up tests.

Cryoglobulin Test: Vasculitis, Cold-Sensitive Antibodies, Hepatitis C, and Meaning

Understand eosinophil count ranges, common causes of high eosinophils, parasite and allergy clues, EGPA warning signs, and the follow-up tests that may be needed.

Eosinophil Count Test: EGPA, Allergy, Parasites, and High Eosinophils

Learn how an EGPA blood test panel uses ANCA, MPO antibodies, eosinophils, IgE, CRP, ESR, urine tests, and organ screening to support diagnosis.

Eosinophilic Granulomatosis With Polyangiitis Blood Test Panel: ANCA, Eosinophils, IgE, and...

Understand the GBM antibody panel for lung-kidney syndrome, including anti-GBM results, ANCA overlap, kidney and lung tests, biopsy findings, and urgent next steps.

GBM Antibody Panel: Lung-Kidney Syndrome, Vasculitis, and Diagnosis

Learn how PR3-ANCA, MPO-ANCA, CRP, ESR, kidney tests, urinalysis, imaging, and biopsy work together in GPA diagnosis and disease-activity monitoring.

Granulomatosis With Polyangiitis Blood Test Panel: PR3-ANCA, CRP, ESR, and Disease...

Understand what a positive or negative HLA-B51 test means, how it affects Behçet disease risk, and why symptoms—not genetics alone—determine diagnosis.

HLA-B51 Test: Behçet Disease Risk, Positive Result, and Meaning

Learn what high or normal serum IgA means in IgA vasculitis and why urine protein, blood pressure, creatinine, and eGFR determine kidney risk.

IgA Blood Test for IgA Vasculitis: High Levels, Kidney Risk, and...

Understand high, normal, and borderline IgG4 blood results, how IgG4-related disease affects organs, and why imaging and biopsy often determine diagnosis.

IgG4 Blood Test: IgG4-Related Disease, Inflammation, and Organ Involvement

Understand how CRP, ESR, IL-6, blood counts, and imaging are used to diagnose and monitor giant cell arteritis and Takayasu arteritis.

Large Vessel Vasculitis Blood Test Panel: CRP, ESR, IL-6, and Disease...

Learn how MPO-ANCA, CRP, ESR, urine testing, creatinine, and kidney biopsy are combined to diagnose microscopic polyangiitis and assess kidney risk.

Microscopic Polyangiitis Blood Test Panel: MPO-ANCA, CRP, ESR, and Kidney Risk

Understand positive, negative, and borderline MPO-ANCA results, their links to MPA and EGPA, and the organ tests needed to confirm active vasculitis.

MPO-ANCA Antibody Test: MPA, EGPA, Vasculitis, Positive Result, and Meaning

Learn what a p-ANCA pattern means, how it differs from MPO-ANCA, and when results support microscopic polyangiitis versus bowel, liver, drug, or infection causes.

p-ANCA Test: Microscopic Polyangiitis, MPO Antibodies, and Meaning

Understand positive, negative, and changing PR3-ANCA results, their link to GPA, and why organ testing—not the antibody number alone—determines urgency.

PR3-ANCA Antibody Test: GPA Vasculitis, Positive Result, and Meaning

Understand what high or normal soluble IL-2 receptor means in sarcoidosis and why immune activation, lymphoma, infection, kidney function, imaging, and biopsy affect interpretation.

Soluble IL-2 Receptor Test: Sarcoidosis, Immune Activation, and Inflammation

Learn how ANCA, MPO, PR3, CRP, ESR, complement, urine tests, imaging, and biopsy work together in a focused vasculitis diagnostic evaluation.

Vasculitis Blood Test Panel: ANCA, MPO, PR3, CRP, ESR, Complement, and...

Understand the 14-3-3 eta protein test, including what it measures, positive and negative results, diagnostic limits, rheumatoid arthritis risk, and appropriate follow-up.

14-3-3 Eta Protein Test: Rheumatoid Arthritis, Joint Damage Risk, and Disease...

Understand the ankylosing spondylitis blood test panel, including what it measures, positive and negative results, diagnostic limits, rheumatoid arthritis risk, and appropriate follow-up.

Ankylosing Spondylitis Blood Test Panel: HLA-B27, CRP, ESR, and Diagnosis

Understand the anti-carbamylated protein (anti-CarP) antibody test, including what it measures, positive and negative results, diagnostic limits, rheumatoid arthritis risk, and appropriate follow-up.

Anti-Carbamylated Protein (Anti-CarP) Test: Rheumatoid Arthritis Marker and Prognosis

Understand the anti-CCP antibody test, including what it measures, positive and negative results, diagnostic limits, rheumatoid arthritis risk, and appropriate follow-up.

Anti-CCP Antibody Test: Rheumatoid Arthritis Diagnosis, Positive Result, and Prognosis

Understand the anti-citrullinated protein antibody (ACPA) test, including what it measures, positive and negative results, diagnostic limits, rheumatoid arthritis risk, and appropriate follow-up.

Anti-Citrullinated Protein Antibody (ACPA) Test: Rheumatoid Arthritis Diagnosis and Disease Risk

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