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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 13

Understand what the Prostate Health Index (PHI) measures, how PSA, free PSA, and p2PSA create the score, what high PHI may mean, and how it guides biopsy decisions.

Prostate Health Index (PHI) Test: PSA, Free PSA, p2PSA, and Prostate...

Learn how to interpret a PSA blood test, why there is no single normal cutoff, what benign conditions can raise PSA, how results relate to prostate cancer risk, and what follow-up may involve.

Prostate-Specific Antigen (PSA) Test: Normal Range, High Levels, Prostate Cancer Risk,...

Understand why PTHrP is tested in high calcium, what elevated PTHrP can mean, how humoral hypercalcemia of malignancy is identified, and why kidney function and assay type matter.

PTH-Related Peptide (PTHrP) Test: Cancer-Related High Calcium, Humoral Hypercalcemia, and Meaning

Learn what the ROMA ovarian cancer risk test measures, how CA-125, HE4, and menopause status affect the score, what high risk means, and why ROMA is not a screening test.

ROMA Test: Ovarian Cancer Risk Score, CA-125, HE4, and Menopause Status

Learn what a serotonin blood test can show in carcinoid syndrome and neuroendocrine tumors, what high levels mean, why 5-HIAA is often preferred, and how results are monitored.

Serotonin Blood Test: Carcinoid Syndrome, Neuroendocrine Tumors, High Levels, and Monitoring

Learn what a somatostatin blood test measures, what high levels can mean in somatostatinoma, how fasting and specimen handling affect results, and how neuroendocrine tumors are confirmed.

Somatostatin Blood Test: Somatostatinoma, Neuroendocrine Tumor, High Levels, and Meaning

Learn what an SCC antigen blood test measures, which squamous cancers can raise it, common benign causes of high levels, and how serial SCC antigen may be used during cervical cancer follow-up.

Squamous Cell Carcinoma Antigen (SCC Antigen) Blood Test: High Levels, Squamous...

Learn how thyroglobulin is used after differentiated thyroid cancer treatment, what rising Tg can mean, why Tg antibodies may hide recurrence, and how TSH and surgery type change interpretation.

Thyroglobulin Tumor Marker Test: Thyroid Cancer Follow-Up, Recurrence, and Thyroglobulin Antibodies

Understand total PSA testing, why normal ranges are not absolute, common causes of high PSA, how screening decisions are made, and how PSA is interpreted after prostate cancer treatment.

Total PSA Test: Normal Range, High Levels, Prostate Screening, and Follow-Up

Learn what a VIP blood test measures, how high VIP supports VIPoma in severe watery diarrhea, why potassium loss can be dangerous, and how testing, imaging, treatment, and monitoring fit together.

Vasoactive Intestinal Peptide (VIP) Test: VIPoma, Neuroendocrine Tumor, Watery Diarrhea, and...

Learn how ANCA by IFA identifies c-ANCA, p-ANCA, and atypical patterns, what PR3 and MPO confirmation means, and when results need urgent follow-up.

ANCA by IFA Test: c-ANCA, p-ANCA, Atypical ANCA, and Pattern Meaning

Understand how an ANCA reflex panel combines IFA patterns with MPO and PR3 antibodies, how result combinations relate to vasculitis, and what follow-up tests matter.

ANCA Reflex Panel: IFA Pattern, MPO Antibodies, PR3 Antibodies, and Diagnosis

Learn what positive, negative, c-ANCA, p-ANCA, PR3, and MPO results mean, how they change vasculitis risk, and which symptoms require urgent follow-up.

ANCA Test: Positive, Negative, Pattern, Vasculitis Risk, and Meaning

Learn what a high, normal, or low ACE test means, why ACE cannot diagnose sarcoidosis alone, and how medications, imaging, biopsy, and organ testing guide follow-up.

Angiotensin-Converting Enzyme (ACE) Test: Sarcoidosis, Granulomatous Disease, and Meaning

Understand what positive, negative, and borderline anti-GBM test results mean, how Goodpasture syndrome affects the kidneys and lungs, and why biopsy, ANCA testing, and urgent treatment matter.

Anti-Glomerular Basement Membrane (Anti-GBM) Test: Goodpasture Syndrome and Kidney-Lung Disease

Learn how HLA-B51, CRP, ESR, blood counts, and organ-specific tests are used in Behçet disease, why no blood panel confirms the diagnosis, and which symptoms need urgent care.

Behcet Disease Blood Test Panel: HLA-B51, CRP, ESR, and Inflammation Markers

Learn what a positive or negative c-ANCA test means, how PR3 antibodies support granulomatosis with polyangiitis, why results can mismatch, and when biopsy or urgent care is needed.

c-ANCA Test: Granulomatosis With Polyangiitis, PR3 Antibodies, and Meaning

Learn what a low, normal, or high CH50 test means in vasculitis, how CH50 differs from C3, C4, and AH50, and why immune consumption, deficiency, treatment, and sample handling matter.

CH50 Test for Vasculitis: Complement Activity, Low Levels, and Immune Meaning

Understand complement C3 and C4 results in vasculitis, including low C4, low C3 and C4, immune-complex disease, normal levels, and next tests.

Complement C3 and C4 Test for Vasculitis: Low Levels, Immune Complex...

Learn what a cryofibrinogen test detects, why warm plasma handling matters, and how positive results relate to cold-triggered clotting and vasculitis.

Cryofibrinogen Test: Blood Vessel Inflammation, Clotting, and Cold-Related Symptoms

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