Understanding Results
Test Indicators & Targets
Plain-language explanations of laboratory indicators: what they measure, when they are tested, and how to read results responsibly. Reference ranges vary by laboratory and method — we never provide a universal normal value or a diagnosis.

BI25-OH Vitamin DThe main circulating vitamin D metabolite — the standard measure of vitamin D status.BICardiac Troponin (cTnI/cTnT)Proteins released into blood when heart muscle is injured; the central laboratory marker in suspected heart attack.BICMV DNAQuantitative marker of cytomegalovirus replication used in transplant and immunocompromised care.BICT/NG DNAMolecular detection of Chlamydia trachomatis and Neisseria gonorrhoeae nucleic acid.BID-DimerA fibrin breakdown fragment — most useful for ruling out venous thromboembolism when clinical probability is low.BIFerritinThe body’s iron-storage protein measurable in serum — the most informative single test of iron stores.BIHbA1cGlycated hemoglobin — an integrated measure of average blood glucose over roughly the preceding two to three months.BIHBV DNAQuantitative marker of hepatitis B virus replication used in treatment decisions and monitoring.BIHCV RNAQualitative or quantitative marker of active hepatitis C infection.BIHigh-risk HPVGroup of HPV genotypes associated with higher risk of cervical disease.BIHIV-1 Viral LoadQuantitative measure of HIV-1 RNA in plasma used to stage and monitor therapy.BIhs-CRPHigh-sensitivity C-reactive protein — an inflammation marker also used, in context, in cardiovascular risk assessment.BIInfluenza A/B RNAMolecular detection and typing of influenza A and B viruses.BILDL CholesterolLow-density lipoprotein cholesterol — the primary lipid target in cardiovascular prevention.BIMTB DNADirect molecular detection of Mycobacterium tuberculosis complex in respiratory specimens.BINT-proBNPA peptide released when the heart is under pressure or strain; used in the workup of heart failure.BIProcalcitoninA biomarker rising markedly in systemic bacterial infection — decision support for antibiotic pathways, not a diagnosis by itself.BIPSAProstate-specific antigen — a prostate tissue protein whose blood level rises in prostate cancer and in common benign conditions.BISARS-CoV-2 RNAMolecular detection of SARS-CoV-2 in respiratory specimens.BITSHThyroid-stimulating hormone — the pituitary signal that regulates the thyroid and the usual first test of thyroid function.
