What Is IVD?
Direct answer: IVD (in vitro diagnostics) is the analysis of samples taken from the human body — blood, serum, plasma, urine, saliva, swab or stool — performed outside the body ("in vitro" means "in glass") to detect diseases, conditions, infections or physiological states. It encompasses rapid tests, laboratory immunoassays, molecular diagnostics and clinical chemistry.
Terminology
- IVD — the broad category of out-of-body testing (reagents + instruments).
- In vivo diagnostics — imaging and tests performed inside the body (a contrast, not a synonym).
- POCT — a subset of IVD performed near the patient rather than in a central lab.
Categories of IVD
| Category | What it is | Example |
|---|---|---|
| Rapid tests / POCT | Lateral-flow and fluorescence tests, results in minutes | Dengue NS1, pregnancy (hCG) |
| Laboratory immunoassays | ELISA, chemiluminescence — batch, quantitative | Hormone panels |
| Molecular diagnostics | PCR and nucleic-acid amplification | Viral RNA detection |
| Clinical chemistry & urinalysis | Reagent strips and analyzers | Urine dipstick |
How IVD fits clinical practice
IVD underpins most clinical decisions — screening, diagnosis, monitoring and treatment guidance — without sampling tissue from inside the body. A test's value depends on sensitivity and specificity and the diagnostic window.
Regulatory context
IVD products are regulated medical devices. Market access requires quality systems (e.g., ISO 13485) and product registration (CE marking, FDA, NMPA or local registration), which vary by product and market.
IVD in simple terms
In vivo testing looks inside the body; in vitro testing takes a sample out and analyzes it in a tube, strip or instrument — which is why a finger-prick or swab can answer a clinical question in minutes.
Frequently Asked Questions
What is the difference between IVD and POCT? IVD is the broad category of out-of-body testing; POCT is the subset performed near the patient.
Are rapid tests IVD? Yes — lateral-flow rapid tests are a category of IVD.
Why does IVD matter? It enables screening, diagnosis and monitoring without invasive tissue sampling.
Related knowledge
References
- WHO diagnostic testing guidance (point-of-care and rapid diagnostics).
- Posthuma-Trumpie GA, Korf J, van Amerongen A. Lateral flow (immuno)assay: its strengths, weaknesses, opportunities and threats. Anal Bioanal Chem. 2009;393(2):569-582.
By Progene Bio Regulatory Affairs Team · Medical Device QA · Medical disclaimer · Last reviewed: 2026-09-12