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Testing Knowledge Center

Laboratory antigen-antibody tests

How tests work, when they may detect infection, and how results are confirmed.

Publisher
The Bach Foundation
Audience
Public · Professional · Research
Last reviewed
18 August 2026
Status
Source-linked
Jurisdiction
Global context; local guidance may vary

Essential answer

Laboratory antigen-antibody tests is part of the Center’s testing knowledge center record.

HIV tests detect antibodies, antigen or viral genetic material. Interpretation depends on the test, timing, specimen, algorithm and reason for testing.

Complete public explanation

How tests work, when they may detect infection, and how results are confirmed.

Use the information with its source date, population and jurisdiction. A general explanation cannot determine an individual’s diagnosis, eligibility, regimen or legal obligations.

Key considerations

  • A reactive screening result normally requires the applicable confirmatory algorithm.
  • Window periods differ by technology and individual context.
  • A laboratory nucleic-acid test, antigen-antibody test, rapid test and self-test are not interchangeable.
  • Testing should connect people to prevention, confirmation and care without coercion.

Research and evidence questions

01Which algorithms shorten time to accurate diagnosis?
02How do self-testing and community testing affect linkage to services?
03Which approaches work for infants, pregnancy and acute infection?
04How can programmes protect consent and confidentiality?

Professional and academic evidence

Professional interpretation of laboratory antigen-antibody tests adds study design, population, comparator, outcomes, statistical methods, limitations, conflicts, guideline adoption, geographic applicability, replication and integrity status.

Evidence record fields for Laboratory antigen-antibody tests
FieldWhat the Center displays
Meaning and scopeDefinition, mechanism, intended use and what should not be inferred.
Population and jurisdictionAge, sex and gender, geography, HIV subtype, clinical context and issuing authority.
OutcomeClinical, virologic, diagnostic, public-health or implementation outcome and follow-up.
ProvenanceOriginal source, identifier, version, funding, conflicts, access date and review.
IntegrityProtocol changes, corrections, expressions of concern, retractions and later evidence.

Principal sources and evidence gateways

Links checked 18 August 2026
01
WHO guidelines on lenacapavir for HIV prevention and testing strategiesWorld Health Organization · Guideline · Access checked 18 Aug 2026
02
Clinical guidelines for HIV prevention and treatmentNIH Clinicalinfo · Guideline · Access checked 18 Aug 2026
03
ClinicalTrials.gov HIV study registryU.S. National Library of Medicine · Registry · Access checked 18 Aug 2026
Additional permanent evidence gateways