HIV-1/2 Screening

A fourth-generation HIV screening test detecting both HIV-1/2 antibodies and p24 antigen simultaneously. This combination test shortens the diagnostic window to approximately 2 to 6 weeks post-exposure compared to 12 weeks for antibody-only assays. Reactive results are automatically confirmed with a supplementary Western blot or immunoblot assay at no additional charge.

The fourth-generation HIV combination assay represents a significant advance over earlier antibody-only tests. By detecting the p24 antigen — a viral capsid protein that appears in blood during the acute phase of infection before antibodies develop — this test can identify HIV infection as early as two weeks after exposure. The parallel antibody detection covers established infection where p24 antigen may have declined below detectable levels. SYNLAB München Zentrum uses automated chemiluminescent immunoassay platforms for screening, following the diagnostic algorithm mandated by the Robert Koch Institut and German HIV testing guidelines. All reactive screening results are reflexed to confirmatory testing (Western blot or line immunoassay) automatically and at no additional cost to the patient, eliminating the need for a separate visit or additional payment. Confidentiality is handled according to German medical data protection law (Ärztliche Schweigepflicht). Results are communicated only to the patient directly or to the referring physician if one was named. No fasting is required for the blood draw. Results for non-reactive screens are typically available within one to two working days. Reactive results may take an additional two to three days for confirmatory testing.