Infectious Disease Sexual Health A

HIV Risk Assessment (MSM/Heterosexual)

Estimates estimated HIV transmission risk per exposure type to counsel patients and guide PrEP/PEP decisions.

Result

This page added category codes, not a score. Estimated risk of HIV transmission per exposure when the source is HIV-positive and NOT on suppressive treatment (BASHH/BHIVA 2021): receptive anal sex 1 in 90; insertive anal sex 1 in 666; receptive vaginal sex 1 in 1,000; insertive vaginal sex 1 in 1,219; needlestick injury 1 in 333; sharing injecting equipment 1 in 149; mucocutaneous exposure 1 in 1,000; oral sex and human bites under 1 in 10,000. PEP is not indicated after any exposure to a source who has been on treatment for at least 6 months with an undetectable viral load. Otherwise start PEP as soon as possible — preferably within 24 hours and not beyond 72 hours — as the guideline indicates, and move people with ongoing risk from PEP to PrEP.

References

Cresswell F, Asanati K, Bhagani S, et al. UK guideline for the use of HIV post-exposure prophylaxis 2021. HIV Med. 2022;23(5):494–545.

Curated clinical cross-links plus same-class fallbacks.

Calculators

Drugs

Pathways

Decision support only — verify against a current formulary, NICE, or your local guideline before clinical use.

References

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