At-Home HIV Testing Before PEP: Should You Do It?

Many people hesitate to visit a medical facility immediately after an HIV exposure risk – due to psychological barriers, fear of stigma, or distance from a health center. In such situations, at-home HIV self-testing (HIV self-test) is an incredibly useful solution. The WHO 2024 explicitly recommends that: HIV self-testing can be used to decide on PEP initiation – if the result is negative, the exposed individual can start taking the medication immediately [1]. Self-testing is particularly suitable in the following situations:

• You cannot reach a clinic immediately after exposure;
• You are in a remote area, with limited access to on-site rapid testing;
• You need a quick check before seeking PEP medication;
• You feel more comfortable testing privately at home rather than going to a clinic.

How to use an HIV self-test before starting PEP:

• Prepare a quality test kit: Choose a self-test recommended by the Ministry of Health or WHO (e.g., using an oral fluid swab or a finger-prick blood drop).
• Read the instructions carefully: Each test kit has specific instructions – follow each step correctly to avoid errors.

Perform the test and read the result:

• If the result is negative, you should start PEP immediately if indicated. If the result is positive, you should not take PEP but need to visit a healthcare facility for confirmation with an in-depth test and start ARV treatment if necessary.
• Contact a doctor or the nearest healthcare center: Even when using a self-test at home, you should soon visit for a direct consultation to receive the official PEP regimen and monitoring. Self-testing does not completely replace medical consultation but is a quick enabler to help you act promptly.

Important Note: HIV self-tests have high accuracy but are not absolute. Therefore, if you suspect HIV exposure and are unsure about the self-test result, you should still start PEP early and get retested as soon as possible. WHO emphasizes: “PEP can be started based on a negative HIV self-test result, provided there is no clear contraindication.” HIV self-test is a useful, flexible tool that supports users in accessing PEP more quickly and conveniently. If you have just experienced a situation with HIV risk and are hesitant to visit a clinic, consider using a self-test at home. A negative result allows you to start PEP immediately – don’t miss the golden window. However, remember that self-testing is only the initial step; you still need to see a doctor as soon as possible for comprehensive monitoring and support throughout the medication course [1].

Should the use of PEP be delayed if an HIV screening test is not available or the results are not yet ready?

The initiation of PEP (Post-Exposure Prophylaxis) should not be delayed even if you have not performed an HIV test or the test results are not yet available, including self-tests. According to CDC and WHO guidelines, PEP needs to be started as soon as possible within 72 hours of exposure, ideally within the first 24 hours, to achieve optimal effectiveness in preventing HIV infection. If immediate testing is not possible, you should still start PEP and undergo HIV testing at a healthcare facility as soon as you can. After completing the 28-day course of medication, you need to be retested at time points such as 4–6 weeks and 3 months after exposure to definitively confirm HIV-negative status. Therefore, waiting for test results is not a condition to delay PEP initiation [1].

This article is written by Dr Đỗ Hữu Đạt. The doctor has many years of in-depth experience in reproductive and sexual health care.

Reference

[1]. Guidelines for HIV post-exposure prophylaxis [Internet]. [cited 2025 Jul 17]. Available from: https://www.who.int/publications/i/item/9789240095137.