After unprotected intercourse three days ago, what should I do to assess my HIV status?

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Last updated: September 20, 2026 • View editorial policy

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Immediate Action Required: Start HIV Post-Exposure Prophylaxis (nPEP) NOW

You need to seek medical care immediately to start HIV post-exposure prophylaxis (nPEP) within 72 hours of the unprotected intercourse—you are currently at day 3, which is the last day this preventive treatment can be initiated 1.

What to Do Right Now

Urgent Steps (Within Hours)

  • Go to an emergency department, urgent care, sexual health clinic, or HIV clinic TODAY
  • Request HIV nPEP (nonoccupational post-exposure prophylaxis)
  • The first dose must be given as soon as possible—every hour counts 1

What Will Happen at Your Visit

Initial HIV Testing:

  • You will receive a rapid HIV test AND a laboratory-based antigen/antibody (Ag/Ab) test 1
  • These tests determine your current HIV status before starting nPEP
  • A negative result allows nPEP to begin immediately

The nPEP Regimen:

  • 28-day course of antiretroviral medications 1
  • Preferred regimens are:
    • Bictegravir/emtricitabine/tenofovir alafenamide (single pill, once daily), OR
    • Dolutegravir plus tenofovir (alafenamide or disoproxil fumarate) plus emtricitabine or lamivudine 1

Understanding Your Situation

Why the 72-Hour Window Matters

nPEP is only recommended when started within 72 hours of exposure 1. After this window, there is insufficient evidence that it prevents HIV infection. Since you are at day 3, you are at the absolute deadline.

When nPEP is Recommended

Your situation requires case-by-case determination because:

  • The exposure occurred within 72 hours ✓
  • Unprotected intercourse presents substantial HIV transmission risk ✓
  • The source person's HIV status is unknown 1

nPEP is definitively recommended if the source person has HIV with unknown or detectable viral load 1.

nPEP may not be needed if the source person is known to be HIV-negative or has sustained viral suppression on treatment 1.

Follow-Up Testing Schedule

You cannot know your true HIV status immediately—testing must occur over 12 weeks:

Testing Timeline

  1. Baseline (today): Rapid + laboratory Ag/Ab test 1

  2. 4-6 weeks after starting nPEP: Laboratory Ag/Ab test + HIV RNA (NAT) test 1

    • This can be deferred if you started nPEP within 24 hours and took all doses perfectly 1

  3. 12 weeks after exposure (final): Laboratory Ag/Ab test + HIV RNA (NAT) test 1

    • This is the definitive test to rule out HIV infection
    • Both tests are required because antiretroviral medications can delay detection 1

Critical Caveat About Testing

You cannot rely on standard HIV antibody tests alone during or shortly after nPEP because the medications can suppress the virus and delay antibody development, potentially causing false-negative results 1. This is why both Ag/Ab and RNA tests are required at follow-up.

Additional Considerations

Other Sexually Transmitted Infections

Unprotected intercourse also puts you at risk for:

  • Chlamydia
  • Gonorrhea
  • Syphilis
  • Hepatitis B

Request STI testing and discuss whether presumptive treatment or vaccination (hepatitis B, HPV) is appropriate 1.

If You Cannot Access Care Immediately

  • Call the National Clinician Consultation Center PEPline at 888-448-4911 for guidance 1
  • They provide 24/7 expert consultation on HIV post-exposure prophylaxis

Common Pitfall to Avoid

Do not wait for test results or try to assess your risk further—the 72-hour window is absolute. Even if you think the risk was low, medical evaluation is needed to make this determination properly. The consequences of missing this window could be life-altering, while nPEP medications are safe and well-tolerated 1.

After Completing nPEP

If you have ongoing HIV exposure risk, discuss transitioning to pre-exposure prophylaxis (PrEP) for continuous protection 1.

References

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Professional Medical Disclaimer

This information is intended for healthcare professionals. Any medical decision-making should rely on clinical judgment and independently verified information. The content provided herein does not replace professional discretion and should be considered supplementary to established clinical guidelines. Healthcare providers should verify all information against primary literature and current practice standards before application in patient care. Dr.Oracle assumes no liability for clinical decisions based on this content.