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How Soon After Sex Should You Get Tested for STIs in Nairobi?

Possible HIV exposure in the last 72 hours? Get care now, not a test. Otherwise, timing depends on the method — PCR or blood.

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Medically reviewed by Dr. Duncan Ajowi, Consultant Obstetrician & Gynaecologist · Last updated: 2026-07-28
Key Takeaways
  • Possible HIV exposure in the last 72 hours? PEP may help — seek care immediately, don't wait to test.
  • Timing depends on the test: PCR detects the pathogen directly (chlamydia, gonorrhoea, mycoplasma, herpes); HIV, syphilis, and hepatitis B use blood tests with an early window period.
  • Testing too early on a blood test can give a false-negative result — it doesn't rule out infection.
  • CA Medlynks packages range from KES 5,000 to KES 30,000, with results ready in 24 to 72 hours.
Seek care urgently if your possible HIV exposure was within the last 72 hours — PEP may reduce infection risk, but only within this window. Don't wait for a test result. Call +254 741 669 175 now.

The Short Answer

Which situation matches you?

Illustration of two open hands cupping a red HIV awareness ribbon

Possible HIV Exposure, Last 72 Hours

  • Don't wait to test — call now for a PEP assessment. PEP only works within 72 hours.
Line illustration of a medical clipboard with a symptom checklist and a tick

You Already Have Symptoms

  • Test now, regardless of timing. PCR detects the pathogen directly — no antibody wait needed.
Illustration of a person resting a hand against their face, looking worried despite feeling physically well

No Symptoms, Routine Concern

  • Timing depends on the test method — see the comparison below.

Why Test Timing Isn't the Same for Every STI

Timing depends on how the test works, not a single number of days.

PCR (DNA) Tests
  • Used for chlamydia, gonorrhoea, mycoplasma, ureaplasma, and genital herpes (HSV).
  • Detects the pathogen's genetic material directly — no antibody wait needed.
  • The gold-standard method — more sensitive than rapid tests, and detects infection even without symptoms.
Blood / Antibody Tests
  • Used for HIV, syphilis, and hepatitis B.
  • These have an early window period; repeat testing may be needed depending on time since exposure.
  • Testing too soon is the main reason an infected person can still test negative.

Test Method and Timing by Infection

A standard HIV test doesn't screen for other STIs — method matters as much as timing.

Detected by PCR (no antibody window)
ChlamydiaPCR / DNA test
Test once exposed or symptomatic
GonorrhoeaPCR / DNA test
Test once exposed or symptomatic
Mycoplasma & UreaplasmaPCR / DNA test
Test once exposed or symptomatic
Genital Herpes (HSV)PCR / DNA test
Most reliable when an active sore is present
Detected by blood / antibody test (early window period)
HIVBlood test
Within 72h: PEP assessment, not a routine test
SyphilisBlood test
Early window period — repeat testing may be advised
Hepatitis BBlood test
Early window period — repeat testing may be advised

Blood tests for HIV, syphilis, and Hepatitis B have an early window period; repeat testing may be needed depending on time since exposure.

Yellow triangular warning sign with an exclamation mark

The Problem With Testing Too Early

A negative result right after exposure can be reassuring for the wrong reason.

Why an Early Negative Isn't the Final Answer
  • Blood tests for HIV, syphilis, and hepatitis B have an early window period — testing too soon can miss a real infection.
  • Testing too early gives false reassurance and delays an accurate result.
  • PCR-detected infections (chlamydia, gonorrhoea, mycoplasma, herpes) don't rely on an antibody response, so this is less of an issue — but a private consultation is still the safest way to time your test.

If You've Already Tested, Should You Retest?

Depends on which test you had and how soon after exposure it was taken.

If your first test was a blood test (HIV, syphilis, or hepatitis B) taken soon after exposure and came back negative, you may need to retest — timing depends on how much time has passed. Our clinical team can advise on the right retest timing at a private consultation.

Illustration of a signpost with two directional signs, representing choosing the path that matches your situation

What Should You Do? By Situation

Pick the description closest to yours.

I Have Symptoms

  • Test now — a comprehensive STI panel is usually recommended over a single test.
See the full symptoms guide →

Exposed in the Last 72 Hours

Possible HIV exposure

  • Call now for a PEP assessment — don't wait to test first.
Call +254 741 669 175 now →

Exposed More Than 72 Hours Ago

No symptoms yet

  • PEP is no longer an option; a private consultation can advise on the right test timing for your exposure.
Book a consultation →

Routine, No Known Exposure

  • Routine screening is reasonable at any time — testing doesn't require a specific reason.
See test packages & pricing →

Not Sure Which Test You Need?

Our clinical team will help you choose the right test and timing at a private, confidential consultation — you don't need this figured out before you come in.

Visit Us

Address: Daykio Plaza, Ground Floor, Off Ngong Lane, Nairobi

Phone: +254 741 669 175

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Why Patients Choose Us
  • Confidential & discreet testing protocols
  • KENAS-accredited PCR laboratory testing
  • Private consultation room, 10-15 minute sample collection
  • Same-day appointments available
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This article is for general information only and does not replace professional medical advice, diagnosis, or treatment. Always speak to a qualified healthcare professional about your individual circumstances.

Frequently Asked Questions

Common questions about STI testing timing, PEP, and results.

Q How soon after sex should I get an STI test? +
It depends on the situation. If you had a possible HIV exposure in the last 72 hours, contact CA Medlynks immediately to discuss PEP rather than waiting to test. For other STIs, PCR tests (chlamydia, gonorrhoea, mycoplasma, herpes) detect the pathogen directly, while HIV, syphilis, and hepatitis B use blood tests with an early window period, so repeat testing may be advised.
Q What is PEP and when does it need to start? +
PEP (post-exposure prophylaxis) may reduce HIV infection risk after a possible exposure, but must start within 72 hours. Call CA Medlynks on +254 741 669 175 immediately if you think you're eligible — don't wait for a test result first.
Q Can a negative test taken right after exposure be wrong? +
Yes. Blood tests for HIV, syphilis, and hepatitis B have an early window period, so testing right after exposure can miss a real infection. Repeat testing may be advised depending on how much time has passed since the exposure.
Q Do I need to wait to test if I already have symptoms? +
No. If you already have symptoms, get tested regardless of timing. PCR detects the pathogen's genetic material directly, and a private consultation at CA Medlynks can help determine the right test for your symptoms.
Q How much does STI testing cost at CA Medlynks and how long do results take? +
CA Medlynks packages range from KES 5,000 to KES 30,000 depending on how many infections are covered. Most results are ready within 24 to 72 hours, and rapid HIV tests are available the same day.

Medically Reviewed By

This guide has been medically reviewed and is based on current international and Kenyan national STI testing guidelines.

Dr. Duncan Ajowi

Dr. Duncan Ajowi

Consultant Obstetrician & Gynaecologist
Qualifications
  • Master of Medicine (MMed), Obstetrics & Gynaecology – University of Nairobi
  • Diploma in Laparoscopic Surgery – Henrob Hospital, Uganda
Areas of Special Interest
  • Fertility Evaluation & Infection Management
  • High-Risk Pregnancy Care & Screening
  • Gynaecologic Cancer Screening & Preventive Care
Dr. Paul Yonga

Dr. Paul Yonga

Medical Director & Infectious Disease Specialist
Qualifications
  • MBChB — Bachelor of Medicine & Surgery
  • MSPH — Master of Science in Public Health
  • FRCP (Edin) — Fellow of the Royal College of Physicians of Edinburgh
Areas of Expertise
  • Infectious Diseases Management
  • Travel Medicine & Tropical Diseases