TB Test for UK Visa in Nairobi: IOM Process, Cost, and the Sputum Culture Delay

Kenya is a TB-prevalent country, which means every Kenyan applying for a UK visa that lasts more than 6 months must complete a tuberculosis screening test at an approved IOM facility before submitting the application. The standard test takes a few days. For approximately 1 in 10 Kenyan applicants, it takes 8 to 10 weeks.

The difference between those two timelines depends on what the chest X-ray shows — and whether you planned for the longer scenario.

Why Kenya Requires the TB Test

The UK Home Office maintains a list of countries with high TB prevalence where mandatory pre-departure screening is required. Kenya is on that list. The International Organization for Migration (IOM) operates the approved TB testing facilities for Kenya-based applicants, with the primary facility in Nairobi.

You cannot substitute this with a private clinic chest X-ray or a test from a non-IOM facility. Only certificates issued by IOM-approved UKVI medical assessment centres are accepted by UK Visas and Immigration.

The IOM Nairobi Process

The IOM Migration Health Assessment Centre in Nairobi handles TB screening for UK-bound applicants. The standard process is:

1. Book an appointment through the IOM Kenya online portal
2. Attend for a chest X-ray (TB screening)
3. If the X-ray is clear, receive a certificate within a few days

The cost is approximately KES 8,000. This covers the radiograph, assessment by the IOM medical officer, and the certificate itself.

The IOM facility handles large volumes of applicants during NHS recruitment peaks — typically January and August. Book your appointment as early as possible rather than waiting until your CoS is assigned.

The Sputum Culture Delay: The Risk You Must Plan For

Here is the scenario that derails timelines: approximately 10% of Kenyan applicants have a chest X-ray that shows non-specific findings. This does not mean you have active TB — the findings may be old scar tissue, a minor respiratory infection, or an unrelated abnormality. But when the X-ray is not definitively clear, the IOM medical officer must order a sputum culture test before issuing a certificate.

A sputum culture takes 8 to 10 weeks to yield a result. During this time, your visa application is on hold — you cannot submit it without the IOM certificate. If you have already received your Certificate of Sponsorship, the clock on its 3-month validity is running.

This is a significant risk for Kenyan applicants because:

• Kenya has a higher rate of incidental chest X-ray findings than many other countries, due to TB prevalence
• 8 to 10 weeks is a substantial portion of the 3-month CoS validity window
• There is no way to accelerate the culture result

How to Reduce the Risk of a Surprise Delay

If you have any history of chest infections, treated TB, bronchitis, or pneumonia — even years ago — consider getting a private chest X-ray before your IOM appointment. This gives you advance notice of whether your X-ray is likely to show non-specific findings. It does not replace the IOM test, but it allows you to have that conversation with your employer about CoS timing before the delay happens rather than during it.

If your private X-ray shows concerns, discuss with your employer whether the CoS can be assigned after your IOM results are in rather than before. Some NHS Trusts are willing to do this, particularly those with established Kenya recruitment relationships. Others will assign the CoS immediately after the offer letter is signed regardless.

Timing the TB Test in Your Application Schedule

The correct place for the TB test in your planning timeline is immediately after your offer letter is signed — not after the CoS is assigned. Typical safe sequence:

1. Offer letter signed → apply for DCI Good Conduct and book IOM TB test simultaneously
2. CoS assigned → you already have your DCI clearance and IOM certificate, or they are days from completion
3. Submit online application within the 3-month CoS window with all documents ready

Applicants who book the TB test after the CoS is assigned and then encounter a sputum culture delay lose weeks of their window before the application is even submitted.

The Kenya to UK Skilled Worker Guide provides a pre-CoS preparation timeline that integrates the IOM TB test, DCI certificate, KNEC verification, and bank statement 28-day window into a sequenced schedule designed to prevent CoS expiry.

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