Question

I am confused about the window period – can you clarify?

7 December 2010. Related: All topics, HIV testing, HIV transmission.

Hello,

I am a bit confused regarding the window period of the DUO HIV tests. Are they conclusive on 28 days and beyond or after 3 months. You inform that the window is 3-4 weeks on the header but then at the last paragraph you inform that the window is 3 months since 5% of people have an immune response later. I am totally confused!!

Can you please clarify?

Thank you

Answer

Answer: Charlotte Walker

Thank you for your question.

I am sorry for the confusion. The problem is that everyone is different and our systems all work in slightly different ways. For the majority of the population, over 95% of people, the window period is 4 weeks. However, 5% of people need the full window period of 3 months.

For a more specific answer which includes the statment from the British Association for Sexual Health and HIV (BASHH) please follow this link.

To view this graphically please follow this link to a diagram you might find helpful