Medical screening provides the insurer with all the relevant facts to make a decision on whether they can offer travel insurance.
It is used to calculate a risk score, which is determined from the questions you answer during medical screening. There will be a score for each of your medical conditions. The total score may also be affected by where you are travelling to. This is then used by the insurer to determine whether they will cover you and on what terms.
All of this may sound daunting. However, you will just need to answer a series of multiple-choice questions that takes a few minutes. Some of them might seem personal, but your answers are completely confidential. It is very important that you answer the questions as accurately as you can to ensure that you are covered. If you do not answer the questions, correctly, it may affect any claim.