This gives the people at risk of health problems the opportunity to get earlier treatment and make informed decisions about their health.
However, screening tests are not perfect and they can not tell you for certain if you do have a health problem. A screening test will only tell you if you are at high or low risk of the health problem.
It is also possible that you could be told you are at high risk of having a health problem when you do not have one, or that you are low risk when you do have a health problem.
It is important you understand the purpose and possible results of a screening test before you decide whether to have it. It is your decision whether or not to have any of the tests offered to you.