A GP will follow-up on any medical conditions you have, as well as any medical conditions that are in your family.
For example, because diabetes runs in my family, I was told that I could come in and get tested for diabetes whenever I wanted.
Also, because I have asthma, I get an annual asthma check-up. At my last one, I was very surprised that they weighed me. I guess it is because obesity worsens asthma, so it is procedure to weigh everyone with asthma.
If you are on birth control pills, you will get your blood pressure checked when you renew your pills, and when you get them prescribed for the first time.
Something that happened to me recentlly, I had to have a blood test and the doctor ordered my cholesterol checked at the same time, even though the first blood test had nothing to do with my cholesterol level. I guess it is because I have a history of high blood pressure, high cholesterol and heart disease in my family.