Should individuals acquire baseline medical evaluations? If so, which ones?

Someone in another thread made a suggestion that people should get hearing screening done regularly to establish a baseline for early detection of hearing deterioration.

My wife had a complete hysterectomy in her early forties. As she and her various doctors attempted to re-establish some sense of hormonal balance, it became obvious that the ‘normal’ range of various hormone levels is so large as to be a worthless guideline for an individual. If she had had baseline tests every 5–10 years to establish what were ‘normal’ levels for her, we would have saved years of experimenting and frustration.

From your own experiences, what baseline testing would you recommend?