In daily practice, the doctor must remember, among other things, for every suspected disease, the necessary laboratory and paraclinical tests that will contribute to his diagnostic effort, which are also constantly increasing or modifying.

This handbook (2nd edition) includes in order of usefulness the tests needed and their deviation from normal values. It complements a trilogy by the same author, along with Diagnosis (The Road to Diagnosis, 2011) and Therapeutics of Internal Diseases (10th edition, 2017).

Thus, the doctor is facilitated, having three reference aids available, in the modern, daily practice of Medicine.