The basic principle of the Athlete Biological Passport (ABP) is to monitor the Athlete's biological parameters over time, with the aim of identifying the use of prohibited substances or methods, in accordance with the WADA List in force, and reinforce the global anti-doping strategies.

The ABP comprises a haematological module and a steroid module. The haematology module monitors haematological values to exclude possible blood doping. The steroid module monitors steroid concentrations in the urine to identify possible steroid doping. The Athlete's Biological Passport is not an instrument for assessing the status of the Athlete's health, but it can highlight a possible pathology. NADO Italia informs the Athlete if the passport suggests a clinical-diagnostic investigation to exclude a pathological condition.