Definitions of bill of health
(colloquial) if a person or an institution receives a clean bill of health then someone, especially an official, has said that the person is not ill or that an institution can function effectively
He was discharged from a Tokyo hospital Thursday with a clean bill of health.
a certificate given to the master of a ship relating to an outbreak of an infectious disease on the ship or in the port from which the ship has sailed
They have worked very hard at maintaining a clean bill of health following the recent ebola outbreaks.