Medical certificate or clearance? When you need one for COVID-19 vaccination 208 '); Two doctors reminded the public of the medical certificate and clearance requirements for persons with health conditions who wish to receive a vaccine against COVID-19. A medical certificate serves as a written proof of a patient’s health condition while a medical clearance is defined as an “official authorization for something to proceed or take place.” Carlo Trinidad, also known as “Kidney Doctor” on social media, shared an infographic about the health conditions that require a medical clearance. He cited a press release from the Department of Health as his source.