Basic Life Support (BLS) is a level of medical care provided to patients experiencing life-threatening emergencies, such as cardiac arrest, respiratory distress, or airway obstruction. It is a crucial intervention aimed at maintaining circulation and breathing until advanced medical help arrives. BLS Full Form: Basic Life Support The full form of BLS is basic life support, which is a series of life-saving steps performed to keep the essential functions of a person in cardiac arrest or respiratory distress until higher levels of care can be administered. Welcome to India's, Nepal & Sri Lanka Spain Visa page. Get all the information, instructions, and services you need for a hassle-free Spain visa application process. Basic Life Support, or BLS, generally refers to the type of care that first-responders, healthcare providers and public safety professionals provide to anyone who is experiencing cardiac arrest, respiratory distress or an obstructed airway.