BCLS stands for Basic Cardiac Life Support, a set of emergency skills used to keep someone alive during cardiac arrest or respiratory failure until advanced medical help arrives. The term is used interchangeably with BLS (Basic Life Support) in most countries, though some regions like Singapore specifically use “BCLS” in their national guidelines. Whether you’ve seen the abbreviation on a job posting, a course listing, or a hospital requirement, it refers to the same core training: CPR, rescue breathing, AED use, and choking relief for adults, children, and infants.
What BCLS Covers
A BCLS course teaches you how to respond in the critical minutes before paramedics or hospital teams take over. The curriculum is built around hands-on practice and includes:
- Single-rescuer CPR for adults, children, and infants
- Two-rescuer CPR and high-performance team dynamics
- AED operation (automated external defibrillator)
- Bag-mask ventilation for delivering breaths
- Choking relief for all age groups
- Rescue breathing for someone with a pulse but not breathing adequately
The American Heart Association’s BLS Provider Course, which is the most widely recognized version in the United States, tests you on adult CPR with an AED and infant CPR before issuing certification. The completion card is valid for two years, after which you need to recertify.
CPR Technique by Age Group
The compression technique changes depending on the person’s size. For adults, you push down on the center of the chest at least 5 centimeters (about 2 inches) deep, at a rate of 100 to 120 compressions per minute. That pace is roughly the tempo of the song “Stayin’ Alive.” For children and infants, the target depth is at least one-third the depth of the chest, which requires less force but the same compression rate.
With a single rescuer, the standard ratio is 30 chest compressions followed by 2 breaths for all age groups. With two rescuers working on a child or infant, the ratio shifts to 15 compressions and 2 breaths, allowing more frequent ventilation for smaller patients whose oxygen reserves deplete faster. Full chest recoil between compressions matters as much as depth, because the heart needs to refill with blood before the next push.
How AEDs Are Used
AEDs analyze heart rhythm and deliver an electrical shock if needed. BCLS training covers where to place the pads and how to operate the device safely. For adults, one pad goes just below the right collarbone and the other goes on the left side below the armpit. An alternative is front-and-back placement, with one pad between the shoulder blades and the other on the front of the chest.
For children under 8 years old, including infants, pediatric pads with reduced energy output are preferred. If pediatric pads aren’t available, standard adult pads can be used. The key concern with smaller patients is making sure the two pads don’t touch each other on the chest. If they’re too large to fit side by side, front-and-back placement solves the problem. The AED itself will walk you through each step with voice prompts once powered on.
Choking Relief
BCLS also covers foreign-body airway obstruction, the clinical term for choking. You need to act when someone shows signs of a severe blockage: they can’t speak or cough effectively, their skin color changes, or they become confused or unresponsive.
For a conscious adult or child, the current protocol is to alternate 5 back blows (firm slaps between the shoulder blades) with 5 abdominal thrusts, repeating the cycle until the object comes out or the person loses consciousness. For someone in late pregnancy, or when you can’t wrap your arms around the person’s abdomen, chest thrusts replace abdominal thrusts. If the person becomes unresponsive, you transition immediately to CPR, starting with chest compressions and checking for a visible object in the mouth before giving breaths.
BCLS vs. ACLS
BCLS is the foundation. It uses no medications, no IV lines, and no advanced equipment beyond an AED and a bag-mask device. Advanced Cardiac Life Support (ACLS) builds on top of it, adding skills like interpreting heart rhythms, placing advanced airways, starting IV access, and administering emergency medications. ACLS also covers stroke recognition, acute coronary syndromes, and post-cardiac arrest management.
BCLS is designed for anyone who might need to respond to a cardiac emergency, from nurses and paramedics to dental hygienists and athletic trainers. ACLS is aimed at physicians, critical care nurses, paramedics, and other clinicians who manage patients through the full resuscitation process. You typically need current BCLS certification before enrolling in an ACLS course.
Who Needs BCLS Certification
Most healthcare employers require BCLS certification as a condition of hiring. This includes hospitals, outpatient clinics, dental offices, physical therapy practices, and long-term care facilities. Many nursing, medical, and allied health programs also require it before students begin clinical rotations.
You can complete the training through a fully in-person classroom course or a blended format that pairs online learning with a hands-on skills session. The in-person portion is essential because certification requires you to demonstrate compressions, ventilations, and AED use on a manikin under an instructor’s observation. The entire course typically takes a few hours to complete. After two years, you’ll need to recertify, which usually involves a shorter refresher course and another skills test.
Regional Differences
The core technique is consistent worldwide because international resuscitation councils coordinate their guidelines through a shared review of the same body of evidence. Minor differences exist. Singapore’s Resuscitation and First Aid Council, for example, defines “adult” as anyone over 12 years old and recommends against placing a person who regains a pulse in the recovery position, citing concerns that it could mask a second cardiac arrest. Singapore also shifted to teaching bag-mask ventilation instead of mouth-to-mask breathing for healthcare providers during the COVID-19 pandemic, a change many other countries adopted as well.
Regardless of where you train, the compression depth, rate, and ratios are the same. If your employer or school asks for “BCLS” certification, a current BLS Provider card from the American Heart Association, Red Cross, or your country’s equivalent resuscitation council will satisfy the requirement.