BLS certification covers CPR for adults, children, and infants, AED use, airway obstruction management, rescue breathing, team-based resuscitation skills, and opioid overdose response. It’s more comprehensive than a standard CPR class because it’s designed for healthcare professionals and first responders, not just bystanders. The certification is valid for two years after you complete the course.
Who BLS Certification Is For
BLS stands for Basic Life Support, and it’s geared toward people who may need to respond to cardiac or respiratory emergencies as part of their job. That includes doctors, nurses, nurse practitioners, EMTs, paramedics, dentists, dental hygienists, physical therapists, mental health professionals, home health aides, nursing home staff, firefighters, and police officers. Many employers and credentialing bodies in healthcare require a current BLS card.
A standard CPR/AED class teaches bystanders the basics of keeping someone alive until paramedics arrive. BLS builds on that foundation with additional techniques, deeper skill practice, and training in team communication. If your workplace or school requires “BLS certification” specifically, a basic CPR class won’t satisfy that requirement.
CPR for Adults, Children, and Infants
The core of BLS is high-quality chest compressions and ventilations across all age groups. For adults, you learn to compress the chest at least two inches deep at a rate of 100 to 120 compressions per minute, allowing the chest to fully recoil between each compression. Minimizing pauses in compressions is emphasized repeatedly because even brief interruptions reduce blood flow to the brain and heart.
The compression-to-ventilation ratio changes depending on the situation. A single rescuer uses a 30:2 ratio for all age groups: 30 compressions followed by 2 breaths. When two rescuers are working together on an infant or child, the ratio shifts to 15:2, meaning more frequent breaths relative to compressions. This difference reflects the fact that pediatric cardiac arrests are more often caused by breathing problems than by heart rhythm issues, so ventilation plays a larger role.
You’ll practice compressions on adult, child, and infant manikins. Infant CPR uses two fingers or a two-thumb technique rather than full hand placement, and compression depth is about 1.5 inches. Child compressions fall somewhere between infant and adult technique, using one or two hands depending on the child’s size.
Airway Management and Ventilation Techniques
BLS training covers multiple methods for delivering breaths to someone who isn’t breathing. You’ll learn to use a pocket mask (a small barrier device you place over the person’s face) and a bag-valve mask, which is the squeezable bag connected to a face mask that you’ve probably seen paramedics use.
Bag-valve-mask ventilation is harder than it looks. The most difficult part is maintaining a tight seal between the mask and the face. In a two-person technique, one person holds the mask with both hands while the other squeezes the bag. Each breath should be delivered smoothly over one second, using just enough air to make the chest visibly rise. For an average adult, that’s roughly 500 milliliters of air, which means you only squeeze a standard bag about halfway. Over-ventilating is a common mistake that can force air into the stomach and create complications.
AED Operation
Every BLS course includes hands-on practice with an automated external defibrillator. An AED analyzes heart rhythm and delivers an electric shock if it detects a rhythm that can be corrected by defibrillation. The steps are straightforward: turn the device on, expose the chest, place one pad on the upper right chest and the other on the lower left side below the armpit, and follow the voice prompts.
You’ll also learn the safety precautions that go along with it. Before the AED analyzes the rhythm and before it delivers a shock, you loudly say “Clear!” and confirm that nobody is touching the person. If the pads risk touching each other (on a small child, for instance), one pad goes on the center of the chest and the other on the back between the shoulder blades. The course covers pad placement for children and the use of pediatric pads or dose attenuators when available.
Choking Response Across Age Groups
BLS certification trains you to manage foreign-body airway obstruction in conscious and unconscious victims. For a conscious adult or child who is choking and can’t cough effectively, you start with back slaps (five firm blows between the shoulder blades) and then move to abdominal thrusts if the back slaps don’t work. For infants, abdominal thrusts are not used because of the risk of injuring internal organs that aren’t fully protected by the ribcage. Instead, you alternate back slaps with chest thrusts.
If a choking victim becomes unconscious, you lower them to the ground and begin CPR with chest compressions. Before each set of breaths, you open the mouth and look for the object. If you can see it, you remove it. Blind finger sweeps, where you stick a finger in without seeing anything, are no longer recommended because they can push the object deeper.
Opioid Overdose Response
Current BLS guidelines incorporate the use of naloxone, an opioid-reversing medication, into the response algorithm for suspected opioid overdoses. You’ll learn to recognize the signs of an opioid-related emergency, including slow or absent breathing and unresponsiveness, and how to administer naloxone (typically as a nasal spray) while continuing to support breathing. This was added to reflect the reality that many cardiac and respiratory arrests today involve opioids.
Team Dynamics and Communication
One thing that separates BLS from a basic CPR class is the emphasis on working as a coordinated team. In a real resuscitation, multiple providers are involved, and poor communication causes mistakes. The course teaches a structured approach: every team has a designated leader who assigns roles, makes treatment decisions, and provides feedback. Other roles include the person doing compressions, the person managing the airway, someone operating the AED, and a timer or recorder who tracks compression interruptions and communicates them to the team.
You’ll practice closed-loop communication, where the team leader gives an instruction, the team member repeats it back, completes the task, and confirms it’s done. This sounds simple, but it prevents the kind of confusion that happens when several people are working on the same patient under pressure.
What the Course and Exam Look Like
BLS courses are offered in classroom, blended (online learning plus in-person skills session), and fully in-person formats through organizations like the American Heart Association and the American Red Cross. Regardless of format, you’ll need to demonstrate skills on manikins in front of an instructor. The course typically takes a few hours to complete.
To earn your certification, you pass both a written exam and a skills evaluation. The written portion tests your knowledge of compression depths, ratios, AED procedures, and decision-making in various scenarios. The skills test requires you to perform CPR, use an AED, and manage an airway obstruction correctly on manikins. Upon passing, you receive a completion card valid for two years, after which you’ll need to take a renewal course to stay current.
BLS Certification vs. Standard CPR
A standard CPR/AED course covers the basics for laypeople: chest compressions, rescue breaths, AED use, and choking. BLS includes all of that plus bag-valve-mask ventilation, multi-rescuer techniques with different compression-to-ventilation ratios, team leadership and communication skills, opioid overdose response, and legal considerations relevant to healthcare settings. BLS also meets the credentialing and privileging requirements for clinical positions in hospitals, pre-hospital settings, and post-acute care facilities. If you’re entering or working in healthcare, BLS is the standard you need.