CPR/AED certification is a credential that proves you’ve been trained to perform cardiopulmonary resuscitation and use an automated external defibrillator on someone in cardiac arrest. The certification is issued after completing a course that typically takes a few hours and lasts for two years before you need to renew it. Most people get certified because their job requires it, but the training is open to anyone.
What the Course Covers
A standard CPR/AED course teaches three core skills: chest compressions, rescue breathing, and operating an AED. You’ll also learn how to help someone who is choking and how to recognize the signs that a person has stopped breathing or is in cardiac arrest. The goal is to keep blood flowing to the brain and vital organs until paramedics arrive.
Chest compressions are the centerpiece of the training. You’ll practice pushing hard and fast on the center of a person’s chest using a training mannequin. The target depth is at least 2 inches but no more than about 2.4 inches, at a rate of 100 to 120 compressions per minute. You alternate 30 compressions with 2 rescue breaths, each delivered over one second with enough air to make the chest visibly rise. That cycle repeats until emergency services take over or an AED becomes available.
AED training covers how to power on the device, place the electrode pads on the person’s chest, and let the machine analyze the heart rhythm. The AED does the complex decision-making for you, determining whether a shock is needed and telling you when to press the button. You’ll learn the safety precautions, like making sure no one is touching the person when the shock is delivered, and how to resume compressions immediately afterward.
CPR vs. BLS Certification
There are two main tiers of certification, and which one you need depends on your profession. Standard CPR/AED courses are designed for the general public: parents, teachers, childcare providers, fitness trainers, office workers, and anyone who wants to be prepared. These courses satisfy most workplace safety requirements, including those mandated by OSHA.
Basic Life Support (BLS) certification is the more comprehensive version, built for healthcare workers and first responders like nurses, paramedics, firefighters, and EMTs. BLS covers everything in a standard CPR/AED course but adds training in rapid patient assessment, responding to opioid overdoses, obstructed airways, and team-based resuscitation with an emphasis on communication and critical thinking. A BLS certification is valid for two years and meets the credentialing requirements for clinical and pre-hospital settings.
Who Offers It
The two most widely recognized certifying organizations in the United States are the American Heart Association (AHA) and the American Red Cross. Both are accepted by employers and regulatory agencies nationwide. The AHA publishes the official scientific guidelines for CPR and resuscitation that the entire field follows. Its Heartsaver courses are specifically designed for non-medical professionals who need a completion card for work or personal preparedness. The Red Cross offers a similar lineup of CPR/AED and First Aid courses at comparable price points.
Other organizations also offer CPR training, but if your employer or state licensing board requires certification, confirm they accept the provider before enrolling. AHA and Red Cross credentials are nearly universally recognized.
In-Person, Online, or Blended
CPR/AED courses come in three formats. Traditional in-person classes put you in a room with an instructor and mannequins for the entire session. Blended courses split the work: you complete video lectures and a knowledge quiz online at your own pace, then attend a shorter in-person session for hands-on practice and a skills test. Fully online courses exist as well, where you practice at home with a personal mannequin kit and submit your assessment remotely.
Research comparing these formats found that students who trained entirely remotely performed just as well on compression depth, rate, and chest recoil as those who trained with an in-person instructor. The tradeoff was time: remote learners needed more days of practice (about 12 versus 9) and more attempts to pass their final skills check. If you learn well independently and have the discipline to practice, a blended or remote option can work. But there’s one important caveat.
OSHA has stated clearly that online training alone, without any hands-on practice component, does not meet federal workplace first aid and CPR requirements. The reasoning is straightforward: CPR is a physical skill, and the only way to learn a physical skill is to actually perform it. If your certification is for a job, make sure your course includes practice on a mannequin, whether that happens in a classroom or at home with a kit.
How You’re Tested
To earn your certification, you need to pass both a written knowledge test and a hands-on skills check. The written portion is typically 20 to 25 multiple-choice questions covering when to call emergency services, how to recognize cardiac arrest, and how an AED works.
The skills test is where it matters. An instructor (or in remote formats, a recording reviewed by an evaluator) watches you perform a full CPR and AED sequence on a mannequin. You’re graded against specific benchmarks: delivering 30 compressions in 15 to 18 seconds, hitting the correct depth of at least 2 inches with full chest recoil after each compression, maintaining a rate of 100 to 120 compressions per minute, and resuming compressions within 10 seconds after delivering breaths. These numbers aren’t arbitrary. They reflect what clinical evidence shows gives a person in cardiac arrest the best chance of survival.
How Long It Lasts
Both AHA and Red Cross CPR/AED certifications are valid for two years. After that, you take a renewal course, which is shorter than the original class because it assumes you already have the foundational knowledge. Renewal updates you on any changes to resuscitation guidelines and retests your skills, extending your certification for another two years. If you let your certification lapse entirely, you’ll need to take the full course again.
Who Needs It
Many jobs require CPR/AED certification by law or by employer policy. OSHA mandates it for certain workplaces, including logging operations, confined-space work, electrical power jobs, and commercial diving. Beyond those specific regulations, employers in healthcare, education, childcare, personal training, lifeguarding, and law enforcement routinely require it. Schools and daycare centers in many states require at least some staff members to hold current certification.
Even if your job doesn’t require it, the training is valuable. Cardiac arrest can happen anywhere, and the majority of out-of-hospital cardiac arrests occur at home. The skills transfer directly to helping a family member, neighbor, or stranger.
Legal Protection for Rescuers
Good Samaritan laws in every U.S. state protect bystanders who provide emergency care from civil liability if something goes wrong. If you crack someone’s rib while performing CPR (which is common and sometimes unavoidable), these laws shield you from a lawsuit. The protection covers ordinary mistakes that a reasonable person might make while trying to help.
The key limitation is that Good Samaritan protections generally don’t cover gross negligence. Performing CPR on someone who is clearly breathing, or attempting medical procedures far beyond your training level, could fall outside the law’s protection. Staying within what your certification taught you is both the safest approach for the person you’re helping and the strongest legal ground for you.