A BLS course teaches you how to keep someone alive during cardiac arrest or a breathing emergency until advanced medical help arrives. BLS stands for Basic Life Support, and the training covers high-quality CPR, rescue breathing, AED use, and choking relief for adults, children, and infants. Most people complete the course in a single day, and certification is valid for two years.
What BLS Training Covers
The core of any BLS course is built around three critical actions: recognizing cardiac arrest quickly, performing effective chest compressions, and using an automated external defibrillator (AED) as soon as one is available. These three steps form what’s known as the Chain of Survival, and the course is structured to make each one feel automatic under pressure.
Beyond those fundamentals, the course walks through a broader set of skills:
- Scene safety and assessment: checking that the environment is safe before approaching, then determining whether the person is responsive and breathing normally.
- Chest compressions for adults, children, and infants: each age group requires different hand placement, depth, and technique. For adults, current guidelines emphasize positioning the patient’s torso at about the level of your knees, which improves compression depth.
- Rescue breathing and ventilation: delivering breaths using a pocket mask or a bag-valve-mask device, giving just enough air to produce visible chest rise without over- or under-ventilating.
- AED operation: powering on the device, placing pads correctly on adults, children, and infants, and following the prompts to deliver a shock when indicated.
- Choking relief: clearing a foreign-body airway obstruction in adults, children, and infants.
- Team-based CPR: coordinating roles during a two-rescuer scenario, including switching between compressions and ventilations without losing rhythm.
The curriculum reflects the 2025 American Heart Association Guidelines for CPR and Emergency Cardiovascular Care, so the techniques you learn are based on the most current evidence.
Who Needs BLS Certification
BLS certification is primarily designed for healthcare professionals and public safety workers. Nurses, physicians, paramedics, EMTs, dentists, and respiratory therapists commonly need it to maintain their credentials or satisfy employer requirements. Many hospitals and clinics require active BLS certification as a condition of employment.
It differs from a standard CPR class in scope and rigor. A community CPR course teaches the basics of hands-only compression and might briefly cover AED use. BLS goes further by training you in bag-valve-mask ventilation, multi-rescuer coordination, and infant-specific techniques. If your job could put you in a position to respond to a cardiac or respiratory emergency in a clinical setting, BLS is typically what’s expected.
How the Course Works
You can take a BLS course in two main formats. The fully instructor-led option runs about 4 to 5 hours in a single session. You’ll work through lessons with an instructor, practice on manikins, and complete your skills test the same day.
The blended learning option splits the course into two parts. First, you complete 1 to 2 hours of self-paced online content, which includes interactive modules and knowledge checks. Then you attend a 2 to 3 hour in-person skills session where an instructor watches you demonstrate compressions, ventilation, and AED use on manikins. Some blended programs also offer a voice-assisted manikin option for the hands-on portion, though availability varies by training center.
Both formats end with a skills test. You’ll be evaluated on adult CPR with AED use and on infant CPR, demonstrating proper compression depth, rate, hand placement, and ventilation technique. There is also a written or adaptive knowledge assessment. For those renewing an existing certification, some providers use computer adaptive testing that can cut exam time in half by adjusting question difficulty based on your demonstrated competency.
BLS vs. ACLS
BLS and ACLS (Advanced Cardiovascular Life Support) are often mentioned together, and it helps to understand where one ends and the other begins. BLS focuses on keeping blood and oxygen circulating through CPR, basic airway management, and early defibrillation. The goal is to maintain life functions until more advanced care is available.
ACLS builds on that foundation with interventions like IV access, medication administration, advanced airway management, and electrical therapies beyond standard AED use. It also covers protocols for acute heart rhythms, stroke, and post-cardiac arrest care. ACLS is typically required for physicians, nurses working in emergency or critical care settings, and paramedics. You generally need a current BLS certification before enrolling in an ACLS course.
Certification and Renewal
BLS certification lasts two years from the date you complete the course. When it’s time to renew, you’ll retake the course, though renewal sessions are often shorter since the material is a refresher rather than brand new. The American Heart Association and the American Red Cross are the two most widely recognized providers, and most employers accept certification from either one. Some workplaces have a preference, so it’s worth checking before you register.
The certification card you receive, whether digital or physical, lists your name, completion date, and expiration date. Many employers require you to keep this current without any lapse, particularly in hospital and EMS settings where response readiness is non-negotiable.