BLS stands for Basic Life Support, a set of emergency skills that every nurse is required to learn and maintain throughout their career. It covers CPR, rescue breathing, choking relief, and the use of an automated external defibrillator (AED). The American Heart Association describes BLS as “the foundation for saving lives after cardiac arrest,” and for nurses specifically, it represents both a clinical competency and a professional obligation.
What BLS Covers
BLS training teaches you to recognize cardiac arrest, maintain blood flow and oxygen delivery through chest compressions and rescue breaths, clear airway obstructions, and use an AED to restore a normal heart rhythm. It also covers how to open a blocked airway using positioning techniques like the head-tilt chin-lift, and how to use oral airway devices that help keep the airway clear during resuscitation.
The skills apply across three patient populations: adults, children, and infants. Each has slightly different techniques. For adults, you compress the chest at least 2 inches deep (but no more than 2.4 inches) and deliver 30 compressions followed by 2 rescue breaths. Children ages 1 through puberty get the same depth range with one or both hands depending on their size. For infants, compressions are gentler, about 1.5 inches deep.
When two healthcare providers respond together, the ratios change for pediatric and infant patients. Instead of 30 compressions to 2 breaths, two-rescuer CPR uses 15 compressions to 1 or 2 breaths. This higher breath-to-compression ratio reflects the fact that respiratory problems, rather than heart problems, are the more common cause of cardiac arrest in younger patients.
Why Nurses Are Required to Have It
Nurses are often the first clinical professionals at a patient’s side when something goes wrong. In a hospital, a nurse discovering an unresponsive patient needs to act immediately: confirm the patient has no pulse and isn’t breathing normally, call for the emergency response team, and begin CPR right away. The time between cardiac arrest and the start of compressions is one of the strongest predictors of survival, which is why BLS competency isn’t optional for nurses.
This obligation is both ethical and legal. The Texas Board of Nursing, for example, states plainly that all nurses have a duty to initiate CPR for patients who need it, regardless of expertise, specialty, or practice setting. The only exception is when a valid do-not-resuscitate order is in place. The board’s position is rooted in a landmark case (Lunsford v. Board of Nurse Examiners) that established that when a nurse knows or should know a situation places a patient at risk, the nurse has a duty to intervene. Failing to act can be considered unprofessional conduct. While specific rules vary by state, this general principle holds across nursing practice nationwide.
How AED Use Fits In
An AED is a portable device that analyzes the heart’s rhythm and delivers an electric shock if needed. BLS training teaches you to use one alongside CPR, not as a replacement for it. When an AED is available, you turn it on, place the adhesive pads on the patient’s bare chest, and follow the device’s voice prompts. The AED determines whether a shock is appropriate. If it advises a shock, everyone steps away from the patient, the shock is delivered, and you immediately resume compressions.
A key point emphasized in training: don’t stop CPR to wait for an AED. If someone else is available, send them to get it while you continue compressions. Every pause in chest compressions means less blood reaching the brain and heart.
How BLS Differs From ACLS
BLS and ACLS (Advanced Cardiovascular Life Support) are often confused, but they represent different tiers of emergency response. BLS uses no medications and minimal equipment. Its goal is to keep blood and oxygen circulating until advanced care arrives. ACLS builds on BLS with interventions like IV access, cardiac medications, advanced airway management, and electrical therapies beyond basic defibrillation.
Not every nurse needs ACLS. BLS is universally required across all nursing roles. ACLS is typically expected for nurses working in emergency departments, intensive care units, cardiac units, and other critical care settings where they may need to manage complex cardiac rhythms, administer resuscitation medications, or handle post-cardiac-arrest stabilization. Nurses in outpatient clinics, long-term care, school nursing, or community health generally need only BLS.
Getting and Keeping Your Certification
BLS certification for healthcare providers is offered through the American Heart Association and the American Red Cross, the two most widely recognized issuing organizations. Courses are designed specifically for healthcare professionals and go beyond what a layperson CPR class covers, including two-rescuer techniques, airway adjunct use, and team-based resuscitation practice.
Certification is valid for two years. After that, you take a recertification course to refresh your skills and extend your credential. Most hospitals and healthcare employers verify current BLS status at hiring and at each renewal cycle. If your certification lapses, the Red Cross allows you to take a renewal course within 30 days of expiration without needing to retake the full initial course.
Nursing students typically complete BLS certification early in their program, often before clinical rotations begin. The course itself usually takes a few hours and includes both knowledge review and hands-on skills testing with manikins. You’ll practice compressions, ventilations, and AED use on adult, child, and infant models and need to demonstrate competency in each before receiving your certification card.
What It Looks Like in Practice
In a hospital setting, a nurse who finds an unresponsive patient follows a rapid sequence: confirm the patient isn’t responsive and isn’t breathing normally, check for a pulse (taking no more than 10 seconds), activate the code team, and begin compressions immediately. While performing CPR, the nurse or a colleague places defibrillator pads, starts an IV line, connects cardiac monitoring leads, and prepares the resuscitation cart. The nurse documents events and times throughout the response.
Outside the hospital, the sequence is simpler but equally urgent. A nurse encountering someone in cardiac arrest at a community event, on an airplane, or in a clinic calls emergency services, starts CPR, and uses a public AED if one is available. BLS skills are designed to work with little or no equipment, which is exactly what makes them so foundational. Whether you’re in a fully stocked ICU or a grocery store parking lot, the core actions are the same: compress hard, compress fast, deliver breaths, and defibrillate as soon as possible.