Basic Life Support (BLS) is the professional resuscitation certification required of clinicians and first responders. It is valid for two years. Renewal requires completing a BLS Provider course either fully in person or through blended learning, where coursework is finished online and skills are tested in person. No legitimate BLS card is issued from an online-only course.
Basic Life Support is the entry-level professional standard for responding to cardiac arrest, respiratory arrest, and airway obstruction. It sits below Advanced Cardiovascular Life Support (ACLS) and Pediatric Advanced Life Support (PALS) in the resuscitation hierarchy, and above layperson CPR.
The certification covers six competency areas: recognition of arrest, high-quality chest compressions, ventilation with a barrier or bag-mask device, defibrillation with an AED, relief of foreign-body airway obstruction, and coordinated multi-rescuer team response.
It is issued primarily by the American Heart Association and the American Red Cross. Both build their curricula on consensus science from the International Liaison Committee on Resuscitation, which is translated into practice through the AHA Guidelines for CPR and Emergency Cardiovascular Care, revised on roughly a five-year cycle.
During cardiac arrest, the heart stops generating forward blood flow. Brain tissue begins sustaining injury within about four to six minutes of no perfusion. Chest compressions do not restart the heart; they buy time by generating roughly 20–30% of normal cardiac output, which is enough to keep the brain and myocardium marginally viable until defibrillation or advanced care arrives.
Defibrillation is the definitive treatment for shockable rhythms (ventricular fibrillation and pulseless ventricular tachycardia). Compressions are the bridge to it.
The scale of the problem, per American Heart Association surveillance data:
Cardiovascular disease remains the leading cause of death in the United States, killing roughly one person every 33 seconds according to the Centers for Disease Control and Prevention. That is the population BLS-trained clinicians encounter.
CPR is a technique. BLS is a certification containing that technique plus several others, taught to a professional standard and verified by examination.
Layperson CPR (Heartsaver) | BLS Provider | |
Audience | General public, workplace responders, teachers, parents | Nurses, physicians, EMTs, dentists, PAs, RTs, clinical students |
Compressions | Yes | Yes, with feedback-device accuracy standards |
Rescue breaths | Barrier device only | Barrier and bag-mask device, one- and two-rescuer |
Pulse checks | Not taught | Taught and tested (carotid, brachial) |
AED | Basic operation | Operation plus integration into compression cycles |
Team resuscitation | No | Yes — role assignment, closed-loop communication, compressor rotation |
Age groups | Primarily adult | Adult, child, and infant in full |
Advanced airway ventilation | No | Yes |
Opioid emergency response | Sometimes | Yes |
Assessment | Skills practice | Written exam plus proctored skills test |
Course length | 2–3 hours | 3.5–4.5 hrs initial; ~3 hrs renewal |
Validity | 2 years | 2 years |
Accepted for clinical employment | Rarely | Yes, this is the standard |
The practical consequence: a generic “CPR certification” card usually will not clear a hospital, clinic, dental practice, or nursing program credentialing office. AHA BLS cards state “BLS Provider” on their face.
Resuscitation outcomes depend on a sequence of linked interventions, not a single act. The AHA describes two separate chains because the failure points differ.
Out-of-hospital cardiac arrest:
In-hospital cardiac arrest:
The first link differs meaningfully. Outside the hospital, the priority is a bystander recognizing arrest and calling for help. Inside a hospital, most arrests are preceded by hours of physiological deterioration, so the first link is surveillance and prevention — recognizing the deteriorating patient before the arrest happens. That distinction is a core teaching point in the BLS Provider course and one reason the healthcare version differs from consumer training.
These are the measurable targets taught and tested in the course.
Parameter | Standard |
Compression rate | 100–120 per minute |
Adult compression depth | At least 2 inches (5 cm), not exceeding 2.4 inches (6 cm) |
Child compression depth | About one-third of chest depth, roughly 2 inches |
Infant compression depth | About one-third of chest depth, roughly 1.5 inches |
Chest recoil | Full recoil between compressions; no leaning |
Compression fraction | Greater than 60%, with 80% as the target |
Interruptions | Under 10 seconds |
Pulse check | No longer than 10 seconds |
Ratio — adult, single or two-rescuer | 30:2 |
Ratio — child/infant, single rescuer | 30:2 |
Ratio — child/infant, two rescuers | 15:2 |
Ventilation with advanced airway | Continuous compressions with asynchronous breaths |
Compressor rotation | Every 2 minutes, handoff under 5 seconds |
Ventilation volume | Enough for visible chest rise, delivered over 1 second |
Two of these cause most real-world quality failures. Leaning on the chest between compressions reduces venous return and ventricular refilling, silently degrading output even when rate and depth look correct. And compression fraction — the share of arrest time in which compressions are actively delivered — is the metric most degraded by unnecessary pauses for rhythm analysis, intubation attempts, and rescuer changes.
Adult | Child (1 yr to puberty) | Infant (under 1 yr) | |
Hand position | Two hands, lower half of sternum | One or two hands, lower half of sternum | Two fingers (single rescuer) or two-thumb encircling (two rescuers) |
Pulse check site | Carotid | Carotid or femoral | Brachial |
Two-rescuer ratio | 30:2 | 15:2 | 15:2 |
AED pads | Adult pads | Pediatric pads preferred; adult acceptable if unavailable | Manual defibrillator preferred; AED with pediatric attenuator acceptable |
Choking relief (responsive) | Abdominal thrusts | Abdominal thrusts | 5 back slaps + 5 chest thrusts |
Likely arrest cause | Primary cardiac | Often respiratory | Usually respiratory |
The etiology row explains a lot. Adult arrest is typically a sudden cardiac event, so compressions and rapid defibrillation dominate. Pediatric arrest is usually the endpoint of respiratory failure or shock, which is why ventilation carries more weight in pediatric ratios and why the two-rescuer ratio drops to 15:2.
The requirement is usually set by the employer or academic program rather than by state law directly, though it frequently traces back to workplace first-aid obligations and accreditation standards for healthcare organizations. Licensing boards vary by state and profession, so verifying with your own board is worth the five minutes.
The BLS Provider course is standardized nationally, so content does not vary by training center. It covers:
Assessment structure: a written exam, typically 25 questions with a passing score of 84%, plus a proctored hands-on skills test on adult and infant manikins. The skills test is the reason a valid BLS card cannot be issued from an online-only course.
Two years from the issue date. AHA eCards carry an issue date and a recommended renewal date, and most expire at the end of the month two years out. A card issued March 14, 2024 typically expires March 31, 2026.
There is no grace period. Employers generally treat a lapsed card as no certification at all, regardless of whether a renewal class is already booked. Some hospital systems remove staff from patient assignments on the expiration date.
The two-year interval is a compromise, not a physiological finding. Studies of resuscitation skill retention consistently show measurable decay within three to six months of training, with chest compression quality and bag-mask ventilation degrading fastest. That research is why many hospitals now supplement biennial certification with quarterly low-dose, high-frequency refresher sessions on feedback manikins.
Practical rule: book renewal 30 to 60 days before expiration.
Not entirely. Any provider advertising a fully online BLS certification with an instant printable card is issuing a document most hospitals, nursing programs, and licensing boards will reject, because no skills evaluation took place.
What is legitimate is blended learning. The AHA version is called HeartCode BLS, and it has two mandatory parts:
Part one — online cognitive portion. One to two hours of self-paced interactive modules, video scenarios, and adaptive practice, ending in the written exam. Genuinely can be done at 2 a.m. between shifts.
Part two — in-person hands-on skills session. Thirty to sixty minutes with a certified instructor, demonstrating compressions, bag-mask ventilation, AED use, and choking relief. The official eCard is issued after passing this.
So the accurate framing is: coursework online, skills in person, one card. Before paying any provider, ask one question — does this include an in-person hands-on skills evaluation, and is the card issued through the official AHA eCard system? The answer sorts legitimate training from card mills immediately.
You will generally need the full BLS Provider course rather than the abbreviated renewal. Policies vary slightly by training center — some allow renewal format within a short window past expiration — but AHA guidance leans toward the full course once a card has lapsed.
The resulting card is identical, with the same two-year validity. The difference is roughly one additional hour of class time.
The failures instructors see are predictable, and they are almost always rust rather than incapability.
Five minutes of review the night before changes outcomes. If you feel rusty, say so on arrival — a good instructor will give you a practice run before testing begins.
Is BLS the same as CPR certification?
No. CPR is a skill within BLS. BLS is a professional certification adding bag-mask ventilation, pulse checks, AED integration, pediatric protocols, team resuscitation, and a proctored skills exam.
How long is BLS certification valid?
Two years, usually expiring at the end of the month two years after issue.
Can I renew BLS 100% online?
No. Coursework can be completed online through blended learning, but an in-person hands-on skills evaluation is required for a valid card.
What is the difference between AHA and Red Cross BLS?
Both follow the same underlying consensus science and both are widely accepted. AHA is more commonly specified in hospital settings. Check your employer’s policy.
How long does a renewal class take?
About three hours in person, or one to two hours online plus a 30–60 minute skills session with blended learning.
Is there a grace period after expiration?
No. Once expired, you will typically need the full BLS Provider course rather than the shorter renewal.
Do I need BLS for nursing school?
Almost always, before the first clinical rotation. Most programs specify the AHA BLS Provider card.
What is the passing score?
Typically 84% on the written exam, plus successful completion of the proctored skills test.
Will I receive a physical card?
Most BLS credentials are now digital eCards emailed within 24–48 hours. You can download and print a copy.
Does BLS transfer between states?
Yes. AHA and Red Cross BLS certifications are nationally recognized.
Comfi-Kare CPR provides AHA-aligned Basic Life Support training for healthcare professionals. Current formats are on the BLS Provider course page.