3.0 Adult BLS (1- and 2-Rescuer) BLS Practice Quiz
66 exam-style questions covering 22% of the BLS exam. Instant feedback on every answer, progress tracking, no signup required.
This domain is part of the Basic Life Support (BLS) practice test. Each question is tagged by exam objective and difficulty so you can drill exactly the areas you need.
Sample Questions
You arrive at the side of an unresponsive-appearing adult on the floor. According to the AHA Adult 1-Rescuer BLS Sequence, what is your very first step?
- A. Begin chest compressions immediately from where you are standing
- B. Verify that the scene is safe before approaching
- C. Apply AED pads before any other action
- D. Move the person to the recovery position
AHA Part 3 makes Step 1 of the Adult 1-Rescuer sequence verifying scene safety so the rescuer does not become an additional victim.
When performing CPR alone on an unresponsive adult in cardiac arrest, what compression-to-ventilation ratio does AHA Part 3 specify?
- A. 15 compressions to 2 breaths
- B. 30 compressions to 2 breaths
- C. 5 compressions to 1 breath
- D. 100 continuous compressions before any breath
AHA Part 3 specifies 30 compressions to 2 breaths for the single-rescuer adult ratio.
You confirm an unresponsive adult is not breathing normally and has no pulse. You are alone with a mobile phone. According to AHA Part 3, what is the recommended order of next actions for a lone rescuer at an adult cardiac arrest?
- A. Begin 5 cycles of CPR before any activation
- B. Activate the emergency response system on speakerphone, and if an AED is nearby retrieve it, then begin CPR
- C. Drive the person to the hospital before any care
- D. Wait for someone else to arrive before doing anything
AHA Part 3 directs the lone rescuer at an adult arrest to activate EMS, using a mobile speakerphone if available, and retrieve a nearby AED before starting CPR.
AHA's in-hospital skills testing scenario describes a person who suddenly collapsed in a hallway. The student is told the scene is safe and to demonstrate their next action. Which initial action does the checklist evaluate?
- A. Place the patient in a wheelchair to transport to the unit
- B. Check responsiveness, shout for help, send a coworker for the AED, and assess breathing and pulse
- C. Document the time of collapse on a clipboard
- D. Remove the patient's clothing entirely before approaching
The in-hospital scenario evaluates checking responsiveness, shouting for help, sending someone for the AED, and assessing breathing and pulse, the opening sequence of adult BLS.
AHA's adult 2-rescuer skills testing scenario provides a pocket mask once the second rescuer arrives. Which task does the checklist expect this rescuer to perform?
- A. Document the resuscitation while the first rescuer continues alone
- B. Provide chest compressions only and skip ventilations
- C. Provide 2 breaths with a barrier device after every 30 compressions
- D. Wait outside the room until ALS arrives
The AHA Adult CPR and AED Skills Testing Critical Descriptors include providing 2 breaths with a barrier device after every 30 compressions in the 2-rescuer scenario.
The AHA Adult CPR and AED Skills Testing Checklist lists critical descriptors for the testing scenario. Which set of actions appears as critical adult skills test items?
- A. Performing compressions over clothing without exposing the chest
- B. Replacing all family members in the room before any care
- C. Correct hand placement on the lower half of the sternum, providing breaths with a barrier device, and minimizing interruptions
- D. Verifying that the AED has not been used in the past year
The AHA Adult CPR and AED Skills Testing Critical Descriptors include correct hand placement on the lower half of the sternum, giving breaths with a barrier device, and minimizing interruptions in compressions.
AHA Part 5 describes how compressors should switch positions during a sustained adult resuscitation to maintain CPR quality. Which approach matches?
- A. Compressors should switch sides every 30 seconds during compressions
- B. The second compressor should take over on the same side as the initial compressor, between cycles every 2 minutes
- C. Compressors switch only after the resuscitation has run 20 minutes
- D. Compressors should change between every breath delivery
AHA Part 5 says when switching compressors, the second compressor should take over on the same side as the initial compressor, and for seamless transitions to switch between cycles every 2 minutes.
AHA Part 5 lists specific responsibilities for the Monitor/Defibrillator on a high-performance adult BLS team. Which item appears in that list?
- A. Performs all chest compressions personally
- B. Replaces the Team Leader during every rhythm check
- C. Records the frequency and duration of interruptions in compressions
- D. Provides bag-mask ventilation throughout the code
AHA Part 5 lists recording the frequency and duration of interruptions in compressions as a Monitor/Defibrillator responsibility.
Key Terms in This Domain
- Compression-to-Ventilation Ratio: 30:2 for single-rescuer adult/child/infant. 15:2 for 2-rescuer infant/child. Continuous compressions with advanced airway.
- Rescue Breathing: Without compressions: 1 breath every 6 seconds (adults), 1 every 2-3 seconds (children/infants). Each breath ~1 second.
- Switching Compressors: Rotate every 2 minutes (or every 5 cycles of 30:2) to maintain compression quality. Minimize pause to <5 seconds.
- Compression Rate: 100-120 compressions per minute for all ages.
- Pulse Check: Adult/child: carotid pulse (or femoral). Infant: brachial pulse. Check no more than 10 seconds.
- Bag-Mask Ventilation: Two-hand E-C clamp technique preferred. Visible chest rise with each breath, ~1 second per breath.
- High-Quality CPR: Push hard (≥2 in / 5 cm adults), push fast (100-120/min), allow full recoil, minimize interruptions, and avoid excessive ventilation.
- Compression Depth: Adults: ≥2 inches (5 cm). Child: ~2 inches (5 cm) or 1/3 chest depth. Infant: ~1.5 inches (4 cm) or 1/3 chest depth.
- Chest Recoil: Allow the chest to return fully between compressions; leaning prevents venous return and reduces CPR effectiveness.
- AED Use: Turn on, attach pads, allow rhythm analysis, clear and shock if advised, resume CPR immediately for 2 minutes.
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Other BLS Domains
- 1.0 Course Concepts and Chain of Survival
- 2.0 Assessment and High-Performance Teams
- 4.0 Pediatric BLS (Children and Infants)
- 5.0 AED for All Ages
- 6.0 Alternate Ventilation and Advanced Airways
- 7.0 Choking Relief Across Ages
- 8.0 Special Emergencies and Recovery
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