Cheat sheet
CABT Cheat Sheet
Reasoning & Problem Solving
- 24% of exam
- Unit Conversions Troubleshooting Logic Flowcharts Graph Interpretation
Medical Devices
- 23% of exam
- Patient Monitoring Therapeutic Devices Test Equipment Diagnostic Tools
Safety in Healthcare
- 16% of exam
- Electrical Safety Gas Color Codes PPE LOTO
Electronics Fundamentals
- 14% of exam
- Ohm's Law Circuit Basics Components ESD Protection
Healthcare IT
- 13% of exam
- Networking Computer Hardware Cybersecurity HIPAA
Anatomy & Physiology
- 10% of exam
- Body Systems Major Organs Circulatory Respiratory
Quick Facts
- Exam CABT
- Credential ACI Biomedical Tech Associate
- Questions 100 MC
- Time 2 hours
- Pass 75/100
- Format Online proctored
- Level Entry-level
- Blueprint 2025 ACI handbook
Unit Conversions RE
- 1 L 1,000 mL
- 1 kW 1,000 watts
- Body temp 37°C = 98.6°F
- F formula (C×9/5)+32
- C formula (F−32)×5/9
- OL reading Open circuit, infinite resistance
Troubleshooting Logic RE
- Process of elimination Rule out simplest cause first
- Flowchart Follow branches step by step
- Service manual Manufacturer troubleshooting reference
- Systematic approach Simple causes before complex
- Re-test loop Repair then verify pass
- Graph spike Investigate before replacing
Pulse Oximeter vs Capnography ME
Pulse Oximeter
- Measures SpO2
- Light through tissue
- Fingertip sensor
Capnography
- Measures EtCO2
- Exhaled breath CO2
- Confirms tube placement
- Oxygen vs carbon dioxide
Device Symptom to Likely Cause ME
- Cuff inflates, won't deflate → Check deflation valve/solenoid
- Blank display, device powers on → Check cable connection
- Air-in-line alarm sounds → Remove air from tubing
- Multimeter reads OL on fuse → Replace the fuse
- ECG shows 60 Hz noise → Check grounding first
- Defib energy below tolerance → Remove device, escalate repair
Patient Monitoring Devices ME
- Pulse oximeter Measures SpO2
- NIBP Non-invasive blood pressure
- ECG/EKG Heart electrical activity
- Capnography EtCO2 in exhaled breath
- Telemetry Wireless vital sign transmit
- Normal SpO2 95-100%
Therapeutic & Test Devices ME
- Defibrillator Shocks heart to normal rhythm
- Infusion pump Delivers precise IV fluids
- Air-in-line alarm Air bubble detected
- ESA Tests leakage current, grounding
- Multimeter Measures voltage, current, resistance
- Suction unit Clears airway secretions
Medical Gas Colors SA
- Oxygen Green, Nitrous Blue, Air Yellow, CO2 Gray
- O2: green N2O: blue Air: yellow CO2: gray
Microshock vs Macroshock SA
Microshock
- Direct cardiac pathway
- Under 1 mA lethal
- Bypasses skin resistance
Macroshock
- Over 100 mA threshold
- Through intact skin
- Skin resistance protects
- Direct heart vs skin path
Safety Hazard to Correct Response SA
- Direct cardiac lead present → Treat as microshock risk
- Mercury thermometer breaks → Ventilate, follow spill procedure
- Servicing de-energized equipment → Apply lock and tag
- Splash exposure risk → Wear gloves gown mask shield
- X-ray source nearby → Maximize distance, use shielding
- Chemical hazard question → Check the SDS
Electrical Safety Thresholds SA
- Microshock Under 1 mA direct to heart
- Macroshock Over 100 mA through skin
- LOTO De-energize before service
- Hospital-grade plug Green dot, stricter grounding
- Ground wire color Green or bare copper
- Radiation cardinal rules Time, distance, shielding
Shock Threshold Order SA
- Microshock under 1 mA; Macroshock over 100 mA
- Micro: direct heart Macro: through skin Micro needs far less current
Lock vs Tag (LOTO) SA
Lock
- Physically de-energizes
- Prevents re-activation
- Removed by owner
Tag
- Identifies who/why
- Warns other workers
- Never a substitute
- Prevent vs inform
Gas Color Codes & PPE SA
- Oxygen Green cylinder
- Nitrous oxide Blue cylinder
- Air Yellow cylinder
- Carbon dioxide Gray cylinder
- SDS Section 4 First-aid measures
- Splash PPE Gloves gown mask face shield
Radiation Safety Rules SA
- Time, Distance, Shielding: the three protection principles
- Time: minimize exposure Distance: maximize distance Shielding: use barriers
US Wiring Colors EL
- Black hot, White neutral, Green ground
- Black: hot White: neutral Green: ground
Fuse vs Circuit Breaker EL
Fuse
- Melts once
- Single-use device
- Cheap replacement
Circuit Breaker
- Trips, resets
- Reusable device
- Manual reset switch
- Replace vs reset
Electronics Fault to Test Tool EL
- Suspect blown fuse → Multimeter resistance test
- Need voltage from V=IR → Multiply current by resistance
- Board handling required → Wear ESD wrist strap
- Repeated circuit trips → Check breaker, not fuse
- Battery reads 0V DC → Check meter mode first
- Need device leakage check → Use electrical safety analyzer
Ohm's Law & Circuit Basics EL
- Ohm's Law V = I × R
- Current formula I = V / R
- Resistance formula R = V / I
- Series voltage Sum of drops
- AC Alternating direction current
- DC One-direction current
AC vs DC EL
AC
- Alternating direction
- Wall outlet power
- Changes polarity
DC
- One direction only
- Battery power
- Constant polarity
- Alternating vs direct
Components & Protection EL
- Fuse Melts, opens on overcurrent
- Circuit breaker Resettable overcurrent protection
- Capacitor Stores electrical charge
- Transformer Changes voltage level
- ESD strap Grounds technician, protects chips
- Hot wire color Black (US standard)
LAN vs WAN HE
LAN
- Local network
- Single building/site
- Faster, closer
WAN
- Wide-area network
- Multiple sites
- Connects LANs together
- Local vs wide area
Networking Basics HE
- LAN Local network
- WAN Wide-area network
- VLAN Segmented virtual network
- VPN Encrypted remote tunnel
- Firewall Filters network traffic
- Network cable Ethernet/RJ-45 connector
Computer Hardware & Security HE
- CPU Processes instructions
- RAM Temporary working memory
- SSD Solid-state storage
- USB Universal peripheral connector
- HIPAA Protects patient health data
- Phishing Fake message steals credentials
Body Systems AN
- Respiratory system Lungs exchange oxygen, CO2
- Circulatory system Heart pumps blood
- Nervous system Brain controls body signals
- Blood Carries oxygen, nutrients
- Blood vessels Arteries, veins, capillaries
- Skin Body's protective barrier
Major Organs AN
- Heart Pumps blood, 4 chambers
- Lungs Gas exchange organ
- Kidneys Filter blood, make urine
- Brain Controls nervous system
- Normal HR 60-100 bpm adult
- Normal EtCO2 35-45 mmHg
Common Traps
Microshock ≠ Macroshock
- Microshock: direct heart, tiny current ≠ Macroshock: skin path, large current
Fuse ≠ Circuit Breaker
- Fuse melts, single use ≠ Breaker trips, resettable
Pulse Oximeter ≠ Capnography
- Oximeter measures blood oxygen ≠ Capnography measures exhaled CO2
Lock ≠ Tag (LOTO)
- Lock physically prevents power ≠ Tag only identifies, warns
AC ≠ DC
- AC alternates direction constantly ≠ DC flows one direction
LAN ≠ WAN
- LAN is local, single-site ≠ WAN connects distant sites
Last Minute
- 1. Weights 24-23-16-14-13-10%
- 2. Ohm's Law: V = I×R
- 3. Microshock: under 1 mA, heart
- 4. Macroshock: over 100 mA, skin
- 5. Oxygen green; nitrous oxide blue
- 6. LOTO needs lock plus tag
- 7. Normal SpO2 is 95-100%
- 8. Fuse melts; breaker resets itself
- 9. SDS Section 4 is first-aid
- 10. 100 Qs, 2 hrs, pass 75
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