ABC Certified Prosthetic Technician (CTP) — Questions and Answers

Question 1: What is the correct technique for removing contaminated gloves to avoid hand contamination?

Rinse gloved hands under water before removing
Grasp the outside of one glove cuff and peel it off, then slide fingers under the second glove's cuff to remove it (Correct answer)
Use scissors to cut the gloves off at the wrist
Pull both gloves off simultaneously by the fingertips

Correct answer: Grasp the outside of one glove cuff and peel it off, then slide fingers under the second glove's cuff to remove it

The standard doffing technique peels the first glove inside-out from the cuff, then uses the bare finger under the second cuff to keep clean skin from touching the contaminated outer surface.

Question 2: What is the appropriate retention period for professional records?

As specified by state/federal law and professional licensing requirements (Correct answer)
Until storage space runs out
One year after the last service
Only as long as the client remains active

Correct answer: As specified by state/federal law and professional licensing requirements

Record retention must follow state/federal laws and professional licensing requirements, which typically specify minimum retention periods for different record types.

Question 3: Which suspension system uses a shuttle lock mechanism where a pin attached to the liner clicks into a locking distal housing?

Suction suspension
Neoprene sleeve suspension
Pin lock suspension (Correct answer)
Elevated vacuum suspension

Correct answer: Pin lock suspension

Pin lock suspension systems feature a pin at the distal end of the liner that engages a ratchet-style lock in the socket, providing mechanical suspension.

Question 4: Which is a sign that a prosthesis may need repair or adjustment?

Visible logo on socket
Shiny surface finish
Smooth gait pattern
Audible noises during walking (Correct answer)

Correct answer: Audible noises during walking

Audible noises such as squeaking, clicking, or clunking during walking are often indicators of mechanical issues within the prosthesis, such as loose components, worn joints, or improper alignment. These noises signal that the device may require inspection, repair, or adjustment to restore proper function and prevent further damage.

Question 5: What should be done if an error is discovered in existing records?

Remove the page and rewrite it
Use correction fluid to cover the error
Draw a single line through the error, note the correction, date, and initial (Correct answer)
Ignore the error if it seems minor

Correct answer: Draw a single line through the error, note the correction, date, and initial

The correct method is a single line through the error with a dated and initialed correction, preserving the original entry for legal and audit purposes.

Question 6: Which regulation governs proper disposal of sharp objects such as drills and saw blades used in prosthetic fabrication?

State health department food-service codes
OSHA Bloodborne Pathogen Standard for sharps disposal (Correct answer)
FDA device disposal guidelines
EPA hazardous waste regulations only

Correct answer: OSHA Bloodborne Pathogen Standard for sharps disposal

OSHA's Bloodborne Pathogen Standard requires proper sharps disposal containers and procedures to protect workers from percutaneous injury.

Question 7: When documenting residual limb shape for socket design, a 'dog-eared' appearance refers to:

Adequate conical shaping of the residual limb
Redundant soft tissue folds at the distal end or corners of the closure (Correct answer)
Scar contracture pulling skin toward the bone
Excessive bony prominence at the fibular head

Correct answer: Redundant soft tissue folds at the distal end or corners of the closure

Dog-ears are redundant tissue folds often seen at surgical closure corners; they create fitting challenges and pressure concentration in the prosthetic socket.

Question 8: Which suspension system for a transtibial prosthesis requires the least amount of residual limb volume stability to function effectively?

Simple sleeve suspension
Supracondylar suspension with wedge
Elevated vacuum suspension (Correct answer)
Locking liner pin system

Correct answer: Elevated vacuum suspension

Elevated vacuum suspension actively compensates for volume fluctuation by maintaining negative pressure within the socket, making it most tolerant of volume changes.

Question 9: What is the purpose of using a cast saw in prosthetic fabrication?

To bond components
To apply lamination
To polish the socket
To cut and trim cast materials (Correct answer)

Correct answer: To cut and trim cast materials

A cast saw is a specialized tool used in prosthetic fabrication to safely and precisely cut and trim plaster or fiberglass cast materials. This is crucial during the initial stages of creating a mold from the patient's residual limb, allowing for accurate shaping and removal of excess material.

Question 10: In a prosthetics lab, which waste stream requires disposal as regulated medical waste (biohazardous waste)?

Spent grinding wheels
Soiled casting materials with blood or body fluids (Correct answer)
Used sandpaper from finishing carbon fiber
Empty resin containers

Correct answer: Soiled casting materials with blood or body fluids

Casting materials contaminated with blood or body fluids meet the definition of regulated medical waste and must be disposed of per OSHA and state biohazard waste regulations.

Question 11: Under OSHA standards, which hazard communication element must be present on all containers of hazardous chemicals used in a prosthetics lab?

Material Safety Data Sheet inside the container
GHS-compliant label with pictograms and signal word (Correct answer)
Employee signature acknowledging hazard awareness
Manufacturer's telephone number only

Correct answer: GHS-compliant label with pictograms and signal word

OSHA's Hazard Communication Standard (HazCom 2012) requires GHS-compliant labels including pictograms, signal words, and hazard statements on all hazardous chemical containers.

Question 12: What does the term 'sharps container fill line' indicate in a prosthetics lab context?

The container must be weighed when this line is reached
The container should be closed and replaced when waste reaches this line (Correct answer)
The container can hold 25% more after this line
The fill line is only relevant in medical settings, not prosthetics labs

Correct answer: The container should be closed and replaced when waste reaches this line

Sharps containers should be sealed and replaced when waste reaches the indicated fill line to prevent overfilling and needle-stick injuries.

Question 13: When applying a roll-on silicone liner prior to donning a prosthesis, what is the correct technique?

Wet the residual limb before rolling the liner on
Apply the liner inside-out and then roll it down
Roll the liner onto the limb from distal to proximal, expelling air (Correct answer)
Pull the liner over the limb from proximal to distal

Correct answer: Roll the liner onto the limb from distal to proximal, expelling air

Rolling the liner from distal to proximal expels trapped air and ensures full contact between the liner and the residual limb skin.

Question 14: Why is silicone frequently used in prosthetic liners?

It helps with lamination
It improves shock absorption and comfort (Correct answer)
It's the cheapest option
It creates a rigid structure

Correct answer: It improves shock absorption and comfort

Silicone is frequently used in prosthetic liners because its viscoelastic properties allow it to effectively absorb shock and distribute pressure. This material conforms well to the residual limb, providing a soft, cushioning interface that significantly enhances comfort and reduces skin irritation for the user during daily activities.

Question 15: What type of wrist unit allows a transradial prosthesis user to pre-position the terminal device in multiple planes of rotation?

Rigid wrist unit
Flexion wrist unit with a single hinge
Locking wrist unit only with extension
Flexion-rotation wrist unit (flexion/extension and rotation) (Correct answer)

Correct answer: Flexion-rotation wrist unit (flexion/extension and rotation)

A flexion-rotation wrist unit provides both wrist flexion/extension and forearm rotation positioning, enabling the user to pre-set the terminal device for varied tasks.

Question 16: What is the primary advantage of an elevated vacuum suspension (EVS) system over a standard suction socket?

Actively maintains negative pressure to control volume and improve proprioception (Correct answer)
Eliminates the need for a prosthetic liner entirely
Allows the patient to don the prosthesis without using a liner
Reduces the overall weight of the prosthesis significantly

Correct answer: Actively maintains negative pressure to control volume and improve proprioception

Elevated vacuum suspension actively pumps air from between the liner and socket wall, maintaining consistent negative pressure that controls residual limb volume and enhances sensory feedback.

Question 17: Which section of a prosthetic patient record documents the patient's residual limb measurements and shape?

Delivery record
Plan of care
Evaluation/assessment (Correct answer)
Progress note

Correct answer: Evaluation/assessment

The evaluation or assessment section captures objective data including residual limb measurements, shape, skin condition, and volume.

Question 18: A patient with a partial foot amputation through the Lisfranc joint is most likely to experience which functional problem without a prosthetic intervention?

Increased lumbar lordosis
Equinus deformity and loss of push-off (Correct answer)
Hip drop during swing phase
Excessive knee hyperextension during midstance

Correct answer: Equinus deformity and loss of push-off

Lisfranc-level amputations remove the forefoot lever arm and disrupt push-off mechanics, often leading to an equinus deformity as the calf muscles become unopposed.

Question 19: Which property of skeletal muscle allows it to return to its resting length after being stretched, important for residual limb volume stability?

Excitability
Extensibility
Elasticity (Correct answer)
Contractility

Correct answer: Elasticity

Elasticity is the ability of muscle tissue to recoil to its original length after stretching, contributing to consistent residual limb shape.

Question 20: Which federal law primarily governs the privacy and security of protected health information (PHI) in the United States?

Americans with Disabilities Act (ADA)
Health Insurance Portability and Accountability Act (HIPAA) (Correct answer)
Occupational Safety and Health Act (OSHA)
False Claims Act

Correct answer: Health Insurance Portability and Accountability Act (HIPAA)

HIPAA is the primary federal law protecting PHI privacy and security in healthcare settings.

Question 21: What is the benefit of using a modular prosthetic system?

They require no tools
They are less durable
They are fixed permanently
They allow easy adjustments and repairs (Correct answer)

Correct answer: They allow easy adjustments and repairs

Modular prosthetic systems are designed with interchangeable components that can be easily assembled, disassembled, and replaced. This modularity allows prosthetists to make fine-tuned adjustments to alignment, height, and component selection, and facilitates efficient repairs or upgrades without needing to replace the entire prosthesis.

Question 22: When a prosthetics company acquires another practice, which regulatory requirement must be addressed regarding existing Medicare supplier agreements?

The new owner must enroll separately in PECOS and obtain a new supplier number (Correct answer)
The new owner automatically inherits the billing number with no action needed
The FDA must approve the ownership transfer before billing can continue
Only state licensure re-application is required

Correct answer: The new owner must enroll separately in PECOS and obtain a new supplier number

Medicare supplier numbers and billing agreements are not automatically transferable; new owners must complete a fresh PECOS enrollment.

Question 23: What should a practitioner do when regulations conflict with employer policies?

Ignore both and use personal judgment
Follow the regulation, as legal requirements supersede employer policies (Correct answer)
Always follow employer policies
Follow whichever is easier to comply with

Correct answer: Follow the regulation, as legal requirements supersede employer policies

Legal and regulatory requirements always take precedence over employer policies, and practitioners have a professional obligation to comply with applicable laws.

Question 24: A SACH (Solid Ankle Cushion Heel) foot achieves its shock absorption and pseudo-plantarflexion through which mechanism?

Compression of a foam or rubber heel wedge (Correct answer)
A carbon fiber keel that deflects under load
A mechanical hinge at the ankle joint
A hydraulic cylinder within the ankle block

Correct answer: Compression of a foam or rubber heel wedge

The SACH foot has no mechanical joint; instead, a compressible foam or rubber heel cushion simulates plantarflexion at heel strike.

Question 25: Which HCPCS code category is used for most lower-limb prosthetic devices billed to Medicare?

L codes (Correct answer)
A codes
K codes
E codes

Correct answer: L codes

L codes (L5000–L5999) are the HCPCS Level II codes designated for lower-limb prosthetic devices.

Question 26: During final QA of a transfemoral prosthesis, the technician observes that the hip joint axis of the prosthetic knee is set 5° internally rotated. This will MOST likely result in:

Whip during swing phase (Correct answer)
Excessive knee flexion at initial contact
Pistoning during mid-swing
Lateral trunk shift during stance

Correct answer: Whip during swing phase

Internal rotation misalignment of the knee axis causes a medial or lateral whip (medial whip in this case) as the foot deviates during swing phase.

Question 27: What is the correct sequence of steps when fabricating a thermoplastic transfemoral socket using direct forming?

Add suspension → heat plastic → drape over cast → trim
Drape over cast → heat plastic → trim → add suspension
Trim → heat plastic → drape over cast → add suspension
Heat plastic → drape over cast → trim → add suspension (Correct answer)

Correct answer: Heat plastic → drape over cast → trim → add suspension

The direct forming process begins with heating the thermoplastic sheet, draping it over the positive model, trimming after cooling, then adding suspension components.

Question 28: What type of personal protective equipment is mandatory when operating a lathe for prosthetic socket fabrication?

Safety glasses and no loose clothing or gloves (Correct answer)
Hearing protection and leather gloves
Face shield and cut-resistant gloves
Dust mask and chemical-resistant apron

Correct answer: Safety glasses and no loose clothing or gloves

Safety glasses are required, but gloves are prohibited on a lathe because they can catch rotating parts and pull the hand in.

Question 29: Which vacuum level range is recommended during diagnostic socket lamination to ensure adequate resin infusion without voids?

5–10 inHg
15–20 inHg
25–29 inHg (Correct answer)
30–35 inHg

Correct answer: 25–29 inHg

A vacuum level of 25–29 inHg (near atmospheric) ensures thorough resin wet-out and void-free lamination in prosthetic socket fabrication.

ABC Certified Prosthetic Technician (CTP)

The ABC Certified Prosthetic Technician (CTP) exam evaluates knowledge of prosthetic fabrication techniques, anatomy, biomechanics, materials, componentry, and professional practice standards required to assist certified prosthetists in clinical and technical settings.

Questions

35 min

Time Limit

70%

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These practice questions were written with AI tools. They are not real exam questions. Exam facts are checked against the official sources listed below. Not reviewed by a subject-matter expert. Editorial policy

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