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Free CSMLS Medical Laboratory Assistant Certification Examination Practice Questions

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Sample Practice Questions

Try these 10 sample questions from the CSMLS Medical Laboratory Assistant Certification Examination practice bank. Each includes the answer and explanation. Continue with the interactive practice above to review the full question set.

  1. 1An MLA finishes collecting blood from one patient and prepares to collect from another. Which glove practice maintains routine infection precautions?

    1. A.Use a fresh pair for the next collection.Correct answer: A
    2. B.Use the same pair after an alcohol wipe.
    3. C.Use the same pair after a soap wash.
    4. D.Use a second pair over the original pair.

    Explanation: The source states, "DO use one pair of non-sterile gloves per procedure or patient" A fresh pair is required for the new patient; washing, wiping or covering the used pair does not replace changing it.

    Reference: WHO Guidelines on Drawing Blood — Section 2.2.3, Table 2.2, printed page 12

  2. 2An MLA reviews a low red-cell oxygen-carrying capacity. Which blood protein directly carries oxygen within red blood cells?

    1. A.HemoglobinCorrect answer: A
    2. B.Albumin
    3. C.Fibrinogen
    4. D.Immunoglobulin

    Explanation: The source states, "Hemoglobin is an iron-rich protein in red blood cells that carries oxygen." Hemoglobin is the red-cell oxygen carrier. Albumin, fibrinogen and immunoglobulins are genuine blood proteins with different principal functions.

    Reference: NHLBI Anemia — Diagnosis — Complete blood count

  3. 3An MLA loads a centrifuge with a specimen and an opposing balance tube. The two liquids have different densities. Which property must match to balance this pair?

    1. A.Mass of the empty tube alone
    2. B.Total mass of each loaded tubeCorrect answer: B
    3. C.Volume of liquid in each tube
    4. D.Density of liquid in each tube

    Explanation: The source states, "you must balance the tubes by mass or weight, not volume." Match total loaded mass, including container and contents. Equal empty-tube mass, equal liquid volume or equal density alone does not ensure balanced loaded tubes.

    Reference: Queen's University Laboratory Centrifuges — Safety and Operation — General centrifuge operation — balancing

  4. 4CDC's working Giemsa buffer uses 10 mL of 100× stock plus 990 mL of deionized water. An MLA needs 250 mL of working buffer at the same strength. Which mixture is correct?

    1. A.25.0 mL stock + 225.0 mL water
    2. B.2.5 mL stock + 250.0 mL water
    3. C.2.5 mL stock + 247.5 mL waterCorrect answer: C
    4. D.0.25 mL stock + 249.75 mL water

    Explanation: The source states, "Stock Giemsa Buffer 10.0 ml Deionized water 990.0 ml" Stock makes up 10/1,000 = 0.01 of the final volume. For 250 mL, stock = 250 × 0.01 = 2.5 mL; water = 250 − 2.5 = 247.5 mL. No rounding is required. Using 25.0 mL stock is a tenfold stock-volume error. Adding 250.0 mL water to 2.5 mL stock mistakes final volume for diluent volume and gives 252.5 mL total. Using 0.25 mL stock is a tenfold underdose, completed to 250 mL with 249.75 mL water.

    Reference: CDC DPDx Blood Specimens — Staining — Working Giemsa Buffer

  5. 5After explaining specimen collection, an MLA asks the patient to describe the steps in their own words. Which communication technique is being used?

    1. A.Call-out
    2. B.Teach-backCorrect answer: B
    3. C.Check-back
    4. D.Handoff

    Explanation: The source states, "Encourage your patients to use their own words, rather than copying you or others on your clinical team." Teach-back checks patient understanding in the patient's own language. Call-outs, check-backs and handoffs serve other team communication functions.

    Reference: AHRQ The SHARE Approach — Using the Teach-Back Technique — How to use the teach-back technique

  6. 6A laboratory reviews ordering, receipt and storage of reagents so supplies are available when needed. Which quality-system essential primarily covers this activity?

    1. A.Purchasing and inventoryCorrect answer: A
    2. B.Occurrence management
    3. C.Information management
    4. D.Customer service

    Explanation: The source states, "proper management of purchasing and inventory can produce cost savings in addition to ensuring supplies and reagents are available when needed." This activity concerns reagent and supply availability and integrity. Error events, information flow and customer needs are covered by other essentials.

    Reference: WHO Laboratory Quality Management System Handbook — Section 1-3, Purchasing and inventory, printed page 14

  7. 7A capable Ontario patient expressly withdraws consent to a proposed disclosure of laboratory information. No PHIPA provision permits this disclosure without consent. What should the MLA do?

    1. A.Rely on the patient's earlier general treatment consent.
    2. B.Rely on the recipient's status as a health professional.
    3. C.Rely on the referring physician's request for the disclosure.
    4. D.Withhold the disclosure under the patient's withdrawal.Correct answer: D

    Explanation: The source states, "If consent is withheld or not given, then the custodian cannot collect, use or disclose your personal health information unless PHIPA otherwise allows the practice without consent." Express withdrawal removes the assumed consent basis here. Earlier consent, professional status and a request do not override it; the stem excludes statutory authority to disclose without consent.

    Reference: Information and Privacy Commissioner of Ontario — Consent and Your Personal Health Information — Withholding or refusing consent

  8. 8A new LIS responds normally, but staff unfamiliar with its required fields take longer to enter requests and correct mistakes. Which implementation factor best explains this initial slowdown?

    1. A.Incorrect data-field mapping
    2. B.Incorrect mandatory-field configuration
    3. C.Staff adaptation to the new systemCorrect answer: C
    4. D.Insufficient network transmission capacity

    Explanation: The source states, "Personnel accustomed to manual systems may be challenged by such tasks as correcting errors" The scenario attributes delays to unfamiliarity with the new workflow while the system functions normally. Field-mapping faults, configuration faults and insufficient network capacity are genuine implementation problems, but they do not explain this specified learning-related delay.

    Reference: WHO Laboratory Quality Management System Handbook — Section 17-4, Disadvantages, printed page 205

  9. 9An MLA wearing contact lenses opens patient specimen tubes at a bench where droplets may project toward the face. Which additional protection directly addresses the exposed eyes?

    1. A.A fluid-resistant surgical mask
    2. B.A pair of protective gogglesCorrect answer: B
    3. C.A pair of disposable sleeves
    4. D.A fluid-resistant laboratory gown

    Explanation: The source states, "Contact lenses do not offer protection from splashes.Additional eye protection must be worn with contact lenses." Goggles protect the eyes. Masks, sleeves and gowns protect other sites and do not supply the eye barrier required here.

    Reference: WHO Laboratory Quality Management System Handbook — Printed page 31, Face protection

  10. 10While reviewing renal specimen terminology, an MLA identifies the structure where blood is initially filtered within a nephron. Which structure is this?

    1. A.Ureter
    2. B.GlomerulusCorrect answer: B
    3. C.Collecting duct
    4. D.Renal pelvis

    Explanation: The source states, "The thin walls of the glomerulus allow smaller molecules, wastes, and fluid—mostly water—to pass into the tubule." Glomerular filtration starts the nephron's processing. The other named urinary structures collect or convey fluid after initial filtration.

    Reference: NIDDK Your Kidneys & How They Work — The glomerulus filters your blood

Exam Review

About CSMLS Medical Laboratory Assistant Certification Examination

CSMLS Medical Laboratory Assistant Certification Examination · CA

Key exam facts

Provider
Canadian Society for Medical Laboratory Science (CSMLS) is the pan-Canadian MLA certifying and examination body. Prometric supplies in-person and remote proctored delivery; it is not the certifying body.
Format
Computer-based multiple-choice examination, with one best answer and one mark per correct answer; images may be included. In-person testing at Prometric centres or remote proctored testing is available, subject to eligibility restrictions; non-Canadian residents must use in-person testing.
Exam questions
Total questions: 115.
Time limit
103 minutes for exam content. Appendix 2 describes 2 hours total, including a 10-minute introduction; do not treat the full appointment as answering time. Any approved testing accommodation changes the applicable timing. In-person restroom breaks do not stop the exam timer.
Passing score
A percentage cut score is established separately for each examination form using the Double Modified Angoff process. It varies with examination difficulty; there is no single universal fixed passing percentage.
Exam fee
The currently published schedule is explicitly for 2027, in Canadian dollars: Canadian residents CAD 240 (member) or 440 (non-member); non-residents CAD 320 or 595 respectively. Published late-registration totals are CAD 380/585 and 460/740 respectively. Fees may change without notice. These are 2027 charges, not a verified historical October 2026 tariff; membership and other service fees are separate.

Topics covered

The authority publishes percentage ranges for each content area. The practice percentages below use the midpoint of each range, normalized to 100%; they are not exact percentages published by the authority. Practice question counts may differ slightly because of rounding.

  • Safe Work Practices — Official range: 10–15% (Practice allocation: 11.74%)

    • Applies the principles of routine practices
    • Uses personal protective equipment, e.g. gloves, gowns, mask, face shields, aprons
    • Applies laboratory hygiene and infection control practices
    • Minimizes possible dangers from biological specimens, laboratory supplies and equipment
    • Uses laboratory safety devices, e.g. biological safety cabinet, fume hood, laminar flow cabinet, safety pipetting device, safety container and carrier, safety shower, eye wash station
    • Labels, dates, handles, stores and disposes chemicals, dyes, reagents and solutions according to legislation, e.g. WHMIS
    • Handles and disposes sharps
    • Stores, handles, transports and disposes biological and other hazardous materials according to legislation
    • Uses disinfection and sterilization methods
    • Minimizes potential hazards related to disinfection/sterilization methods
    • Applies measures in response to laboratory accidents/incidents
    • Applies spill containment and clean up procedures for biological and other hazardous materials
    • Responds appropriately to workplace emergencies
    • Reports and documents all incidents related to safety and personal injury
    • Applies proper ergonomic principles to minimize risk of injury (new)

  • Data and Specimen Collection and Handling — Official range: 45–60% (Practice allocation: 49.3%)

    • Demonstrates fundamental knowledge of medical terminology, physiology, anatomy and disease processes
    • Verifies relevant information is provided for test request
    • Provides information to the client on specimen collection, transportation and storage
    • Confirms the identity of the patient and performs venipuncture and capillary blood collection to obtain appropriate samples for laboratory analysis
    • Performs sample collection and chain of custody procedures relating to specimens with legal implications
    • Adheres to established protocols for labeling and traceability of specimens
    • Delivers specimens taking into account priority and stability
    • Assesses specimen suitability for testing
    • Verifies that the pertinent data on the specimen and requisition correspond
    • Accessions specimens into laboratory information systems
    • Adheres to guidelines for specimen retention, storage, transportation and disposal
    • Prepares specimens for analysis
    • Identifies, documents and initiates corrective action for pre-examination (pre-analytical) errors
    • Prepares documentation, packages specimens for shipping, seals and labels shipping containers in accordance with Transportation of Dangerous Goods (TDG) regulations
    • Describes the role of the laboratory in point-of-care testing (new)
    • Performs point-of-care techniques, identifies sources of interference and initiates corrective action as delegated (new)

  • Pre-analytical Procedures — Official range: 15–20% (Practice allocation: 16.43%)

    • Loads specimens for analysis on laboratory equipment
    • Prepares smears manually or using automated equipment
    • Performs routine staining and cover slipping either manually or using automated equipment, e.g. Jenner-Giemsa, Gram, Wright, Hematoxylin and Eosin, Papanicolaou, Leishman
    • Selects appropriate culture media, inoculates and incubates specimens using aseptic technique

  • Reagent Preparation — Official range: 2–4% (Practice allocation: 2.82%)

    • Prepares/stores reagents, solutions, stains or media to specifications Performs calculations/dilutions for reagent preparation
    • Uses reagent preparation equipment, e.g. pH meter, balance, autoclave
    • Cleans glassware according to specifications

  • Communication and Interaction — Official range: 2–4% (Practice allocation: 2.82%)

    • Practises effective communication with colleagues, patients/clients and other health care professionals: • Active listening • Verbal communication Non-verbal communication Written communication Conflict management Identifies barriers to effective communication Uses technology appropriately to facilitate communication
    • Demonstrates effective teamwork skills
    • Demonstrates interdisciplinary/interprofessional team skills: • Communication • Collaboration • Role clarification • Reflection
    • Demonstrates adaptive skills when interacting with patients/clients

  • Quality Management — Official range: 2–4% (Practice allocation: 2.82%)

    • Demonstrates knowledge of quality systems essentials (QSE)
    • Follows established protocols as defined in policy, process and procedure manuals
    • Prepares and runs quality controls/standards on equipment, to be validated by a medical laboratory technologist (new)
    • Assists in updating procedures and protocols, as well as other reference information and communication
    • Participates in workflow analysis to identify issues and solve problems
    • Identifies, documents and reports deficiencies that may affect the quality of testing (new)
    • Performs and documents preventative maintenance and reagent changes, according to established protocols
    • Recognizes malfunctions in equipment/instruments, initiates and documents corrective action
    • Participates in continuous quality improvement activities (new)
    • Demonstrates knowledge of risk management (new)
    • Participates in internal and external quality assurance activities, e.g. proficiency testing, audits, accreditation (new)
    • Demonstrates knowledge of inventory maintenance
    • Demonstrates information management skills, e.g. computer, laboratory information systems and related technology

  • Professional Practice — Official range: 5–10% (Practice allocation: 7.04%)

    • Maintains confidentiality of health care information
    • Complies with legislations that govern the medical laboratory profession
    • Recognizes limitations of own competence and seeks action to resolve
    • Obtains informed consent prior to procedure and respects a patient’s right to refuse
    • Recognizes potentially dangerous situations and understands the right to refuse unsafe work
    • Takes responsibility and is accountable for professional actions
    • Recognizes the need for and participates in continuing education and training
    • Promotes the image and status of the profession of medical laboratory science as members of the health care team
    • Recognizes how ethical issues in the health care environment affect the medical laboratory assistant and clients
    • Demonstrates knowledge of the health care system, professional laboratory organizations and their responsibilities
    • Demonstrates knowledge of the determinants of health and their implications for the laboratory system (new)
    • Respects the diversity, dignity, values, and beliefs of patients/clients and colleagues
    • Demonstrates knowledge of interpersonal skills: • Recognizes signs of individual and group stress • Recognizes signs of patient stress • Exhibits empathy when assisting patients and colleagues

  • Critical Thinking — Official range: 5–10% (Practice allocation: 7.04%)

    • Demonstrates knowledge of a dynamic environment; adapts and responds to change
    • Recognizes that change initiated in one area may impact other areas of health care services
    • Engages in reflective practice; stops and thinks about practice, consciously analyzes decision making and draws conclusions to improve future practice (new)
    • Organizes work to accommodate priorities
    • Maximizes efficient use of resources, e.g. time, equipment, personnel
    • Demonstrates effective problem solving/trouble-shooting strategies and initiates appropriate follow up (new)
    • Contributes to implementation strategies that integrate timelines, resource management and communication related to projects or research/studies (new)
    • Demonstrates the ability to make evidence-based decisions (new)

How to prepare

Work through the topics, read the explanation after each answer, and revisit the areas where you miss questions. Use the official outline and reference materials below to guide your study.

These independent practice questions are not actual exam items and do not guarantee a passing result.

Frequently asked questions

What is the exam format?

Computer-based multiple-choice examination, with one best answer and one mark per correct answer; images may be included. In-person testing at Prometric centres or remote proctored testing is available, subject to eligibility restrictions; non-Canadian residents must use in-person testing.

How many questions are on the exam?

Total questions: 115.

How long is the exam?

103 minutes for exam content. Appendix 2 describes 2 hours total, including a 10-minute introduction; do not treat the full appointment as answering time. Any approved testing accommodation changes the applicable timing. In-person restroom breaks do not stop the exam timer.

What is the passing score?

A percentage cut score is established separately for each examination form using the Double Modified Angoff process. It varies with examination difficulty; there is no single universal fixed passing percentage.

How much does the exam cost?

The currently published schedule is explicitly for 2027, in Canadian dollars: Canadian residents CAD 240 (member) or 440 (non-member); non-residents CAD 320 or 595 respectively. Published late-registration totals are CAD 380/585 and 460/740 respectively. Fees may change without notice. These are 2027 charges, not a verified historical October 2026 tariff; membership and other service fees are separate.

Official sources and references

Confirm current exam arrangements with the exam provider.