ASCP BOC Medical Laboratory Assistant (MLA) Examination Practice Test
Medical laboratory assistant work supports accurate testing through careful patient preparation, specimen collection, labeling, handling, and transport. MLA practice questions address practical decisions such as filling anticoagulant tubes correctly, protecting light-sensitive samples, preparing clean-catch urine collections, and responding to identification or privacy concerns.
Exam overview
About the ASCP BOC Medical Laboratory Assistant (MLA) Examination Exam
Reliable preanalytical work begins with confirming patient identity and matching labels to the specimen at collection. Assistants must understand how collection conditions affect sample integrity, including anticoagulant-to-blood ratios, clot formation in samples intended to yield plasma, and contamination risks during urine collection. They also need to follow test-specific instructions for fasting, container selection, light protection, and timely transport. Safe practice includes using appropriate precautions for potentially infectious material, recognizing collection restrictions such as an arteriovenous fistula, and escalating situations that require another collection method or qualified staff. Confidentiality is part of routine workflow: printed records and other protected health information must not be left exposed in public areas. These decisions help prevent rejected specimens, unreliable results, patient harm, and avoidable testing delays.
Sample Practice Questions
Review a selection from this exam's published US Practice Tests practice bank.
A lavender-top blood collection tube is filled only halfway. Why can this affect test quality?
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Correct answer: AAdditive tubes are designed for a specified fill volume. Underfilling can leave too much anticoagulant relative to blood and may compromise results, particularly for coagulation or cellular testing.
A laboratory assistant is preparing a urine specimen for routine transport. Which container practice is appropriate?
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Correct answer: AA clean, leak-resistant container with a secure closure helps preserve specimen integrity and prevent spills. Specimens should remain in their designated containers and be handled according to laboratory procedures.
A specimen is collected for a test that requires protection from light. Which handling step is appropriate?
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Correct answer: DSome analytes can be affected by light exposure. Use the laboratory's specified light-protection method, preserve required labeling, and transport the specimen within the required timeframe.
A patient's health information is visible on a printed worksheet left unattended in a public hallway. What is the best response?
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Correct answer: AProtect confidential health information from unauthorized viewing. Secure the document and follow organizational privacy procedures, including notifying the appropriate staff when needed.
When preparing a clean-catch urine collection, why should the patient avoid touching the inside of the container or lid?
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Correct answer: ATouching the inside surfaces can transfer organisms or other material into the specimen and affect testing, especially culture. The container should remain clean internally during collection.
A laboratory assistant is asked to collect a blood specimen from a patient with an arteriovenous fistula used for dialysis. Which action is appropriate?
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Correct answer: BRoutine venipuncture should not be performed on an arm with a dialysis fistula. The assistant should use an appropriate alternative site and follow local procedures, seeking guidance when needed to protect the access and the patient.
A specimen arrives in a tube with a clot when the requested testing requires plasma from an anticoagulated sample. What is the main concern?
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Correct answer: AA clot in an anticoagulated specimen may indicate inadequate mixing or another collection problem. Clotting can alter cellular and analyte composition, so the specimen may not be suitable; follow laboratory acceptance criteria rather than attempting to fix it by shaking.
How to use this practice test
The free practice session presents up to 20 random questions from the 50-question MLA bank. Answer scenarios on specimen collection, handling, transport, patient identification, and confidentiality, then review the results shown after the session to identify areas for targeted practice.
Preparation tips
- For anticoagulant tubes, connect the additive to its purpose and review why underfilling can disrupt the required blood-to-additive ratio.
- Practice the sequence for positive patient identification, label verification, and specimen labeling at the collection site; know when an unreadable band requires resolution before collection.
- Compare handling requirements for routine urine, clean-catch urine, light-sensitive specimens, and potentially infectious samples, including suitable containers and transport precautions.
- Review collection-site restrictions, including why an assistant must avoid drawing from an arm with a dialysis arteriovenous fistula and seek an appropriate alternative.
- Work through scenarios involving fasting instructions, clotted anticoagulated specimens, and exposed health information; identify the immediate safe action and when to notify responsible staff.