MLPAO Study Guide 2026
Everything you need to pass the MLPAO exam in one place: the exam format, every topic to study, real practice questions with explanations, flashcards, and full-length practice tests. Free, no sign-up needed.
📋 MLPAO Exam Format at a Glance
📚 MLPAO Topics to Study (87)
✍️ Sample MLPAO Questions & Answers
1. Which liver enzyme is most specific for biliary obstruction?
5'-Nucleotidase is the most specific enzyme for biliary obstruction because it is primarily found in hepatobiliary tissue. While alkaline phosphatase and GGT are also elevated in cholestasis, they can be elevated in bone disease and other conditions respectively.
2. What is the clinical significance of a low glucose level in pleural or peritoneal fluid?
Low glucose in body fluids indicates consumption by bacteria (empyema, SBP), high metabolic activity of inflammatory cells (rheumatoid pleurisy, TB), or utilization by malignant cells. In pleural fluid, glucose <3.3 mmol/L is associated with complicated parapneumonic effusion requiring drainage. In ascitic fluid, low glucose suggests secondary bacterial peritonitis.
3. A specimen for bilirubin testing arrives in the laboratory in a clear transport bag. The test is scheduled to be performed 2 hours after collection. What is the most likely issue with this specimen?
Bilirubin is a light-sensitive analyte. Exposure to light, especially ultraviolet light, causes it to break down, leading to falsely low test results. Specimens for bilirubin testing must be protected from light by using an amber-colored tube or by wrapping the tube in aluminum foil or other light-blocking material.
4. What is a type and screen versus a type and crossmatch?
A type and screen (group and screen) includes ABO/Rh typing and antibody screening. If a negative screen and no history of clinically significant antibodies exist, blood can be issued with an electronic (computer) crossmatch. A type and crossmatch includes the additional step of testing patient serum against a specific donor unit, required when clinically significant antibodies are present.
5. What action should be taken if a hematoma begins to form during venipuncture?
Hematoma formation indicates blood is entering the tissue rather than the collection tube. The tourniquet must be released and needle withdrawn immediately, followed by firm pressure to prevent further extravasation.
6. In clinical chemistry, what is a 'blank' in the context of spectrophotometric analysis?
A blank (or reagent blank) contains all assay reagents but no analyte. It is used to zero the spectrophotometer, accounting for background absorbance from reagents and the cuvette.