Laboratory Science Study Guide 2026
Everything you need to pass the Laboratory Science 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.
📋 Laboratory Science Exam Format at a Glance
📚 Laboratory Science Topics to Study (21)
✍️ Sample Laboratory Science Questions & Answers
1. What is the purpose of a streak plate technique in microbiology?
The streak plate technique dilutes bacteria across successive sectors, producing isolated single colonies from a mixed specimen for pure culture isolation and identification.
2. What is the Henderson-Hasselbalch equation used for in clinical chemistry?
The Henderson-Hasselbalch equation (pH = pKa + log[HCO₃⁻/0.0307×pCO₂]) describes the relationship between pH, bicarbonate, and CO₂, critical for interpreting acid-base disorders.
3. Blood cultures are typically incubated for how many days before being reported as negative?
Most clinical blood cultures are incubated for 5 days in automated systems (e.g., BACTEC), which is sufficient to detect the vast majority of clinically significant bacteremia.
4. Which lipoprotein fraction is considered 'good cholesterol' due to its cardioprotective role?
HDL transports cholesterol from peripheral tissues back to the liver for excretion (reverse cholesterol transport), and higher HDL levels are associated with reduced cardiovascular risk.
5. Which acute transfusion reaction is the most severe and potentially life-threatening?
Acute hemolytic transfusion reactions, most often caused by ABO incompatibility, trigger complement activation that can lead to DIC, renal failure, and death.
6. Which culture medium is used for isolating Neisseria gonorrhoeae from clinical specimens?
Thayer-Martin agar is a selective medium containing antibiotics (vancomycin, colistin, nystatin) that suppress normal flora while allowing N. gonorrhoeae to grow.