HTL Cheat Sheet 2026

The 30 highest-yield HTL facts, distilled from real exam questions. Print it, save it as a PDF, or study it here — free, no sign-up.

1. Alcian blue at pH 2.5 stains which type of mucin? → Sulfated and carboxylated acid mucins
2. Which document must a CAP-accredited laboratory have in place to describe actions taken when test results fall outside acceptable limits? → Corrective action policy
3. What is the purpose of a cryostat in histology? → To cut frozen tissue samples for rapid diagnosis
4. Endogenous biotin activity is a common source of background in IHC. Which tissue type is most problematic? → Kidney and liver
5. Which quality improvement method is most applicable to professional ethics & legal compliance in Histotechnology Certification? → Plan-Do-Check-Act (PDCA) continuous improvement cycle
6. How should a HTL professional handle a situation where communication & interprofessional collaboration protocols conflict with practical constraints? → Document the conflict and seek guidance from appropriate authorities
7. During a mock inspection, a CAP team member asks to see the laboratory's 'non-conforming event' log. What is this document intended to capture? → Instances where processes deviated from established procedures or standards
8. What is a common challenge professionals face when applying quality assurance & performance improvement principles in Histotechnology Certification? → Balancing theoretical knowledge with practical application
9. Why is pH control important in tissue fixation and staining? → To ensure proper tissue preservation and accurate staining
10. What is the role of hematoxylin and eosin (H&E) staining in histology? → It highlights the nucleus and cytoplasm
11. Which maintenance step is most important for extending the life of a tissue processor's reagent carousel seals? → Inspecting and lubricating seals according to manufacturer schedule
12. A tissue specimen shows shrinkage artifact and poor nuclear detail after processing. The most likely cause is: → Excessive dehydration time in high-concentration alcohol
13. How does continuing education relate to evidence-based practice & research methods for HTL certified professionals? → It ensures professionals stay current with evolving standards and best practices
14. A laboratory using xylene as a tissue-clearing agent must maintain its Safety Data Sheet under which GHS section covering physical and health hazards? → Section 2 – Hazard Identification
15. A laboratory balance must be leveled before use primarily to ensure: → Accurate and reproducible weight measurements
16. Paraffin sections that consistently fold or wrinkle as they come off the microtome knife are MOST likely caused by: → Block temperature that is too warm
17. How do accreditation organizations impact histology laboratory practices? → By ensuring compliance with recognized quality and safety standards
18. Which body issues the HTL(ASCP) credential and is responsible for setting its continuing education requirements? → American Society for Clinical Pathology (ASCP) Board of Certification
19. What is the significance of peer review in professional ethics & legal compliance for HTL professionals? → It promotes accountability, knowledge sharing, and quality improvement
20. What is the primary advantage of using a vacuum during paraffin infiltration on automated processors? → It removes residual clearing agent and air bubbles, improving wax penetration
21. What is the purpose of heat-induced epitope retrieval (HIER) before immunohistochemical staining? → To unmask antigens cross-linked by formalin fixation
22. In Histotechnology Certification, what role does communication & interprofessional collaboration play in ensuring client/stakeholder satisfaction? → It builds trust through demonstrated competence and consistency
23. What is the purpose of the dehydration step in tissue processing? → To remove water so the clearing agent can penetrate
24. Congo red staining of amyloid, when viewed under polarized light, produces which characteristic appearance? → Apple-green birefringence
25. In electron microscopy, which ultrastructural feature is pathognomonic for melanoma? → Premelanosomes (melanosomes at various stages)
26. What is the purpose of histopathology in medical diagnostics? → To analyze tissue for disease and abnormality detection
27. The purpose of the dichroic (dichromatic) mirror in a fluorescence microscope is to: → Reflect excitation light onto the specimen and transmit emission light to the detector
28. Which antigen retrieval method uses a microwave or pressure cooker with citrate buffer to unmask epitopes? → Heat-induced epitope retrieval (HIER)
29. What is the most commonly used marker in immunohistochemistry? → Antibodies that bind to specific antigens
30. In a positive IHC control tissue, staining is absent but the negative control (no primary antibody) is also negative. What does this indicate? → Primary antibody failure or antigen loss in control tissue