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DC HEALTH | BOARD OF CLINICAL LABORATORY SCIENCE
Histotechnologist | Professional Licensure
DC — Histotechnologist Licensure Exam
District of Columbia Histotechnologist Licensure Examination
INSTITUTION DC Health | Board of Clinical Laboratory Science
PROGRAM Histotechnologist Licensure
EXAM TITLE DC HISTOTECHNOLOGIST EXAM 2026/2027 | Verified Questions
COURSE TITLE District of Columbia Histotechnologist Licensure Examination
COURSE CODE DC-HTL
ACADEMIC YEAR 2026/2027
TOTAL QUESTIONS 150 Questions
Core Domains: Fixation • Processing • Embedding and Microtomy • Staining • Laboratory Operations
Current Histotechnologist Professional Focus
Multiple-Choice • Scenario Analysis • Applied Histotechnology Reasoning Format
2026/2027 Edition — Aligned with the DC Health Board of Clinical Laboratory Science Histotechnologist Licensure Examination, ASCP Board of
Certification content guidelines, CLIA, CAP, and OSHA standards
CONTENTS
Domain Content Area Questions
Domain 1 Fixation 30
Domain 2 Processing 24
Domain 3 Embedding and Microtomy 30
Domain 4 Staining 48
Domain 5 Laboratory Operations 18
TOTAL All Domains 150
© BestSellerStuvia
Academic Year 2026/2027
DC-HTL | 2026/2027
ACTUAL QUESTIONS
Domain 1: Fixation
Question 1. What is the most commonly used routine fixative in histopathology laboratories?
A. 10% neutral buffered formalin
B. Bouin's solution
C. Zenker's fluid
D. Carnoy's fluid
Correct Answer: A
Rationale: 10% neutral buffered formalin is the standard routine fixative because it preserves morphology well and is compatible
with most downstream techniques.
Question 2. What is the minimum recommended fixative-to-tissue volume ratio?
© BestSellerStuvia | | DC-HTL | Academic Year 2026/2027
, © BestSellerStuvia |
A. 2:1
B. 5:1
C. 10:1
D. 20:1
Correct Answer: C
Rationale: A ratio of at least 10:1 ensures adequate fixation by providing sufficient fixative molecules relative to tissue mass.
Question 3. What tissue thickness is recommended for routine fixation to ensure complete penetration?
A. 3–5 mm
B. 1–2 mm
C. 8–10 mm
D. 15–20 mm
Correct Answer: A
Rationale: Slices 3–5 mm thick allow formalin to penetrate fully within a practical time frame while preserving architecture.
Question 4. Why is neutral buffered formalin preferred over unbuffered formalin?
A. It is less expensive
B. Neutral pH prevents formalin pigment formation and better preserves morphology
C. It acts faster
D. It requires no disposal precautions
Correct Answer: B
Rationale: Acidic formalin forms black formalin pigment; buffering to neutral pH avoids this artifact.
Question 5. What is the primary mechanism of formalin fixation?
A. Coagulation of proteins by alcohol
B. Precipitation of nucleic acids
C. Cross-linking of proteins via methylene bridges
D. Extraction of lipids
Correct Answer: C
Rationale: Formaldehyde forms methylene bridges between protein amino groups, stabilizing tissue structure.
Question 6. Which fixative is preferred when subsequent molecular studies (e.g., PCR) are planned?
A. Bouin's solution
B. Zenker's fluid
C. Mercuric chloride fixatives
D. Ethanol-based or other alcohol fixatives
Correct Answer: D
Rationale: Alcohol-based fixatives preserve nucleic acids better; picric acid in Bouin's and heavy metals can inhibit molecular assays.
Question 7. What is a major disadvantage of Bouin's solution for molecular testing?
A. Picric acid cross-links nucleic acids and can inhibit PCR
B. It is too expensive
C. It does not fix lipids
D. It requires refrigeration
Correct Answer: A
Rationale: Picric acid damages DNA/RNA, making Bouin's unsuitable when molecular studies are anticipated.
Question 8. Which fixative is traditionally used for testicular biopsies to preserve nuclear detail?
A. 10% NBF
B. Bouin's solution
C. Zenker's fluid
D. Carnoy's fluid
Correct Answer: B
Rationale: Bouin's provides excellent nuclear detail and is historically preferred for testis.
Question 9. What is the recommended fixation time for most routine surgical specimens in 10% NBF?
A. 30 minutes
B. 1 week minimum
C. 6–48 hours depending on size
© BestSellerStuvia | | DC-HTL | Academic Year 2026/2027
, © BestSellerStuvia |
D. Only until the tissue floats
Correct Answer: C
Rationale: Adequate fixation typically requires several hours to overnight; larger specimens may need longer.
Question 10. What artifact is associated with incomplete fixation before processing?
A. Formalin pigment
B. Mercury pigment
C. Chrome pigment
D. Nuclear bubbling or smudging and poor staining quality
Correct Answer: D
Rationale: Under-fixed tissue yields soft, poorly staining sections with nuclear artifacts.
Question 11. Which fixative contains mercuric chloride and is used for hematopoietic tissues?
A. Zenker's or B-5
B. Bouin's
C. Carnoy's
D. 10% NBF
Correct Answer: A
Rationale: Zenker's and B-5 contain mercury and provide excellent nuclear detail for lymph nodes and bone marrow.
Question 12. What is the primary purpose of fixation?
A. To harden tissue for easier cutting only
B. To preserve morphology, prevent autolysis and putrefaction, and prepare tissue for subsequent processing and staining
C. To extract all lipids
D. To make tissue transparent
Correct Answer: B
Rationale: Fixation stabilizes proteins, stops enzymatic degradation, and renders tissue suitable for processing.
Question 13. What is formalin pigment and how is it removed?
A. A yellow pigment from Bouin's; removed by water
B. A chrome pigment; removed by iodine
C. A black precipitate formed in acidic formalin; removed by alcoholic picric acid or alkaline alcohol
D. It cannot be removed
Correct Answer: C
Rationale: Formalin pigment forms when formalin is acidic; it is removed by treatment with alcoholic picric acid or dilute alkali.
Question 14. Which fixative is recommended for preserving glycogen?
A. Aqueous formalin
B. Zenker's fluid
C. Mercuric chloride alone
D. Alcoholic fixatives such as Carnoy's
Correct Answer: D
Rationale: Glycogen is water-soluble; alcohol-based fixatives precipitate and preserve it better.
Question 15. What is the effect of over-fixation in formalin on immunohistochemistry?
A. Excessive cross-linking can mask epitopes and reduce antigen retrieval success
B. It always improves antigenicity
C. It has no effect on IHC
D. It only affects nuclear antigens
Correct Answer: A
Rationale: Over-fixation increases cross-links that can hinder antibody binding; antigen retrieval mitigates but does not always
reverse this.
Question 16. What is the recommended fixative for urgent frozen-section diagnosis when permanent
sections will also be needed?
A. Immediate freezing without fixation
B. Brief formalin fixation followed by freezing is generally avoided; unfixed tissue is preferred for frozen section
C. Bouin's for 24 hours
D. Zenker's for 1 hour
© BestSellerStuvia | | DC-HTL | Academic Year 2026/2027
DC HEALTH | BOARD OF CLINICAL LABORATORY SCIENCE
Histotechnologist | Professional Licensure
DC — Histotechnologist Licensure Exam
District of Columbia Histotechnologist Licensure Examination
INSTITUTION DC Health | Board of Clinical Laboratory Science
PROGRAM Histotechnologist Licensure
EXAM TITLE DC HISTOTECHNOLOGIST EXAM 2026/2027 | Verified Questions
COURSE TITLE District of Columbia Histotechnologist Licensure Examination
COURSE CODE DC-HTL
ACADEMIC YEAR 2026/2027
TOTAL QUESTIONS 150 Questions
Core Domains: Fixation • Processing • Embedding and Microtomy • Staining • Laboratory Operations
Current Histotechnologist Professional Focus
Multiple-Choice • Scenario Analysis • Applied Histotechnology Reasoning Format
2026/2027 Edition — Aligned with the DC Health Board of Clinical Laboratory Science Histotechnologist Licensure Examination, ASCP Board of
Certification content guidelines, CLIA, CAP, and OSHA standards
CONTENTS
Domain Content Area Questions
Domain 1 Fixation 30
Domain 2 Processing 24
Domain 3 Embedding and Microtomy 30
Domain 4 Staining 48
Domain 5 Laboratory Operations 18
TOTAL All Domains 150
© BestSellerStuvia
Academic Year 2026/2027
DC-HTL | 2026/2027
ACTUAL QUESTIONS
Domain 1: Fixation
Question 1. What is the most commonly used routine fixative in histopathology laboratories?
A. 10% neutral buffered formalin
B. Bouin's solution
C. Zenker's fluid
D. Carnoy's fluid
Correct Answer: A
Rationale: 10% neutral buffered formalin is the standard routine fixative because it preserves morphology well and is compatible
with most downstream techniques.
Question 2. What is the minimum recommended fixative-to-tissue volume ratio?
© BestSellerStuvia | | DC-HTL | Academic Year 2026/2027
, © BestSellerStuvia |
A. 2:1
B. 5:1
C. 10:1
D. 20:1
Correct Answer: C
Rationale: A ratio of at least 10:1 ensures adequate fixation by providing sufficient fixative molecules relative to tissue mass.
Question 3. What tissue thickness is recommended for routine fixation to ensure complete penetration?
A. 3–5 mm
B. 1–2 mm
C. 8–10 mm
D. 15–20 mm
Correct Answer: A
Rationale: Slices 3–5 mm thick allow formalin to penetrate fully within a practical time frame while preserving architecture.
Question 4. Why is neutral buffered formalin preferred over unbuffered formalin?
A. It is less expensive
B. Neutral pH prevents formalin pigment formation and better preserves morphology
C. It acts faster
D. It requires no disposal precautions
Correct Answer: B
Rationale: Acidic formalin forms black formalin pigment; buffering to neutral pH avoids this artifact.
Question 5. What is the primary mechanism of formalin fixation?
A. Coagulation of proteins by alcohol
B. Precipitation of nucleic acids
C. Cross-linking of proteins via methylene bridges
D. Extraction of lipids
Correct Answer: C
Rationale: Formaldehyde forms methylene bridges between protein amino groups, stabilizing tissue structure.
Question 6. Which fixative is preferred when subsequent molecular studies (e.g., PCR) are planned?
A. Bouin's solution
B. Zenker's fluid
C. Mercuric chloride fixatives
D. Ethanol-based or other alcohol fixatives
Correct Answer: D
Rationale: Alcohol-based fixatives preserve nucleic acids better; picric acid in Bouin's and heavy metals can inhibit molecular assays.
Question 7. What is a major disadvantage of Bouin's solution for molecular testing?
A. Picric acid cross-links nucleic acids and can inhibit PCR
B. It is too expensive
C. It does not fix lipids
D. It requires refrigeration
Correct Answer: A
Rationale: Picric acid damages DNA/RNA, making Bouin's unsuitable when molecular studies are anticipated.
Question 8. Which fixative is traditionally used for testicular biopsies to preserve nuclear detail?
A. 10% NBF
B. Bouin's solution
C. Zenker's fluid
D. Carnoy's fluid
Correct Answer: B
Rationale: Bouin's provides excellent nuclear detail and is historically preferred for testis.
Question 9. What is the recommended fixation time for most routine surgical specimens in 10% NBF?
A. 30 minutes
B. 1 week minimum
C. 6–48 hours depending on size
© BestSellerStuvia | | DC-HTL | Academic Year 2026/2027
, © BestSellerStuvia |
D. Only until the tissue floats
Correct Answer: C
Rationale: Adequate fixation typically requires several hours to overnight; larger specimens may need longer.
Question 10. What artifact is associated with incomplete fixation before processing?
A. Formalin pigment
B. Mercury pigment
C. Chrome pigment
D. Nuclear bubbling or smudging and poor staining quality
Correct Answer: D
Rationale: Under-fixed tissue yields soft, poorly staining sections with nuclear artifacts.
Question 11. Which fixative contains mercuric chloride and is used for hematopoietic tissues?
A. Zenker's or B-5
B. Bouin's
C. Carnoy's
D. 10% NBF
Correct Answer: A
Rationale: Zenker's and B-5 contain mercury and provide excellent nuclear detail for lymph nodes and bone marrow.
Question 12. What is the primary purpose of fixation?
A. To harden tissue for easier cutting only
B. To preserve morphology, prevent autolysis and putrefaction, and prepare tissue for subsequent processing and staining
C. To extract all lipids
D. To make tissue transparent
Correct Answer: B
Rationale: Fixation stabilizes proteins, stops enzymatic degradation, and renders tissue suitable for processing.
Question 13. What is formalin pigment and how is it removed?
A. A yellow pigment from Bouin's; removed by water
B. A chrome pigment; removed by iodine
C. A black precipitate formed in acidic formalin; removed by alcoholic picric acid or alkaline alcohol
D. It cannot be removed
Correct Answer: C
Rationale: Formalin pigment forms when formalin is acidic; it is removed by treatment with alcoholic picric acid or dilute alkali.
Question 14. Which fixative is recommended for preserving glycogen?
A. Aqueous formalin
B. Zenker's fluid
C. Mercuric chloride alone
D. Alcoholic fixatives such as Carnoy's
Correct Answer: D
Rationale: Glycogen is water-soluble; alcohol-based fixatives precipitate and preserve it better.
Question 15. What is the effect of over-fixation in formalin on immunohistochemistry?
A. Excessive cross-linking can mask epitopes and reduce antigen retrieval success
B. It always improves antigenicity
C. It has no effect on IHC
D. It only affects nuclear antigens
Correct Answer: A
Rationale: Over-fixation increases cross-links that can hinder antibody binding; antigen retrieval mitigates but does not always
reverse this.
Question 16. What is the recommended fixative for urgent frozen-section diagnosis when permanent
sections will also be needed?
A. Immediate freezing without fixation
B. Brief formalin fixation followed by freezing is generally avoided; unfixed tissue is preferred for frozen section
C. Bouin's for 24 hours
D. Zenker's for 1 hour
© BestSellerStuvia | | DC-HTL | Academic Year 2026/2027
