DC Histotechnologist Exam Practice
Questions And Correct Answers
(Verified Answers) Plus Rationale 2026
Q&A| Instant Download Pdf
1. A paraffin-embedded tissue block is being prepared for routine
histological examination. Which step is most critical to ensure proper
preservation of tissue morphology prior to processing?
A Rapid freezing of the tissue without fixation
B Immediate immersion in 10% neutral buffered formalin
C Air-drying the specimen at room temperature for 24 hours
D Placing the tissue directly into xylene for clearing
Correct Answer: B
Proper fixation using 10% neutral buffered formalin stabilizes cellular
proteins and prevents autolysis and putrefaction, which is essential
for preserving tissue architecture before downstream processing
steps such as dehydration, clearing, and embedding.
2. During tissue processing, a technician notices that a specimen appears
excessively brittle after embedding. Which is the most likely cause?
A Under-dehydration in alcohol
B Overexposure to xylene or clearing agent
C Insufficient fixation time
D Improper staining with hematoxylin
Correct Answer: B
Excessive exposure to clearing agents such as xylene can harden and
, make tissue overly brittle by removing too much lipid and causing
dehydration imbalance, leading to poor microtomy quality.
3. Which of the following best describes the primary purpose of
decalcification in histotechnology?
A To enhance nuclear staining with hematoxylin
B To remove calcium deposits to allow sectioning
C To increase tissue protein cross-linking
D To improve antibody binding in immunohistochemistry
Correct Answer: B
Decalcification removes calcium salts from hard tissues like bone,
enabling them to be cut into thin sections without damaging the
microtome blade or tearing the tissue.
4. A technician is preparing a frozen section for lipid visualization. Which
stain is most appropriate?
A Masson's trichrome
B Oil Red O
C Periodic acid-Schiff (PAS)
D Hematoxylin and eosin (H&E)
Correct Answer: B
Oil Red O is a lipid-soluble dye used on frozen sections to stain
neutral fats, as routine processing would dissolve lipids during
dehydration and clearing.
5. Which fixative is most appropriate for preserving ultrastructural detail
for electron microscopy?
A 10% neutral buffered formalin
B Bouin’s solution
C Glutaraldehyde
D Alcohol-acetic acid
Correct Answer: C
Glutaraldehyde provides excellent cross-linking of proteins at the
ultrastructural level, preserving fine cellular detail required for
electron microscopy.
6. What is the main function of the embedding step in histotechnology?
A To remove water from tissue
B To replace alcohol with paraffin wax for support
, C To stain cellular components
D To dissolve lipids prior to fixation
Correct Answer: B
Embedding replaces clearing agents with paraffin wax, providing
structural support that allows thin, uniform sectioning of tissue using
a microtome.
7. Which artifact is commonly associated with improper fixation delay?
A Knife marks
B Autolysis
C Section compression
D Chatter artifact
Correct Answer: B
Autolysis occurs when enzymatic degradation begins before fixation,
leading to breakdown of cellular structures and loss of diagnostic
detail.
8. What is the primary purpose of hematoxylin in H&E staining?
A Stains cytoplasm pink
B Stains nuclei blue-purple
C Stains connective tissue green
D Stains lipids red
Correct Answer: B
Hematoxylin is a basic dye that binds to acidic nuclear components
such as DNA, producing a blue to purple nuclear stain.
9. A tissue section shows chatter (alternating thick and thin bands). What
is the most likely cause?
A Overstaining with eosin
B Dull microtome blade or hard tissue
C Excessive fixation time
D Inadequate dehydration
Correct Answer: B
Chatter is typically caused by vibration during sectioning due to a
dull blade, hard tissue, or incorrect clearance angle on the
microtome.
10. Which reagent is primarily used in the clearing step of tissue
processing?
Questions And Correct Answers
(Verified Answers) Plus Rationale 2026
Q&A| Instant Download Pdf
1. A paraffin-embedded tissue block is being prepared for routine
histological examination. Which step is most critical to ensure proper
preservation of tissue morphology prior to processing?
A Rapid freezing of the tissue without fixation
B Immediate immersion in 10% neutral buffered formalin
C Air-drying the specimen at room temperature for 24 hours
D Placing the tissue directly into xylene for clearing
Correct Answer: B
Proper fixation using 10% neutral buffered formalin stabilizes cellular
proteins and prevents autolysis and putrefaction, which is essential
for preserving tissue architecture before downstream processing
steps such as dehydration, clearing, and embedding.
2. During tissue processing, a technician notices that a specimen appears
excessively brittle after embedding. Which is the most likely cause?
A Under-dehydration in alcohol
B Overexposure to xylene or clearing agent
C Insufficient fixation time
D Improper staining with hematoxylin
Correct Answer: B
Excessive exposure to clearing agents such as xylene can harden and
, make tissue overly brittle by removing too much lipid and causing
dehydration imbalance, leading to poor microtomy quality.
3. Which of the following best describes the primary purpose of
decalcification in histotechnology?
A To enhance nuclear staining with hematoxylin
B To remove calcium deposits to allow sectioning
C To increase tissue protein cross-linking
D To improve antibody binding in immunohistochemistry
Correct Answer: B
Decalcification removes calcium salts from hard tissues like bone,
enabling them to be cut into thin sections without damaging the
microtome blade or tearing the tissue.
4. A technician is preparing a frozen section for lipid visualization. Which
stain is most appropriate?
A Masson's trichrome
B Oil Red O
C Periodic acid-Schiff (PAS)
D Hematoxylin and eosin (H&E)
Correct Answer: B
Oil Red O is a lipid-soluble dye used on frozen sections to stain
neutral fats, as routine processing would dissolve lipids during
dehydration and clearing.
5. Which fixative is most appropriate for preserving ultrastructural detail
for electron microscopy?
A 10% neutral buffered formalin
B Bouin’s solution
C Glutaraldehyde
D Alcohol-acetic acid
Correct Answer: C
Glutaraldehyde provides excellent cross-linking of proteins at the
ultrastructural level, preserving fine cellular detail required for
electron microscopy.
6. What is the main function of the embedding step in histotechnology?
A To remove water from tissue
B To replace alcohol with paraffin wax for support
, C To stain cellular components
D To dissolve lipids prior to fixation
Correct Answer: B
Embedding replaces clearing agents with paraffin wax, providing
structural support that allows thin, uniform sectioning of tissue using
a microtome.
7. Which artifact is commonly associated with improper fixation delay?
A Knife marks
B Autolysis
C Section compression
D Chatter artifact
Correct Answer: B
Autolysis occurs when enzymatic degradation begins before fixation,
leading to breakdown of cellular structures and loss of diagnostic
detail.
8. What is the primary purpose of hematoxylin in H&E staining?
A Stains cytoplasm pink
B Stains nuclei blue-purple
C Stains connective tissue green
D Stains lipids red
Correct Answer: B
Hematoxylin is a basic dye that binds to acidic nuclear components
such as DNA, producing a blue to purple nuclear stain.
9. A tissue section shows chatter (alternating thick and thin bands). What
is the most likely cause?
A Overstaining with eosin
B Dull microtome blade or hard tissue
C Excessive fixation time
D Inadequate dehydration
Correct Answer: B
Chatter is typically caused by vibration during sectioning due to a
dull blade, hard tissue, or incorrect clearance angle on the
microtome.
10. Which reagent is primarily used in the clearing step of tissue
processing?
