Page 1 of 146
HISTOTECHNOLOGIST CERTIFICATION
ACTUAL EXAM 2026/2027 COMPLETE
ACCURATE EXAM REAL QUESTIONS WITH
WELL ELABORATED ANSWERS. (100%
CORRECT VERIFIED SOLUTIONS)
1. Which fixative is most appropriate for preserving glycogen
in liver tissue?
A) Bouin’s solution
B) 10% neutral buffered formalin (NBF)
C) Absolute ethanol
D) Zenker’s fixative
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Correct Answer: C
Rationale: Glycogen is water-soluble. Aqueous fixatives cause
glycogen loss. Absolute ethanol precipitates and preserves
glycogen.
2. A biopsy arrives for PCR analysis. Which fixative should be
avoided?
A) 10% NBF
B) 95% ethanol
C) Bouin’s solution
D) Carnoy’s fixative
Correct Answer: C
Rationale: Bouin’s contains picric acid which crosslinks nucleic
acids and inhibits PCR. Ethanol-based fixatives are preferred
for molecular studies.
3. The primary action of formalin fixation is:
A) Dehydration
B) Crosslinking of proteins via methylene bridges
,Page 3 of 146
C) Precipitation of nucleic acids
D) Lipid extraction
Correct Answer: B
Rationale: Formaldehyde forms methylene bridges between
lysine residues, stabilizing tissue structure.
4. Optimal thickness for routine formalin-fixed paraffin-
embedded (FFPE) tissue sections is:
A) 1–2 microns
B) 3–5 microns
C) 8–10 microns
D) 15–20 microns
Correct Answer: B
Rationale: 3–5 microns allows good staining and cellular
detail. Thicker sections cause overlapping nuclei.
5. Which fixative is best for preserving lipofuscin?
A) Formalin
B) Glutaraldehyde
, Page 4 of 146
C) Bouin’s
D) Carnoy’s
Correct Answer: A
Rationale: Formalin preserves lipofuscin well due to its
autofluorescent properties.
6. Prolonged fixation in formalin (>72 hours) can cause:
A) Enhanced IHC staining
B) Over-hardening and antigen masking
C) Better DNA preservation
D) Reduced background staining
Correct Answer: B
Rationale: Over-fixation creates excessive crosslinks that mask
epitopes, requiring antigen retrieval.
7. The purpose of buffer in 10% NBF is to:
A) Speed up fixation
B) Prevent formulin pigment formation
HISTOTECHNOLOGIST CERTIFICATION
ACTUAL EXAM 2026/2027 COMPLETE
ACCURATE EXAM REAL QUESTIONS WITH
WELL ELABORATED ANSWERS. (100%
CORRECT VERIFIED SOLUTIONS)
1. Which fixative is most appropriate for preserving glycogen
in liver tissue?
A) Bouin’s solution
B) 10% neutral buffered formalin (NBF)
C) Absolute ethanol
D) Zenker’s fixative
,Page 2 of 146
Correct Answer: C
Rationale: Glycogen is water-soluble. Aqueous fixatives cause
glycogen loss. Absolute ethanol precipitates and preserves
glycogen.
2. A biopsy arrives for PCR analysis. Which fixative should be
avoided?
A) 10% NBF
B) 95% ethanol
C) Bouin’s solution
D) Carnoy’s fixative
Correct Answer: C
Rationale: Bouin’s contains picric acid which crosslinks nucleic
acids and inhibits PCR. Ethanol-based fixatives are preferred
for molecular studies.
3. The primary action of formalin fixation is:
A) Dehydration
B) Crosslinking of proteins via methylene bridges
,Page 3 of 146
C) Precipitation of nucleic acids
D) Lipid extraction
Correct Answer: B
Rationale: Formaldehyde forms methylene bridges between
lysine residues, stabilizing tissue structure.
4. Optimal thickness for routine formalin-fixed paraffin-
embedded (FFPE) tissue sections is:
A) 1–2 microns
B) 3–5 microns
C) 8–10 microns
D) 15–20 microns
Correct Answer: B
Rationale: 3–5 microns allows good staining and cellular
detail. Thicker sections cause overlapping nuclei.
5. Which fixative is best for preserving lipofuscin?
A) Formalin
B) Glutaraldehyde
, Page 4 of 146
C) Bouin’s
D) Carnoy’s
Correct Answer: A
Rationale: Formalin preserves lipofuscin well due to its
autofluorescent properties.
6. Prolonged fixation in formalin (>72 hours) can cause:
A) Enhanced IHC staining
B) Over-hardening and antigen masking
C) Better DNA preservation
D) Reduced background staining
Correct Answer: B
Rationale: Over-fixation creates excessive crosslinks that mask
epitopes, requiring antigen retrieval.
7. The purpose of buffer in 10% NBF is to:
A) Speed up fixation
B) Prevent formulin pigment formation
