Page 1 of 172
NEW YORK HISTOTECHNOLOGIST
CERTIFICATION ACTUAL EXAM 2026/2027
COMPLETE ACCURATE EXAM REAL
QUESTIONS WITH WELL ELABORATED
ANSWERS. (100% CORRECT VERIFIED
SOLUTIONS)
1. Which of the following is the MOST common fixative
used in routine histology?
A) Bouin’s solution
B) Zenker’s fixative
C) 10% neutral buffered formalin (NBF)
D) Carnoy’s fixative
,Page 2 of 172
Answer: C) 10% NBF
Rationale: 10% NBF is the gold standard because it preserves
tissue architecture, is compatible with most stains, and is safe
for long-term storage.
2. A liver biopsy is received for fatty liver evaluation. Which
fixative would BEST preserve lipid droplets?
A) Formalin
B) Bouin’s
C) Formalin with calcium
D) Osmium tetroxide vapor
Answer: D) Osmium tetroxide vapor
Rationale: Lipids are dissolved by aqueous fixatives. Osmium
tetroxide fixes lipids by cross-linking unsaturated fatty acids.
3. What is the primary mechanism of action of
formaldehyde fixation?
,Page 3 of 172
A) Precipitation of proteins
B) Cross-linking of lysine residues
C) Denaturation of nucleic acids
D) Oxidation of sulfhydryl groups
Answer: B) Cross-linking of lysine residues
Rationale: Formaldehyde forms methylene bridges between
lysine amino groups and other amino acids.
4. Scenario: A pathologist notes poor nuclear chromatin
preservation in a lymph node fixed in 10% NBF for 72
hours. Most likely cause?
A) Overfixation
B) Underfixation
C) Hypothermic fixation
D) Insufficient buffer
, Page 4 of 172
Answer: A) Overfixation
Rationale: Prolonged formalin fixation (>48 hours) over-
crosslinks proteins, causing nuclear clumping.
5. Which fixative is preferred for glycogen preservation in a
muscle biopsy?
A) Formalin
B) Carnoy’s
C) Bouin’s
D) Absolute ethanol
Answer: D) Absolute ethanol
Rationale: Ethanol precipitates glycogen; aqueous fixatives
dissolve it.
6. Bouin’s fixative contains picric acid, which imparts what
color to tissue?
A) Red
NEW YORK HISTOTECHNOLOGIST
CERTIFICATION ACTUAL EXAM 2026/2027
COMPLETE ACCURATE EXAM REAL
QUESTIONS WITH WELL ELABORATED
ANSWERS. (100% CORRECT VERIFIED
SOLUTIONS)
1. Which of the following is the MOST common fixative
used in routine histology?
A) Bouin’s solution
B) Zenker’s fixative
C) 10% neutral buffered formalin (NBF)
D) Carnoy’s fixative
,Page 2 of 172
Answer: C) 10% NBF
Rationale: 10% NBF is the gold standard because it preserves
tissue architecture, is compatible with most stains, and is safe
for long-term storage.
2. A liver biopsy is received for fatty liver evaluation. Which
fixative would BEST preserve lipid droplets?
A) Formalin
B) Bouin’s
C) Formalin with calcium
D) Osmium tetroxide vapor
Answer: D) Osmium tetroxide vapor
Rationale: Lipids are dissolved by aqueous fixatives. Osmium
tetroxide fixes lipids by cross-linking unsaturated fatty acids.
3. What is the primary mechanism of action of
formaldehyde fixation?
,Page 3 of 172
A) Precipitation of proteins
B) Cross-linking of lysine residues
C) Denaturation of nucleic acids
D) Oxidation of sulfhydryl groups
Answer: B) Cross-linking of lysine residues
Rationale: Formaldehyde forms methylene bridges between
lysine amino groups and other amino acids.
4. Scenario: A pathologist notes poor nuclear chromatin
preservation in a lymph node fixed in 10% NBF for 72
hours. Most likely cause?
A) Overfixation
B) Underfixation
C) Hypothermic fixation
D) Insufficient buffer
, Page 4 of 172
Answer: A) Overfixation
Rationale: Prolonged formalin fixation (>48 hours) over-
crosslinks proteins, causing nuclear clumping.
5. Which fixative is preferred for glycogen preservation in a
muscle biopsy?
A) Formalin
B) Carnoy’s
C) Bouin’s
D) Absolute ethanol
Answer: D) Absolute ethanol
Rationale: Ethanol precipitates glycogen; aqueous fixatives
dissolve it.
6. Bouin’s fixative contains picric acid, which imparts what
color to tissue?
A) Red
