Fundamentals of Histopathology: Decalcification

Histopathology

A comprehensive overview of the decalcification process in histopathology, covering agents, procedures, end-point testing, and troubleshooting for bone tissue specimens.

Laboratory Science Histology Pathology

15 Questions Medium Ages 18+ Oct 5, 2026

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About this Study Set

This study set covers Histopathology through 15 practice questions. A comprehensive overview of the decalcification process in histopathology, covering agents, procedures, end-point testing, and troubleshooting for bone tissue specimens. Every question includes the correct answer so you can learn as you go — pick any format above to get started.

Questions & Answers

Browse all 15 questions from the Fundamentals of Histopathology: Decalcification study set below. Each question shows the correct answer — select a study format above to practice interactively.

1 What is the primary purpose of the decalcification process?

A To fix the tissue
B To remove inorganic calcium from organic matrices
C To stain the collagen fibers
D To embed the tissue in paraffin

2 At what stage of the tissue processing workflow is decalcification performed?

A Before fixation
B After tissue embedding
C After fixation and before routine processing
D After microtome sectioning

3 What is the recommended thickness for bone tissue slices to ensure optimal fixative penetration?

A 10-15 mm
B 2-6 mm
C 0.1-0.5 mm
D 20-30 mm

4 Which of the following is a disadvantage of strong inorganic acids like nitric acid?

A They are too slow
B They cause excessive tissue swelling
C They can damage tissue antigens if used over 24-48 hours
D They cannot be used for biopsy

5 What is the optimal pH range for EDTA to perform effectively as a chelating agent?

A pH 1-2
B pH 3-5
C pH 7.0-7.4
D pH 12-14

6 Which type of specimen is most suitable for EDTA decalcification?

A Urgent diagnostic samples
B Specimens requiring immunohistochemistry or electron microscopy
C Heavily mineralized cortical bone for same-day results
D Needle biopsies only

7 What phenomenon indicates the progress of decalcification in the 'bubble test'?

A Change in liquid color
B Formation of carbon dioxide gas bubbles on the bone surface
C Precipitation of calcium oxalate
D Reduction in tissue weight

8 What is the main benefit of using the Calcium Oxalate chemical test?

A It is non-destructive to the tissue
B It is instantaneous
C It works for EDTA without modification
D It is only for strong acids

9 What is a potential risk of over-decalcification?

A Tissue becomes too hard to cut
B Loss of nuclear staining (pinkish staining)
C Increased enzyme activity
D Better DNA preservation

10 How can 'bone dust' artifacts be minimized during grossing?

A By using a blunt knife
B By using a fine-tooth saw and rinsing thoroughly
C By skipping the washing step
D By increasing the fixation time

11 What is the corrective measure for a block that shows incomplete decalcification during microtomy?

A Discard the sample
B Surface decalcification
C Increase the room temperature
D Re-fix in formalin

12 Why must formalin be thoroughly washed away before placing tissue in Hydrochloric acid?

A To prevent tissue hardening
B To avoid the production of carcinogenic gas
C To improve staining quality
D To speed up the process

13 Which factor accelerates the decalcification process but risks tissue damage?

A Lowering the temperature
B Increasing the concentration
C Using EDTA
D Reducing agitation

14 What is the main disadvantage of the physical probing method for end-point testing?

A It requires expensive equipment
B It is highly subjective and causes tissue artifacts
C It takes too long
D It is only for soft tissues

15 Why is agitation recommended during the decalcification process?

A To cool the solution
B To increase fluid exchange and calcium removal
C To prevent the formation of bubbles
D To fix the proteins

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