Fixative for pathological specimens – MCQ

Which chemical is the most commonly used as a fixative for pathological specimens?
A. Picric acid
B. Mercuric chloride
C. Ethanol
D. Formaldehyde

Correct answer : D. Formaldehyde

• Fixation is the process by which the morphological features of tissues are preserved
• All of the above chemicals can be used a fixatives for pathological specimens
• But formalin (solution of formaldehyde in water) is the most commonly used fixative
• Formaldehyde is a colourless gas at room temperature with a pungent smell