Which option describes the fixative to specimen ratio twenty to one?

Which option describes the fixative to specimen ratio twenty to one?

• A. 5:1
• B. 10:1
• C. 20:1
• D. 15:1

Answer: (C)

The essential idea is having enough fixative to penetrate and preserve the tissue evenly. A twenty-to-one fixative-to-specimen ratio means twenty parts fixative for every one part of tissue, ensuring there is ample fixative to surround and diffuse through the specimen. This helps achieve uniform fixation and minimizes artifacts from under-fixation. Smaller ratios provide less fixative per tissue, risking slower penetration and poorer preservation, so twenty-to-one is the best standard for reliable fixation.

The essential idea is having enough fixative to penetrate and preserve the tissue evenly. A twenty-to-one fixative-to-specimen ratio means twenty parts fixative for every one part of tissue, ensuring there is ample fixative to surround and diffuse through the specimen. This helps achieve uniform fixation and minimizes artifacts from under-fixation. Smaller ratios provide less fixative per tissue, risking slower penetration and poorer preservation, so twenty-to-one is the best standard for reliable fixation.