Which decalcifying agent is used for urgent biopsies?

• A. Von Ebner's (HCl)
• B. Nitric Acid
• C. Hydrochloric Acid With Formic Acid
• D. Ethanol

Answer: (A)

For urgent biopsies, you need calcium removed as quickly as possible to cut and stain the tissue without delaying the diagnosis. Von Ebner’s solution is a rapid, hydrochloric acid–based decalcifier chosen for this scenario because it decalcifies fast, allowing timely sectioning and evaluation.

While strong acid decalcifiers like HCl-based solutions work quickly, they can affect tissue detail if used too long. Von Ebner’s is preferred in urgent cases precisely for its speed, balancing the need for rapid processing with acceptable preservation of morphology for diagnostic review. Other acids, such as nitric acid, can be even more aggressive and cause more tissue damage, and a formic-acid–based decalcifier is typically slower or used when preservation is prioritized. Ethanol does not decalcify at all, so it cannot be used for this purpose.