AST Surgical Technologist Practice Exam 2025 – Complete All-in-One Guide for Exam Success

Catgut is a type of suture that is absorbable and commonly used in internal tissues. It is made from the natural collagen found in the intestines of sheep or cattle, which allows it to be absorbed by the body over time, eliminating the need for removal. This property makes catgut particularly suitable for use in areas where sutures need to be in place only until the tissue has healed.

In contrast, silk, polypropylene, and nylon are examples of non-absorbable sutures. Silk is often used for its handling properties and is ideal for superficial tissues or where long-term strength is needed, but it does not dissolve in the body. Polypropylene and nylon are synthetic materials that also do not absorb and are typically used for skin or external applications where long-term durability is required. Thus, catgut's absorbable nature is what distinguishes it for use in internal suturing, making it effective for internal tissue repair without the concern of needing later removal.