Which of the following is classified as regulated (biohazardous) waste after use on a patient?

Correct answer: C. A scalpel blade used during oral surgery

• A. An empty anesthetic carpule without visible blood contamination is NOT regulated waste — it is pharmaceutical waste. Carpules WITH visible blood are regulated.
• B. Unused gauze is neither contaminated nor regulated — it is uncontaminated solid waste.
• C. CORRECT. A scalpel blade used during oral surgery is a contaminated sharp that contacts blood and tissue — it is both a sharp waste AND regulated biohazardous waste. Used scalpel blades must be disposed of in a puncture-resistant sharps container designated for biohazardous waste.
• D. A paper bib with saliva alone is generally not classified as regulated waste unless saturated with blood. Saliva without visible blood is considered potentially infectious but typically managed as regular waste or treated waste depending on state regulations.