Which of the following substances is not considered a bio-hazardous substance?

• A. A Microscope Slide
• B. B Syringe
• C. C Needle
• D. D Scalpel blade

Answer: (B)

The main idea is that hazard designation depends on infectious content, not just the item’s form. A syringe, when sterile and unused, is a medical device with no biological material inside, so it isn’t considered a biohazardous substance by itself. The risk with syringes arises only if they are contaminated with blood or body fluids, which would then make them and the waste generated from them a biohazard. In contrast, a scalpel blade and a needle are sharp items that frequently contact tissues and fluids and are routinely treated as biohazardous waste when contaminated. A microscope slide can carry biological material on its surface, so contaminated slides are also handled as potentially biohazardous. Thus, the syringe stands out as not inherently a biohazardous substance, since its hazard depends on whether it has been contaminated.