What is one method to ensure you’re not allergic to a substance before working with it?

Conducting a patch test on unexposed skin is a prudent method to determine if an individual is allergic to a specific substance before handling it. This involves applying a small amount of the substance to a small area of skin, usually on the forearm, and monitoring the area for any allergic responses, such as redness, swelling, or irritation over a specified period. This controlled exposure minimizes risk and allows for the detection of allergies in a safe manner.

Inhaling a substance to check for reactions poses significant risks, as it can lead to immediate and potentially severe allergic responses, including respiratory distress. Waiting for a reaction to occur increases the likelihood of a serious allergic incident, which can complicate or necessitate emergency medical intervention. Asking someone else about their allergies does not provide personal information relevant to one's own responses and can lead to complacency regarding personal safety. Thus, performing a patch test is the safest and most effective method for identifying potential allergic reactions before exposure in a laboratory setting.