When is it appropriate to test more than one door in the same room?

Testing more than one door in the same room is appropriate when the doors are differently painted or glazed. The reason for this is that different finishes can significantly affect the amount of lead dust that might settle on the surface and the risk of lead exposure. Paint applied to surfaces can contain varying amounts of lead, and if the doors have been painted or glazed with different materials or colors, they may present different risks for lead exposure.

The condition and composition of the paint are critical factors to understand when assessing lead hazards. Different paint types can degrade at different rates, and if one door has a lead-based paint while another does not, this creates the need for separate testing. Therefore, identifying these variations helps to ensure a thorough assessment of potential lead risks.

While testing doors based on their materials, ages, or locations could offer insights into the lead hazard context, the specific focus on differences in paint or glaze is pivotal because it directly relates to lead exposure risk assessments.