What is the OSHA blood lead level that triggers a warning and requires return to work if previously poisoned?

The OSHA standard indicates that a blood lead level of 40 micrograms per deciliter (ug/dL) is the threshold that triggers a warning for employees who have been previously exposed to lead and may have experienced lead poisoning. When an individual's blood lead level reaches this point, it prompts the employer to take necessary precautions, which may include medical evaluation and monitoring. If a worker's blood lead level is at or above this level, they may be temporarily removed from lead exposure to prevent further health risks. This measure aligns with OSHA's regulations aimed at protecting workers' health in environments where lead exposure is a concern.