In laboratory terms, what does a reading that is precise but not accurate indicate?

A reading that is precise but not accurate indicates that the results are consistently incorrect. Precision refers to the consistency of measurements; if multiple measurements yield similar results, they are precise. However, accuracy pertains to how close these measurements are to the true value. When a set of measurements is precise but not accurate, it signifies that while the results can be replicated reliably, they deviate from the actual or true value due to a systematic bias or error in the measurement process that skews all results in the same direction.

This observation suggests that there could be a persistent issue in the measurement process, such as a calibration issue or a consistent external influence affecting the readings. This context is crucial for understanding the reliability of measurements in risk assessment settings, particularly when dealing with lead exposure risks where both precision and accuracy are paramount for effective assessment and intervention strategies.