Tuberculosis (TB) testing utilizes a purified protein derivative (PPD) solution. Each batch of PPD is assigned a unique identifier and a date beyond which the product should not be used. These details ensure traceability and efficacy. For instance, a vial of tuberculin solution might be marked with a specific alphanumeric code and a future calendar date.
Proper documentation of these details is essential for accurate public health tracking and patient safety. The lot number allows for the rapid identification and recall of specific batches in the event of adverse reactions or diminished potency. The expiration date guarantees that the solution retains its effectiveness, preventing false negative results that could lead to the spread of infection. Historically, tracking systems like these have improved the reliability of diagnostic testing.