What is the name of the test that uses PPD to screen for tuberculosis?

The test that uses PPD (purified protein derivative) to screen for tuberculosis is known as the Mantoux test. This method involves intradermal injection of PPD and subsequent evaluation of the induration, or swelling, at the injection site after 48 to 72 hours. A positive reaction indicates exposure to the tuberculosis bacteria, although it does not differentiate between active disease and latent infection.

The other tests mentioned serve different purposes. The QuantiFERON test is a type of blood test that also screens for tuberculosis but does not involve PPD. A chest X-ray is used to visualize the lungs and can help diagnose active tuberculosis, but it is not a screening test. The sputum test analyzes samples from the lungs for the presence of the tuberculosis bacteria, typically used to confirm active disease rather than screen for it. Hence, the Mantoux test is specifically designed for tuberculosis screening using PPD, making it the correct choice.