Reactions to the Mantoux test of 5 mm. or more of induration were classified as positive. The results of the seventy-two-hour readings are shown in Table 1.

What is a PPD test? ... "an induration on the skin of 15 millimeters or more is usually considered a positive TB result in healthy individuals," says Doyle.

When checked by a healthcare professional, "an induration on the skin of 15 millimeters or more is usually considered a positive TB result in healthy individuals," says Doyle.

When checked by a healthcare professional, "an induration on the skin of 15 millimeters or more is usually considered a positive TB result in healthy individuals," says Doyle.

When checked by a healthcare professional, "an induration on the skin of 15 millimeters or more is usually considered a positive TB result in healthy individuals," says Doyle.

What is a PPD test? ... This thickening and hardening of tissue is called an induration and the size of it is measured by your doctor in a return visit 48 to 72 hours after the initial injection ...

What is a PPD test? ... "an induration on the skin of 15 millimeters or more is usually considered a positive TB result in healthy individuals," says Doyle.

PPD tests are suggested for a number of reasons but "are most commonly recommended when a person has been in contact with a person infected with tuberculosis," says Dr. Cathy Hewison, a physician ...