Final answer:
The Mantoux test is considered positive if the induration is greater than a certain measure. Commonly, a measurement of 5 millimeters or greater is considered positive for individuals with certain risk factors, while a measurement of 10 millimeters or greater is considered positive for individuals without any specific risk factors.
Step-by-step explanation:
The Mantoux test is considered positive if the induration, which is a raised red area that is hard to the touch, is greater than a certain measure. The size of the induration is measured to determine the final result. The specific measurement that indicates a positive result may vary depending on factors such as the individual's risk factors, previous vaccinations, and local guidelines, but commonly a measurement of 5 millimeters or greater is considered positive for individuals with certain risk factors, while a measurement of 10 millimeters or greater is considered positive for individuals without any specific risk factors.