Interpretation of Tuberculin Skin Test Results and Cut-points in Various Risk Groups
TST result |
Situation in which reaction is considered positive* |
---|---|
0-4 mm |
|
≥ 5 mm |
|
≥ 10 mm |
All others, including the following specific situations:
|
*The goal of testing for LTB is to identify individuals who are at increased risk for the development of tuberculosis and therefore would benefit from treatment of LTB. Only those who would benefit from treatment should be tested so a decision to test presupposes a decision to treat if the test is positive.
Source: Canadian Tuberculosis Standards, 7th edition 2013, Chapter 4, Table 2 © All Rights Reserved. Canadian Tuberculosis Standards, 7th Edition. Public Health Agency of Canada 2013.