Editing Mantoux test (section)

==Classification of tuberculin reaction==
The results of this test must be interpreted carefully.  The person's medical risk factors determine at which increment (5&nbsp;mm, 10&nbsp;mm, or 15&nbsp;mm) of induration the result is considered positive.<ref>From the CDC team of the CDC team at the Saskatchewan Lung Association, [http://www.lung.ca/tb/tbtoday/tbdiagnosis/skin_test.html photos of a PPD bump] {{webarchive|url=https://web.archive.org/web/20070321005807/http://www.lung.ca/tb/tbtoday/tbdiagnosis/skin_test.html |date=2007-03-21 }}.</ref> A positive result indicates TB exposure.
* 5&nbsp;mm or more is positive in
** An HIV-positive person
** Persons with recent contacts with a TB patient
** Persons with nodular or fibrotic changes on chest X-ray consistent with old healed TB
** Patients with organ transplants, and other immunosuppressed patients
* 10&nbsp;mm or more is positive in
** Recent arrivals (less than five years) from [[Tuberculosis#Epidemiology|high-prevalence countries]]
** Injection drug users
** Residents and employees of high-risk congregate settings (e.g., prisons, nursing homes, hospitals, homeless shelters, etc.)
** [[Mycobacteria|Mycobacteriology]] lab personnel
** Persons with clinical conditions that place them at high risk (e.g., [[diabetes]], prolonged [[corticosteroid]] therapy, [[leukemia]], [[renal failure|end-stage renal disease]], chronic [[malabsorption]] syndromes, low body weight, etc.)
** Children less than four years of age, or children and adolescents exposed to adults in high-risk categories
* 15&nbsp;mm or more is positive in
** Persons with no known risk factors for TB<ref>[http://www.eac.int/health/index.php?option=com_content&id=79%3Aclassification-system&Itemid=34 Mantoux Test] {{Webarchive|url=https://web.archive.org/web/20160930155812/http://www.eac.int/health/index.php?option=com_content&id=79%3Aclassification-system&Itemid=34 |date=2016-09-30 }} in eac.int.</ref>

A tuberculin test conversion is defined as an increase of 10&nbsp;mm or more within a two-year period, regardless of age. Alternative criteria include increases of 6, 12, 15 or 18&nbsp;mm.<ref name="pmid9872812">{{cite journal|last=Menzies|first=Dick|title=Interpretation aof Repeated Tuberculin Tests|journal=American Journal of Respiratory and Critical Care Medicine|date=1 January 1999|volume=159|issue=1|pages=15–21|doi=10.1164/ajrccm.159.1.9801120|pmid=9872812}}</ref>