A service provided by the BC Centre for Disease Control

For health care practitioners

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Calculating HIV window periods

This HIV window period calculator tool was developed to help clinicians discussing HIV testing with individuals who may have been exposed to HIV. The tool should be used when an individual can give an approximate date of when they were potentially exposed to HIV. It is not useful for people who have unprotected sex or other higher risk sexual activities on a regular basis.

Calculating HIV window periods