Traditionally a hair test will provide approximately three months of detection. However, it is possible to both extend and lessen this detection window. How far we can go back all depends on the length of the donor’s head hair. If the donor has long enough hair we can provide testing that goes back six months to a year – or even longer.
Alternatively, if you need a test that won’t quite cover a three month window we can accommodate that as well. By requesting that the lab only test a limited section of the specimen we can reduce the detection window to only a month or two.