How long after I cut my hair will the sample last?

A hair sample will last months after it is cut as long as it is stored in a clean paper envelope. So, you may cut a sample and then send it to us a month or two later. Ideally, you want to use a sample that has been cut more recently so that the information is more current, but an older hair sample may be used if needed. Some people will have to grow and cut their hair multiple times to get enough hair for the test (such as babies with sparse hair, or those who keep their hair buzzed very short). In such cases, the hair can be collected over multiple trimmings and saved in a paper envelope to be sent in when there is enough.