It's usually 50 ng/ml on the immunoassay and 15ng/ml on the GC/MS or if they use 20ng/ml on the immunoassay they usually use 10 ng/ml on the GC/MS. It is possible for it to be a 20 and 10 ng/ml test. Yes you might not think it necessary in your field but maybe the employer has chose it for whatever reason.

Sensi, you mentioned in a post that "based on the online calculator" that you felt you were at 26 ng/ml. It looks like you have figured out that 20 ng/ml home tests are non existant or near impossible to find and that you are basing this on a worst case scenario of a half life of 10 days? Is this how you came up with it?