 For example, some argue that the so-called ultra-rapid metaboliser, who has extra copies of the 2D6 gene expressed, cannot be reliably tested.Also, the test does not cover some rarer genotypes, nor genotypes that have not yet been discovered.Also, insurance companies still do not cover the price of the test, which can cost $600–$1300 to the patient, because the test is "experimental, investigational or unproven".