My office runs some in-house labs for thyroid and hormone tests. Some of the samples are drawn, frozen, and ran a few days later. The question I'm coming across is if we are supposed to bill the labs under the date that the blood was drawn/collected or the date the test was ran? We do bill for a venipuncture (36415) as well, which I know would need to be billed under the date it was done...but unsure if it matters for the labs...