$4,000?  Obviously your client is a vampire who has a Schedule C for being in the business of collecting blood.  The question is - is this a Sec. 199A QBI activity?

On a side note what is the cost of your own blood.  If it's the sale of personal property not at a gain then I would think it's ignored?  Curious to hear other answers.

And next we'll hear about donating sperm and more.........