Iowa Code § 142C.12: Service but not a sale.

The procurement, removal, preservation, processing, storage, distribution, or use of parts for the purpose of injecting, transfusing, or transplanting any of the parts into the human body is, for all purposes, the rendition of a service by every person participating in the act, and whether or not any remuneration is paid, is not a sale of the part for any purposes. However, any person that renders such service warrants only under this section that due care has been exercised and that acceptable professional standards of care in providing such service according to the state of the medical arts have been followed. Strict liability, in tort, shall not be applicable to the rendition of such services.