Massachusetts General Laws Part I. Administration of the Government (Ch. 1-182) Ch. 113A, § 10

(a) An individual authorized to make an anatomical gift under section 9 may make an anatomical gift by a document of gift signed by the individual making the gift or by that individual’s oral communication that is electronically recorded or is contemporaneously reduced to a record and signed by the individual receiving the oral communication.

(b) Subject to subsection (c), an anatomical gift by a person authorized in section 9 may be amended or revoked orally or in a record by any member of a prior class who is or becomes reasonably available after the execution of the document of gift. If more than 1 member of the prior class is or becomes reasonably available after the document of gift was executed, the gift made by an individual authorized under section 9 may be:

(c) A revocation under subsection (b) shall be effective only if the procurement organization, transplant hospital, physician or technician knows of the revocation before an incision has been made to remove a part from the donor’s body or before an invasive procedure has begun to prepare the recipient.