has part informed consent form signed informed consent form An informed consent form that has been signed by at least one participant. Note from J. Neil Otte (7.24.18): 'signed informed consent form' is not a synonym nor subclass of 'complete informed consent form indicating consent'. A signed informed consent form may bear the signature of a witness or doctor, but not yet be complete. Also, a complete informed consent form may need only have been stamped or witnessed by checking a box in an electronic form, and may not require a signature. Yongqun He signature