An unborn refers to stages in human development after zygote formation. A zygote is considered an embryo in particular from the period of conception to approximately the eighth week, and considered a foetus following this period until birth.
Samples from the embryo or foetus include samples from the embryonic/foetal membranes, fluids and excretions, the umbilical cord, and maternal samples (e.g. blood) containing embryonic/foetal material to be examined.
[Definition according to MDCG 2020-16 rev.1 No. 2]