We had this situation.  The tech had problems with a previous pregnancy,
and questioned the effect of formalin exposure.  We did not assign her to
the grossing where she would come in contact with formalin.

However, just prior to that we had several residents who grossed tissue
almost until the hour of delivery.  There were apparently no problems
associated with that.  However our director of Anatomic Pathology felt it
better to respond to the problem.

Susan