§ 3121. Physical or mental examination. (a) Notice of examination.
After commencement of an action in which the mental or physical
condition or the blood relationship of a party, or of an agent, employee
or person in the custody or under the legal control of a party, is in
controversy, any party may serve notice on another party to submit to a
physical, mental or blood examination by a designated physician, or to
produce for such examination his agent, employee or the person in his
custody or under his legal control. The notice may require duly executed
and acknowledged written authorizations permitting all parties to
obtain, and make copies of, the records of specified hospitals relating
to such mental or physical condition or blood relationship; where a
party obtains a copy of a hospital record as a result of the
authorization of another party, he shall deliver a duplicate of the copy
to such party. A copy of the notice shall be served on the person to be
examined. It shall specify the time, which shall be not less than twenty
days after service of the notice, and the conditions and scope of the
examination.

(b) Copy of report. A copy of a detailed written report of the
examining physician setting out his findings and conclusions shall be
delivered by the party seeking the examination to any party requesting
to exchange therefor a copy of each report in his control of an
examination made with respect to the mental or physical condition in
controversy.