Medkit: The medkit includes drug supplies, bandages, tools,
and a (talkative) doctor-expert system that will advise the user on
techniques to handle most typical medical emergencies (including
fractures, gunshot wounds, chemical wounds, and poisoning, as well
as offering advice for the treating of shock, handling blood loss, and
of course performing resuscitations). The medkit’s rating adds to the
dice pool of all First Aid Tests, and replaces the character’s skill if the
character doesn’t possess the skill (Medkits and Autodocs, p. 253). It
must be refilled regularly (usually after every mission, gamemaster’s
discretion).
pg 337, SR4a
EDIT: Ninja'd