SO much (fake) blood gets spilled during “The Lieutenant of Inishmore” that it seems only fair that the goriest show on Broadway give some back. And so it will – by sponsoring a (real) blood drive.

On Tuesday, from 10 a.m. to 3:30 p.m., a blood mobile will be parked outside the Lyceum Theatre at 149 W. 45th St., to collect donations for the New York Blood Center. Donors must be 17 and older, weigh at least 110 pounds and not have given blood in the last 56 days. The first 50 donors will get a ticket to the show.

For an appointment, call (646) 812-9035.