CAB BECOMES VERY ILL IN FLT. PAX LOCKED IN LAVATORY. VECTORS TO EXPEDITE APCH. AMBULANCE CALLED.

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FLT ATTENDANT X ENTERED THE COCKPIT TO SAY THAT A PAX WAS LOCKED IN THE LAVATORY AND LAVATORY COULD NOT BE OPENED FROM INSIDE OR OUTSIDE. I SENT HER BACK WITH A SCREWDRIVER TO GIVE TO MALE FLT ATTENDANT Y. IN APPROX 1 MIN SHE RETURNED TO SAY FLT ATTENDANT Y WAS ON THE AFT FLT ATTENDANT JUMPSEAT WITH SEVERE ABDOMINAL PAIN. EXTRA FLT ATTENDANT Z; WHO WAS HELPING FLT ATTENDANT Y; THEN CAME UP AND STRESSED SEVERITY OF PAIN; AND THAT SHE AND A PAX WHO WAS AN ANESTHETIST RECOMMENDED WE CALL AN AMBULANCE. I REQUESTED APCH CTLR CALL AN AMBULANCE. GOT A VECTOR FOR TIME TO TAKE CARE OF THE PROBLEM. AS I RECALL; I TOLD APCH CTL WE HAD AN EMER WITH A FLT ATTENDANT. I DID NOT DECLARE AN EMER. I DIRECTED FO TO CONTINUE TO FLY THE ACFT WHILE I WENT BACK TO OPEN THE LAVATORY DOOR AND CHK ON FLT ATTENDANT. I MADE THIS ELECTION IN ORDER TO EXPEDITE ANY DECISIONS THAT MAY BE NECESSARY IN CABIN. I ASKED EXTRA FLT ATTENDANT Z TO REMAIN IN THE COCKPIT TO ASSIST THE FO UNTIL I RETURNED. WHEN I GOT TO THE LAVATORY AREA/AFT JUMPSEAT AREA; THE LAVATORY WAS OPEN AND PAX; WHO WAS THE ANESTHETIST; WAS CARING FOR FLT ATTENDANT Y. I IMMEDIATELY RETURNED TO COCKPIT WE WERE VECTORED BACK TO LAND. THE AMBULANCE MET THE FLT AND REMOVED THE FLT ATTENDANT Y BEFORE ANY PAX WERE DEPLANED. I HAD FLT ATTENDANT X ACCOMPANY FLT ATTENDANT Y IN AMBULANCE TO HOSPITAL. I THEN CALLED DISPATCH AND LET THEM KNOW WHAT HAD HAPPENED. I THEN CALLED CREW COORDINATOR AND ADVISED THEM OF SITUATION SAYING THAT I DID NOT EXPECT FLT ATTENDANT Y WOULD BE ABLE TO WORK NEXT DAY AND THAT I DID NOT HAVE A DIAGNOSIS. WE THEN WENT TO MOTEL AND PREPARED NOTES FOR ADDITIONAL RPTS. I CALLED HOSPITAL (ST. LUKES IN FARGO; ND) AND FLT ATTENDANT X SAID FLT ATTENDANT Y WAS OK. HE WAS DIAGNOSED WITH A SPASTIC COLON. HE WAS DISCHARGED AND RETURNED TO MOTEL SHORTLY THEREAFTER. HE SAID HE PLANNED TO CONTINUE TO WORK THE TRIP. I HAD HIM CALL CREW COORDINATOR. I ADVISED THE REMAINING PERSONS/AGENCIES AS PER FLT OPS MANUAL.