A320 FLT CREW CONTINUES TKOF AND CLBOUT AFTER BEING NOTIFIED THAT AN ILL PAX WENT INTO THE LAVATORY ON TKOF ROLL.

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WE HAD A 30 MIN TAXI TIME WITH TFC SATURATION AND DEP DELAYS. AS WE WERE CLRED INTO POS TO HOLD; WE WERE ADVISED IT WOULD BE A FEW MINS FOR RELEASE. UPON RECEIVING CLRNC FOR IMMEDIATE TKOF; THE FO RELEASED THE BRAKES AND STARTED ROLLING TOWARD A TOGA PWR SETTING. IMMEDIATELY; THE FLT ATTENDANT CALL BUTTON WENT OFF. I ANSWERED QUICKLY AND WAS ADVISED BY ONE OF THE AFT FLT ATTENDANTS THAT AN APPARENTLY ILL PAX JUST WENT INTO THE AFT LAVATORY. THE PAX SAID IT WAS 'AN EMER' AND COULD NOT WAIT. WE WERE NOW ACCELERATING SLOWLY PAST 40 KTS WITH THE FO WAITING FOR MY DECISION. I MADE AN IMMEDIATE SNAPSHOT OF THE SIT CONSIDERING ALL POSSIBLE CONSEQUENCES AND ISSUES. I DIRECTED THE FLT ATTENDANT TO TELL HIM TO STAY IN THE LAVATORY AND DO NOT LET HIM OUT UNTIL I CALL BACK WHEN SAFELY AIRBORNE. I TOLD THE FO TO CONTINUE THE TKOF ROLL. THE PAX WAS NOW LOCKED IN THE LAVATORY FOR THE TKOF IN-PROGRESS AND CLBOUT AS PER MY INSTRUCTIONS. UPON REACHING A SMOOTH ALT; I DIRECTED THE FLT ATTENDANT TO LET HIM OUT OF THE LAVATORY AND HE RETURNED TO HIS SEAT. IT WAS AN UNEVENTFUL FLT FROM THAT POINT ON. THERE WERE MANY VARIABLES IN THE EQUATION SUCH AS PENDING HOT BRAKES FROM THE LONG DOWNHILL TAXI AND DELAYS; 'FAM'S' ON BOARD; LOSS OF REVENUE/CONNECTIONS; FURTHER TKOF DELAYS FROM HOT BRAKES; REMOVAL OF AN ILL PAX; SAFETY OF THE PAX IN THE LAVATORY CONSIDERING ABORT; AND CLBOUT TURB; ETC.