WHILE I DONT CARRY A DONOR CARD,I,M A PLASMA DONOR AND BLOOD GOLDCARD HOLDER .ADMITTEDLY ITS NOT DONATING ORGANS,BUT WAS DONATING PLASMA FORTNIGHTLY FOR YEARS.MY LEFT ARM LOOKS LIKE A USERS PML.PLASMA IS IN YOUR WHITE BLOOD CELLS,SO YOU DONATE 2 PINTS OF BLOOD,THEN GET IT SEPARATED VIA A CENTRIFUGE,THEN GIVEN YOUR RED CELLS BACK ,TAKES ABOUT AN HOUR.