how long must you wait to give blood again
You can donate platelets once in a seven day period and up to 24 times a year. You must wait at least 72 hours after donating platelets before donating whole blood. After an automated double red cell collection, you must wait 112 days before donating again. In any eight (8) week period, you can make one blood donation and one platelet donation or six (6) platelet donations.