<prompt> Apheresis platelet donation--true is all except:A person with below normal platelet count can donatePerson can donate again after 2 daysPerson can donate 2 times maximum in a weekNot more than 24 donations can be done in 1 year  <response>: Ans. A.A person with below normal platelet count can donateExplanationSpecific Eligibility Criteria for Apheresis Platelet DonorsAge: 18-60 years and Weight- 50 kg This is not just for platelet donation but also for all blood and blood product donations in IndiaDonor platelet count must be 1,50,000dL Option aIf taking anti-platelet medication:Aspirin- defer for at least 2 full medication-free daysClopidogrel or ticlopidine - defer for at least 14 full medication-free daysFrequency of donations:Can donate up to 2 times in a week Option c24 times in a year Option dMinimum interval between donationsMinimum of a 48 hour-interval needed after donating single unit Option b7 days after donating double or triple units.Other important points about platelet transfusionThreshold for prophylactic platelet transfusion is 10,000mL.In patients without fever or infections, a threshold of 5000mL may be sufficient to prevent spontaneous hemorrhage.For invasive procedures, the usual target level is 50,000mL platelets.Platelets are produced in two ways:Random donor RD platelets: Whole blood donations are centrifuged and the buffy coats between the red cell and plasma layers from four donations are pooled in the plasma of one of the donors.Single donor apheresis platelets SDAP: Platelets are obtained from a single donor by apheresis. SDAP contain the equivalent of at least 6 units of RD platelets and have fewer contaminating leukocytes than pooled RD platelets.Time required in collecting SDAP is 2 to 3 hours in RD its 30 mins.Storage--20-24degC with agitationShelf life--5 days 7 days if bacterial screening 