[USMA:30670] pints of blood

[Euric]

If I donate a pint, how much blood am I really donating?   The collection bags hold 450 mL of product.  The standard US pint is 473 mL.  When you say pint, do you mean 473 mL or the 450 mL the bag holds.  What means do you use to measure a pint?    When you say gallon, do you mean 3.785 L based on a 473 mL pint, or do you mean 3.6 L, based on the 450 mL capacity of the bag?   Below you mention a donor who has given 24 gallons.  How much did he actually give?  Based on the standard definition of the gallon, that would be 91 L.  Based on the amount of blood held in the bags, that would be about 86.5 L.   That is a 4.5 L difference in the two meanings.   I'm just curious to know how you determine the amount of blood in a pint and gallon.         American Red Cross Recognizes 24 Gallon Blood Donor     Philadelphia, PA, April 29th, 2004 � Montgomery County�s Hal Kellogg Has Been Donating Blood for 70 Years Proving that there is no age limit to donate blood, Howard �Hal� Kellogg recently gave his 24 gallon blood donation for the American Red Cross at the age of 88.    Thanks,   Euric