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To the Editor:—
As director of the Blood Bank of Queens County it seems to me quite necessary that every person should know his blood type and Rh factor and carry a card with the information on his person at all times.In the work we started here in 1942 we have typed more than 5,000 people in and around Queens County. Several large business concerns have a list of these types in their files so that in an emergency one or more compatible donors may be sent to the hospital when the patient is admitted.We have determined the Rh factor on the last 2,000 and have a voluntary list of 185 Rh negative donors of all types available on call for emergencies.All persons typed have in addition to their own type and Rh factor the names of six persons of their acquaintance of the same type and
Madden EJ. IDENTIFICATION CARD FOR BLOOD DONORS. JAMA. 1945;128(3):225. doi:10.1001/jama.1945.02860200065025
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