Emil Rothstein, M.D.
JAMA. 1933;101(12):946. doi:10.1001/jama.1933.02740370050027.
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To the Editor:  —In The Journal, July 15, is an article by Manheims and Brunner on faulty blood grouping due to autoagglutinins. One precaution to avoid such false interpretations is suggested in the form of cross-matching before the transfusion. However, faulty blood grouping, even when detected in time to avert a serious transfusion reaction, is a cause of delay, expense and embarrassment; occasionally the patient may suffer by the delay. At the Brooklyn Jewish Hospital, where all transfusions are performed by the Department of Pathology under the continual personal supervision of Dr. Silik Polayes, it is the rule that when an AB blood is found it is immediately tested for auto-agglutination by the mixing of one drop each of the patient's cell suspension and patient's serum at room temperature. If agglutination is present, regrouping is performed with washed cells. Careful attention to such and similar details will bring to a


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