Document Oz31Q6v6Qy3nwr9p2jmZjrymL

U g U 3 t 1, 1953 Dp . George P. Rouse 2031 Locust Street Philadelphia, Pa. Dear Doctor Rouse; I an sending you herewith the results of ^a analysis of the urine and blood of together with an interpretation of the ret In commenting on the attached report and Its recorded interpretation, I believe It may be of interest to you to call attention specifically to the f1low normal" con centration of lead In the urine. Thi. 3 Is no surprise to ns, and it will not surprise you, but It is of some con sequence to recognize that, following the absorption of significant quantities of tetraethyl lead from any source, or over any length of time, the concentration of lead in the blood undergoes little or no change, while the urinary lead concentration goes to high levels which vary with the severity of the exposure. This result, therefore is doubly significant. RAK:S3 Cordially yours, 1. lioberi 'A . Kehbe, RT~d 7