. :,, Dr. Robert Conrad -3- October 23, 1975 Here, at LASL we employ the specific gravit,y-v.olume correction, primarily because of the added work load and cost of creatinine determinations. If I can be of further se-rvice,please let me know. Sincerely, 1 JNPL:cr Encls.a/s (3) xc: ISD-5 (2) File w/encl.