EXHIBIT 4.5 FIFTH AMENDMENT TO CREDIT AGREEMENT THIS FIFTH AMENDMENT TO CREDIT AGREEMENT (this "Fifth Amendment") is dated as of February 20, 1996, by and among PHYSICIANS CLINICAL LABORATORY, INC., a Delaware corporation (the "Borrower"), and OAKTREE...Credit Agreement • June 6th, 1997 • Physicians Clinical Laboratory Inc • Services-medical laboratories • California
