Standard&Poor's Ratings Services today assigned its 'AA-' rating to Trinity Health (TH), Mich.'s $138.65 million variable rate health system revenue and refunding bonds, series 2004A, B, D, E, and F, and affirmed its 'AA-' and 'AA-/A-1+' rating and underlying rating (SPUR) on approximately $1.6 billion of outstanding bonds issued for Trinity Health and affiliated Mercy Health Services Obligated Group, and Mercy Mt. Clemens Corp. The series 2004 bonds are expected to be insured at bond closing and, upon issuance of the applicable bond insurance policies, the ratings assigned herein will be converted to SPURs. A separate Franklin County, Ohio, $44.82 million series 2004C variable rate demand bond issue for TH is expected to sell shortly and be rated