On March 26, 2004, the Clinical Chemistry Laboratory will offer plasma assays for Aldosterone and Renin, (Direct). The required specimen is a Lavender top tube (EDTA). Both assays are collected and processed at room temperature and can be performed on the same sample. The University of Iowa Hospitals and Clinics patient charge for Aldosterone is $145.00 and Renin, (Direct) is $78.00. For further information and test limitation, see the Pathology Laboratory Services Handbook. If you have questions, please contact Dr. George Johnson (356-1805) or Dr. Ronald Feld (356-1759).