Renal Angina Index calculation. The Renal Angina Index is obtained by multiplying the Risk Score and the Injury Score of patients at 12 h of PICU admission. The Risk Score default to 1 for anyone in the PICU, it increases to 3 for solid organ or bone marrow transplant recipients or to 5 if the patient is mechanically ventilated and on pressor. The injury score is attributed a value of 1, 2, 4, or 8 based on the rise of SCr compared with the patient baseline or the %FO at 12 h of PICU admission, whichever value is highest