Relationship Between Renal Angina Index and D-Dimer Improvement Towards Acute Kidney Injury in Covid-19 Patients in Special Isolation Room of Dr. Soetomo Hospital Surabaya Fadhil Rasyid, Bambang Pujo Semedi*, Arie Utariani, and Teuku Aswin Abstract Since the World Health Organization (WHO) declared COVID-19 as pandemic in March 2020, the number