This article shows a cross sectional study in which shows that markers of acute kidney injury are present in hypertensive emergencies more than in hypertensive urgencies or controls. One of the markers used is neutrophil gelatinase-associated lipocalin (NGAL). Another marker used was cystatin C
To quote this article in bibliography using Chicago style :
Derhaschnig, U, C Testori, E Riedmueller, E L Hobl, F B Mayr and B Jilma. “Decreased renal function in hypertensive emergencies." Journal of Human Hypertension 28, no.7 (2014): 427-431. https://doi.org/10.1038/jhh.2013.132