Abstract
The article presents modern approaches to the diagnosis of lupus nephritis. Pathological changes are described, and characteristics of the lupus nephritis classes are given. The results of a histological examination of a kidney biopsy are the only reliable method for lupus nephritis diagnosing that is absolutely necessary for initiating therapy, since in most cases there are no clinical, laboratory or serological studies that can predict/replace the results of a renal biopsy with sufficient accuracy. To date, none of the serum or urinary biomarkers of the disease activity exceeds the information content obtained by histopathological examination of kidney biopsies. The presence of nephritis in patients with SLE is suspected based on an abnormal urine test and/or an increase serum creatinine; the diagnosis is confirmed by histological data from a renal biopsy. A kidney biopsy should be performed in most patients with SLE who have signs of kidney damage, not only for the purpose of diagnosis, but also for the lupus nephritis class. According to the results of a biopsy of the kidney, it is possible to establish the severity and activity of kidney damage, the involvement of the vessels and the tubular apparatus of the kidney; also identify alternative causes of renal failure. Thus, the classification of lupus glomerulonephritis is determined by the results of pathological studies. The article is illustrated with photographs of histopathological changes of the kidneys in various classes of nephritis.
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