Complex Monitoring of Biochemical and Radionuclide Parameters in Patients with Metastatic Renal Cell Carcinoma during Immunotherapy

Table 1

Relationship between CKD and FSS gradation: a radionuclide estimate for the total renal function.

CKD stage	Renal function characteristic	GFR level (mL/min/1.73 m^2)	FSS characteristic	FSS index gradation
1	High and optimal	>90	Status 1; high level slightly decreased; (stable or conditionally stable compensation)	1a
2	Slightly decreased	60–89		1b
3а	Slightly decreased	45–59	Status 2; moderately decreased; (conditionally stable compensation, transitionally unsustainable level of compensation)	2a
3b	Significantly decreased	30–44		2b
4	Severely decreased	15–29	Status 3; moderately to severely decreased; (unstable compensation or decompensation)	3a; 3b
5	End-stage renal failure	<15	Decompensation	4