Table 2.

sFLC ratio distribution according to eGFR in the group of patients without active MM. sFLC ratio range increases when there is a decrease in eGFR. The number of false positives according to the the current normal range (Katzmann) also increases specially in patients with eGFR ≤55 ml/min

	eGFR ≥ 90 (n = 76)	eGFR 56–89 (n = 70)	eGFR ≤ 55 (n = 30)
sFLC ratio (IQR)	1,04 (0,85-1,3)	1,11 (0,89-1,39)	1,31 (0,95-2,08)
False positives (%)	6/76 (7,9)	6/70 (8,5)	11/30 (36,7)

eGFR Estimated Glomerular Filtration Rate, IQR Interquartile range, MM Multiple Myeloma, sFLC Serum Free Light-Chain