Diagnostic Accuracy of Direct Immunofluorescence Test on Paraffin-Embedded Blocks in Comparison with Frozen Section Blocks in Renal Biopsies

Table 7

Comparison of immunofluorescence intensity on fresh frozen and paraffin-embedded renal biopsies.

Disease	Number of cases with no difference in intensity of diagnostic immunoglobulin/complement (%) IF-F = IF-P	Number of cases with the difference in intensity of diagnostic immunoglobulin/complement (%) IF-F > IF-P		Total number of cases
		Difference of 1+	Difference of 2+
Membranous nephropathy	22 (84.6%)	4 (15.3%)	—	26
Lupus nephritis	11 (61%)	7 (38%)	—	18
IgA nephropathy	4 (57.1%)	2 (28.5%)	1 (14.2%)	7

IF-F: Immunofluorescence on fresh frozen tissue: IF-P: Immunofluorescence on paraffin-embedded tissue.