AL-Amyloidosis Presenting with Negative Congo Red Staining in the Setting of High Clinical Suspicion: A Case Report

Table 1

Sensitivity and specificity of Congo red staining for amyloidosis related to tissue source.

	Sensitivity (%)	Specificity (%)	Reference
Bone marrow	63		[2]
Kidney, liver, cardiac	87–98		[2]
Rectal	69–97		[3]
Fat-pad needle biopsy	58	100	Guy and Jones cited in [4]
	55	75	Ansari-lari and Ali cited in [4]
	80	100	Hazenberg et al. cited in [4]
	78	93	Dhingra et al. cited in [4]
	80–85		[2]
	>90 increased exam		[2]
	19 (22 gauge)		[5]
Computer assisted	75	100	[4]
Fat-pad biopsy	73	90	[6]