Table 2. Comparison of Existing Techniques for the Anti-PLA2R Detection.

		detection limit
technique	label	lower (ng/mL)	upper (ng/mL)	sample	assay time (hr)	cost (per instrument or test kit)	ref.
commercial ELISA	yes	0.6	10	buffer or diluted serum 1:100	3.5	inst.: £50k	(55)
						test: £30
fluoroimmunoassay	yes	30	3400	buffer or diluted serum 1:100	3.5	inst.: £50k	(34)
						test: £300
SPR	no	100	>3000	buffer	1	inst.: £200k	(36)
						test: £400
QCM-D (QSense, 5 MHz crystal)	no	500	105 (100 μg/mL)	buffer or concentrated serum	1	inst.: £40–£100k	this work,56
						test kit: £200–£400
C-QCM (10 MHz crystal)	no	100	105 (100 μg/mL)	buffer or concentrated serum	0.5	inst.: £1000	this work
						test kit: £20