Table 2.

Measured Aβ_1–40 concentration and relative percentages for each plasma sample through multiple freeze/thaw cycles

	Cycle 0		Cycle 1		Cycle 2		Cycle 3		Cycle 4		Cycle 5		Averaged relative %	CV, %
	concentration	relative %	concentration	relative %	concentration	relative %	concentration	relative %	concentration	relative %	concentration	relative %
Sample 1	60.21	100.00	59.20	98.32	59.86	99.42	59.44	98.72	59.58	98.95	59.00	98.00	98.68	0.7
Sample 2	58.09	100.00	58.72	101.11	58.42	100.56	57.56	99.09	56.88	97.91	55.94	96.30	98.99	1.8
Sample 3	40.75	100.00	39.20	96.20	42.51	104.32	40.18	98.60	39.74	97.52	40.33	98.97	99.12	2.8
Sample 4	43.26	100.00	43.03	99.47	43.52	100.60	42.65	98.59	41.15	95.12	40.58	93.80	97.52	2.9
Sample 5	45.32	100.00	46.02	101.54	46.78	103.22	45.77	100.99	46.51	102.63	46.04	101.59	101.99	1.1
Sample 6	45.5	100.00	46.69	102.62	44.96	98.81	44.64	98.11	43.34	95.25	42.93	94.35	97.83	3.1
Sample 7	42.97	100.00	43.21	100.56	43.85	102.05	43.14	100.40	42.89	99.81	40.30	93.79	99.32	2.9
Sample 8	41.63	100.00	40.92	98.29	41.81	100.43	41.48	99.64	41.07	98.65	41.67	100.10	99.42	0.9
Mean ± SD		100.0+0.000		99.79±2.10		101.17±1.88		99.27±1.00		98.23±2.44		97.11+3.01	−	−

Aβ_{1–<smallcaps>40</smallcaps>} concentrations are presented as pg/mL. SD, standard deviation; CV, coefficient of variation.