Table 2. Assay precision and analytical recovery of PSA added to two serum samples from healthy males.

Added (ng mL–1)	Found (ng mL–1)	CV (%) n = 4	Recovery (%)
Sample 1	2.99	3.57	—
2.50	5.65	3.98	106.51
3.00	5.78	2.13	93.24
12.00	15.87	1.06	107.36
Sample 2	1.83	5.09	—
1.00	2.81	7.36	98.17
7.00	9.01	2.88	102.59
28.00	27.76	2.03	92.60