Table 2.

Determination of CA19-9 in real samples ^a.

Sample	Added (mU/mL)	Found (mU/mL)	Recovery (%)	RSD (%)
Serum a	0.100	0.0950	95.0	0.36
	1.00	1.10	110	0.50
	1000	952	95.2	1.3

^a: 50-time diluted with PBS (0.01 M, pH = 7.4).