Table 5.

Recovery from serum and urine samples.

Conc. (ng/mL)	Serum		Urine
	Piracetam	Levetiracetam	Piracetam	Levetiracetam
	%Recovery	%Recovery	%Recovery	%Recovery
20	97.6	96.8	98.74	97.59
50	97.9	97.4	99.26	98.37
100	99.2	98.8	98.05	98.14
1000	99.3	98.6	100.14	99.18
5000	97.4	96.9	99.93	97.33
10000	99.74	99.84	99.77	99.27