Table 3

Salmeterol

α‑hydroxysalmeterol

Urine limit of quantification

0.12 ngmL^-1

0.14 ngmL^-1

Urine intermediate precision (level 1)

10 % (0.20 ngmL^-1)

12 % (0.50 ngmL^-1)

Urine intermediate precision (level 2)

11 % (1 ngmL^-1)

10 % (5 ngmL^-1)

Recovery (Level 1)

88 % (0.2 ngmL^-1)

62 % (0.5 ngmL^-1)

Recovery (Level 2)

73 % (1 ngmL^-1)

73 % (5 ngmL^-1)

Serum limit of quantification

0.04 ngmL^-1

0.05 ngmL^-1

Serum intermediate precision (0.025 ngmL^-1)

13 %

18 %

Serum intermediate precision (0.20 ngmL^-1)

5 %

22 %

Serum intermediate precision (1 ngmL^-1)

4 %

16 %

Recovery (0.025 ngmL^-1)

97 %

87 %

Recovery (0.2 ngmL^-1)

78 %

98 %

Recovery (1 ngmL^-1)

56 %

83 %