61 LC-MS/MS-method development quantifying FVIII Table 5. Matrix effect, each sample spiked at 3 different concentration levels. Sample Spike [ng/mL] Expected [ng/mL] Measured [ng/mL] Recovery [%] # 1 290 564.8 570.5 101.0 145 419.8 431.7 102.8 72.5 347.3 351.2 101.1 0 274.8 274.8 100.0 # 2 290 543.2 521.2 96.0 145 398.2 395.7 99.4 72.5 325.7 325.3 99.9 0 253.2 253.2 100.0 # 3 290 578.8 551.1 95.2 145 433.8 421.9 97.2 72.5 361.3 346.7 95.9 0 288.8 288.8 100.0 3
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