Lysis efficiency (A) evaluated by reporting the number of cells lysed (percentage of original contents) for blood samples. Error bars are the estimated standard deviation over three samples. Diluted whole blood was processed for different volumes and different dilutions. It should be noted that the y axis is broken to show the results for 5 μL droplets of blood diluted 20 times (45%). (B–C) Absorbance of diluted blood samples (B, 540 nm—C, 414 nm), lysed chemically with Triton X-100 (squares, solid line) and using SAW (disks, dashed line). Droplets of 20 μL were processed on the SAW device for different dilutions of whole blood samples (B), and as a function of power for a 1∶50 diluted blood sample (dilution factor 0.02) (C). The SAW excitation was applied for 10 s.