St. George's University of London evaluates the Mitra microsampling device for sampling accuracy and precision and concludes it is better than 10 μL blood plasma pipetting.
Resources
http://cdn2.hubspot.net/hubfs/1806452/Neoteryx_July_2016/PDF_Files/Evaluation_of_Mitra_for_PKPD_Study_of_Beta-lactams.pdf