“… 20 Furthermore, paper‐based ionization techniques such as paper spray ionization (PSI) for MS have enabled the direct analysis of a broad spectrum of analytes in dried microsamples without the requirement of any prior sample pretreatment. 21 These sophisticated approaches have driven the implementation of microsampling in various biomedical domains; newborn and metabolic screening, 22 , 23 biomarker research, 21 , 24 , 25 pharmacokinetic (PK) and pharmacodynamic (PD) studies, 26 , 27 therapeutic drug monitoring (TDM), 28 , 29 , 30 , 31 , 32 , 33 forensic toxicology, 34 , 35 , 36 sports anti‐doping, 37 , 38 , 39 metabolomics 22 , 40 , 41 and proteomics. 24 , 42 , 43 Since 70% of medical decisions are governed by diagnostic blood tests, 44 several medical technology companies are investing in the development of innovative at‐home blood microsampling devices to make blood work more accessible and convenient.…”