Blood spots are integral to disease monitoring in PKU, however, there are concerns regarding correlation between capillary and plasma levels and discrepancies arising based on sampling quality and storage. Dr Rachel Carling explains how a volumetric blood collection device presents a cost effective way to improve consistency and reduce rejected samples. 

Investigation of the relationship between phenylalanine in venous plasma and capillary blood using volumetric blood collection devices
Rachel S. Carling, et al
https://doi.org/10.1002/jmd2.12398

Shortcast: Relationship between plasma & capillary blood Phe using volumetric collection devices

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