Disclosed is a sample element for holding a volume of bodily fluid drawn from the skin of a patient at a withdrawal site. The sample element comprises a housing defining a sample chamber therein, and a barrier. The barrier has a first side configured to contact the skin of the patient at the withdrawal...http://www.google.ca/patents/US20050038357?utm_source=gb-gplus-sharePatent US20050038357 - Sample element with barrier material
