We have developed a microsystem based technology that offers a solution for near-patient blood sampling e.g. at home. Patients can themselves conveniently leave blood samples (as dried blod spots) and send it by mail to a laboratory for analysis. This is possible through our new disposable sampling chip that can meter and store an exact blood volume which allows for quantitative measurements, something that so far not has been possible. This is of particular importance for patients requiring continuous therapeutic drug monitoring. Our technology will reduce the need to travel and healthcare resources spent on taking blood samples. We address a major growing market where only in Sweden more than a million therapeutic drug monitoring samples are taken each year.