We recommend the delivery of two 10 ml blood samples. The first 10 ml blood sample is used for testing, whereas the second sample can be stored as reserve material. For plasma samples the optimal amount is 4 ml. Please note, that with smaller plasma volumes the performance and sensitivity can decrease. Alternatively we accept 15 ng already isolated cell-free DNA (up to 30 µl / concentration > 0,5 ng/µl).