Welcome Help Please log in to determine if you are eligible to purchase PT Programs. NON-INVASIVE PRENATAL TESTING - NIPT Analyte Challenges per Shipment Number of Shipments Cell-free DNA screening for fetal aneuploidy 3 Two shipments per year Noninvasive prenatal testing is an exercise and is not considered proficiency testing. This exercise may be used to meet the requirements for alternative assessment. Program Information Three maternal plasma samples Shipping Schedule Shipment A: April 29 Shipment B: December 1 Guest Log in/Register