The XN-3100 has a single point of entry and a single point of exit. Reflex testing occurs within the same loop, and before samples pass the SP-50 module. Sample racks are then sent to the SP-50 module where the samples needing a smear are removed. Like extended measurements, smears are only initiated if they offer additional diagnostic value. The analysis profile is extended automatically to include smear-making and staining, but you may also order this up front, for instance with known special samples.