The AU5400 Chemistry System is a random chemistry analyzer. The analyzer is available in versions of 2 or 3 photometric units, including a single or double cell ISE unit. The photometric unit delivers 3200 or 4800 photometric tests/hr and up to 900 or 1800 ISE tests/hr respectively. Depending upon requirement of the test channels, the unit can be configured differently. Real-time configuration can be achieved at anytime with over 99 different analytes. The samples are operated and results generated base on the technology of clot detection and crash prevention. High accuracy is obtained with smallest samples and reagent volumes with state of the art washing stations, serum indices automatic checking and well-established sensitive SPOT photometry. With automatic sample predilution, auto reflex testing and auto repeat procedures time is saved to a large extent.