Context.-Laboratory information systems (LIS) are critical components of the operation of clinical laboratories. However, the functionalities of LIS have lagged significantly behind the capacities of current hardware and software technologies, while the complexity of the information produced by clinical laboratories has been increasing over time and will soon undergo rapid expansion with the use of new, high-throughput and high-dimensionality laboratory tests. In the broadest sense, LIS are essential to manage the flow of information between health care providers, patients, and laboratories and should be designed to optimize not only laboratory operations but also personalized clinical care.Objective.-To list suggestions for designing LIS with the goal of optimizing the operation of clinical laboratories while improving clinical care by intelligent management of laboratory information.Data Sources.-Literature review, interviews with laboratory users, and personal experience and opinion.Conclusions.-Laboratory information systems can improve laboratory operations and improve patient care. S ince the 1970s, laboratory information systems (LIS) have been critical components of the operation of clinical laboratories. They were initially developed to collect, record, present, organize, and archive laboratory results, often with a focus on generating information for proper financial management of the laboratory. While information technology in general is advancing at an increasingly faster rate, particularly in the hardware domain but also in software development, LIS have not evolved correspondingly. For example, the current LIS make very limited use of artificial intelligence approaches such as neural 1 or Bayesian 2 networks, fuzzy logic, 3 genetic algorithms, 4 and artificial immune recognition systems.5 Health care systems in general can be characterized as conservative and resistant to change and current health care information systems (HIS) and LIS are a reflection of this conservative approach. Despite the potential benefits in cost-efficiency and patient care improvements possible with well-designed HIS/LIS, most of these systems lag significantly behind the possibilities afforded by current information technology. In fact, some of these systems have deficiencies that most homeand Web-based software have long overcome, such as efficient navigation, rapid response, and spelling correction.Modern clinical laboratories are purveyors of information, in the form of laboratory results, which may be numbers, text, graphs, or other images, together with interpretative data, to assist health care providers in delivering optimal patient care. The complexity of the information produced by clinical laboratories has been increasing over time, and with the advent of large-scale analytic techniques, such as microarrays and next-generation sequencing, the amount of data produced will rapidly grow by several orders of magnitude. Advanced developments in data management and bioinformatics will need to be incorporated into LIS ...