Instrumentation Laboratory (IL), founded in 1959, is a worldwide developer, manufacturer and distributor of in vitro diagnostic instruments, related reagents and controls for use primarily in hospitals and independent clinical laboratories.

The company's product lines include critical care systems, hemostasis systems and information management systems. IL's GEM® product offerings, part of the critical care line, include the GEM Premier 4000 and GEM Premier 3000 analyzers with Intelligent Quality Management (iQM®), GEM OPL™, a portable whole blood CO-Oximeter and the GEM PCL Plus, a portable coagulation analyzer. IL's hemostasis portfolio includes the ACL TOP®, a fully automated, high-productivity family of analyzers and the ACL ELITE™ and ELITE PRO analyzers.

IL also offers the HemosIL® line of automated reagents for routine and specialty hemostasis testing. IL is based in Lexington, Massachusetts.