In this VetGirl blog, we interview Dr. Søren R. Boysen, DACVECC, Associate Professor at University of Calgary on his recent study on "Effects of rapid intravenous 100% L-isomer Lactated Ringer's administration of plasma lactate concentrations in healthy dogs" published in JVECC (2014). In this blog, we find out the whether or not the "L" in LRS is potentially detrimental when used to fluid resuscitate veterinary patients in the emergency room who may have a lactic acidosis. More importantly, we review the differences between d- and l-lactate, and whether or not LRS should still be one of the favorite fluids of emergency clinicians and criticalists (Yes, VetGirl likes it). We also briefly review the use of the handheld Accutrend lactate devices, and what we're measuring with these devices. Finally, we review the importance of lactate when evaluating patients with gastric-dilatation voluvulus (GDV) and whether or not LRS can be used in these situations!