The overall purpose of this study is to demonstrate the usability of a clinical-grade device in the form of a finger clasp similar to a pulse oximeter for monitoring lactate values, by comparing its performance in reading interstitial fluid lactate values against a known clinical standard in the form of venous lactate levels. Serum lactate measurements are used clinically as a measure of end-organ dysfunction and physiologic stress. Changes in lactate may indicate worsening infection in the setting of sepsis, drug toxicity for certain xenobiotics, or exercise tolerance in exercise physiology. Serum lactate cutoffs have been developed for various disease states and trigger a variety of medical decisions directed at managing the course of the disease. A common theme in the application of lactate measurements to understanding changes in physiology is the need to obtain venous blood to determine lactate. While point-of-care assays have been developed that improve the processing speed, there continues to be a need to obtain fingerstick blood or in most cases, venous blood. Obtaining venous blood for serum lactate requires an individual with phlebotomy skills, the processing capabilities of a laboratory to determine lactate concentrations, or the availability of point of care technology. An alternative method to measure lactate is to sample interstitial fluid which surrounds cells and tissues in the body. Obtaining interstitial fluid is potentially less invasive without the need for repeat phlebotomy or the presence of an indwelling intravenous catheter which can become complicated by infection. The analysis of interstitial fluid for glucose has been validated and is clinically utilized in continuous glucose monitors in individuals with diabetes. In this investigation, the investigators will utilize a novel device, the Lab Clasp to obtain interstitial fluid in a noninvasive method. The Lab Clasp is manufactured to resemble a finger pulse oximeter with additional onboard microfluidics channels that obtain a lactate concentration from interstitial fluid. This streamlined process of obtaining the point of care lactate measurements on demand allows for tasks like serial lactate measurements to be accomplished on a reliable schedule with less workload for nursing staff typically required to draw venous blood. Additionally, the portable and noninvasive nature of the Lab Clasp system may render it usable in facilities that lack skilled staff necessary to perform phlebotomy.
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Comparison of average difference lactate readings between Lab Clasp and laboratory reference values.
Timeframe: 150 minutes