The Effect of Acute Lysine Administration on α-aminoadipic Acid (Sub-study)

Carbon-13 is a stable naturally occurring heavy isotope of carbon. Inclusion of a 13C label on lysine allows for subsequent differentiation between endogenous and exogenous lysine and 2-AAA for calculation of clearance and excretion of the lysine bolus.

Because patients will have multiple blood draws during the course of the study, subjects will have an IV placed to reduce the number of needle sticks. To keep the vein open for blood collections, we will infuse Normal (0.9%) Saline (NS) at a rate of approximately 10ml/hr in order to keep the line open.