were added to a headspace vial along with 1 mL of internal standard and approximately 500 mg of NaCl. The standards, samples,and controls were then loaded into the autoinjector for analysis. Each sample was tested in triplicate and averaged for reporting. The limit of detection (LOD) for this method is 5 mg/dL, and the linear range and limits of quantification
(LOQ) are 10–400 mg/dL.