![]() Urine fortified with LSD and stored in amber glass or nontransparent polyethylene containers showed no change in concentration under any light conditions. After 4 weeks of incubation, a 30% loss in LSD concentration at 37 degrees C and up to a 40% at 45 degrees C were observed. These studies demonstrated no significant loss in LSD concentration at 25 degrees C for up to 4 weeks. Thermostability studies were conducted in the dark with various containers. ![]() Good correlation was observed between the immunoassay and the fluorescent integrity of the LSD molecule. ![]() LSD concentrations were measured quantitatively by the Abuscreen RIA and by HPLC using a fluorescence detection method. The concentrations of LSD in urine samples were followed over time at various temperatures, in different types of storage containers, at various exposures to different wavelengths of light, and at varying pH values. A controlled study was undertaken to determine the stability of LSD in pooled urine samples.
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