5 Chemical Preparations for use during medical procedures, namely, assessment, testing, or treatment procedures; chemical Preparations for use during veterinary procedures, namely, assessment, testing, or treatment procedures; chemical preparations for imaging blood flow or the vascular system during medical procedures; chemical preparations for imaging tissue perfusion during medical procedures; chemical preparations having fluorescent dyes for use in imaging during medical procedures; chemical preparations for imaging during surgical procedures, namely, chemical preparations having fluorescent dyes; chemical preparations for assessing cardiac and circulatory properties, namely, cardiac output, stroke volume or circulating blood volume; chemical preparations for assessing liver function, namely, liver blood flow and excretory function of the liver; chemical preparations for assessing choroid perfusion