Abstract: The present disclosure is directed to methods and a diagnostic kit for producing pericyte information from a subject for identifying and/or treating a subject condition. In one aspect, a method for identifying a subject condition is provided. The method includes administering intravenously to a subject an effective amount of a solution comprising fluorescent markers to selectively label a plurality of pericytes in the subject's body. The method also includes acquiring fluorescence signals originating from labeled pericytes to produce pericyte information associated with tissues of the subject's body. The method further includes generating a report identifying a subject condition using the pericyte information. In some aspects, a treatment may be adapted using the identified subject condition.