Medical diagnostic kits composed primarily of medical diagnostic reagents, medical antigens, cotton sticks for medical purposes, medical adhesive tape, bandages for dressings and also containing plastic storage receptacles for transport of samples, and printed materials in the nature of instructions and mailing envelope for testing the presence of medical conditions and levels of substances, namely, infectious and post-infectious diseases and disorders, autoimmune diseases and disorders, gastrointestinal diseases and disorders, viral diseases and disorders, neuropathic diseases and disorders, cognitive diseases and disorders, pulmonary diseases and disorders, respiratory diseases and disorders, allergies, coagulopathy and vasculopathy diseases and disorders, mental health diseases and disorders, pain disorders, mitochondrial diseases and disorders, cardiopulmonary diseases and disorders, connective tissue diseases and disorders, sleep and circadian diseases and disorders, endocrine and metabolic diseases and disorders, and longevity and aging diseases and disorders; screening kits composed of medical diagnostic reagents and assays for testing of bodily fluids for use in detection of infectious and post-infectious diseases and disorders, autoimmune diseases and disorders, gastrointestinal diseases and disorders, viral diseases and disorders, neuropathic diseases and disorders, cognitive diseases and disorders, pulmonary diseases and disorders, respiratory diseases and disorders, allergies, coagulopathy and vasculopathy diseases and disorders, mental health diseases and disorders, pain disorders, mitochondrial diseases and disorders, cardiopulmonary diseases and disorders, connective tissue diseases and disorders, sleep and circadian diseases and disorders, endocrine and metabolic diseases and disorders, and longevity and aging diseases and disorders