Blood irradiation therapy could be a procedure within which the blood is exposed to low level red light (often optical maser light) for therapeutic reasons. Blood irradiation therapy can be administered in three ways. Extracorporeally, drawing blood out and irradiating it in a very special cuvette. This method is employed for the ultraviolet (UV) blood irradiation (UVBI) by UV lamps. The laser light is monochromatic, i.e. it's such a wavelength that permits you to bring light into the optical fibre and carry out irradiation intravenously through a catheter in a vein. This methodology is additional simple and effective. Blood irradiation therapy is additionally administered externally through the skin on the projection of large blood vessels.