Endoscopes are well known devices used for examining surfaces contained within an enclosed cavity. Typical applications for these devices are the examination of tissues within human body cavities or mechanical components contained within engine compartments. An endoscopic apparatus for measuring blood flow contained within an enclosed body cavity is claimed. Such apparatus comprises an electromagnetic radiation source for emitting a coherent beam, an optical relay system for propagating the beam down an endoscopic probe to illuminate a target within an enclosed cavity, an endoscopic optical relay system for capturing the reflected light and transmitting an image of the illuminated region onto the surface of a two-dimensional image sensor, an analog to digital conversion device for capturing analog output signals from the image sensor for conversion to digital format, a display device for immediate visual display of captured images, a method for calculating flow values from a captured digital image containing speckle structure information of the laser illuminated surface, a memory device for storing digital blood flow images, and a display device for immediate visual display of color coded, blood flow images.