Abstract: A device for identifying a size doubling number of a lesion, having: a planar surface defining a data portion that includes data zones, including: a first zone that defines first zone arcs distributed in a concentric configuration, the first zone arcs defining first mutually unique radii, ranging from a first minimum radius to a first maximum radius; the first zone includes first zone size markers, respectively positioned adjacent ones of the first zone arcs, and the first zone size markers respectively identify the size doubling number of the clinical lesion having a size that corresponds to a respective one of the first zone arcs, the size doubling number being one or more of a volume doubling number, an area doubling number and a radius doubling number.