The method of the invention for measuring positions and dimensions of vaginal prolapses is carried out with the use of a vaginal speculum having at least one removable with a scale. Measurements are carried out by manipulating the pivotally connected parts and the removable blade by inserting the moveable blade into the vagina of a female patient until contact with the reference point, e.g., the top of the cervix, and reading the number on the scale for determining the distance L1 from the reference point to the top of the cervix. The speculum is then withdrawn in a direction away from the cervix and expanded by rotating the pivotal parts for exposing the wall of the vagina on the side of the completely removable blade for observation. The exposed prolapse is evaluated with regard to its severity. The removable blade is shifted to the tip of the prolapse, and the distance L2 from the reference point to the tip of the prolapse is determined with the use of the scale. Position of the prolapse is then determined by subtracting L2 from L1.