a method used to calculate the estimated date of delivery: nine months and seven days are added to the date of the start of the last menstrual period. A correction is required if the woman does not have 28-day menstrual cycles. [F. K. Naegele (1777–1851), German obstetrician]
a method for quickly assessing the area of the body covered by burns in order to assist calculation of the amount of intravenous fluid to be given. The body is divided into areas of skin comprising approximately 9% each of the total body surface. These are as follows: each arm = 9%, the head = 9%, each leg = 18%, the back of the torso (including the buttocks) = 18%, the front of the torso = 18%, with the external genitalia making up the final 1%. The rule is not applicable to children, whose body proportions change with age (in younger children the head represents a greater proportion of the total body surface area).... rule of nines
the relationship of the upper and lower parts of a two-part kidney with two ureters and their drainage into the bladder. It states that the upper ureter inserts lower and more medially into the bladder in contrast to the lower ureter, which inserts higher and more laterally into the bladder. [C. Weigert (1845–1904), German pathologist; R. Meyer (1864–1947), German physician]... weigart–meyer rule
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