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The size of the uterus is traditionally described via comparison with its size at different stages of pregnancy.
The size of a uterus can be ascertained via bimanual palpation. A non-pregnant uterus is described as plum-sized; 6 week pregnant uterus as egg-sized; 8 week uterus as the size of a small orange; a 10 week uterus is the size of a large orange.
After 12 weeks of pregnancy the fundus of the uterus is palpable above the symphysis pubis. It reaches the umbilicus by the 20-22 weeks, and finally ceases to ascend at 36-38th week (uterine fundus at about the level of the xiphisternum).