. The science and art of midwifery. ulated didthe error exceed fivedays, a degree of exact-itude unattainable bythe method of Kaegele. The Date of Quick-ening.—When the dateof the last menstrua-tion can not be obtained,it is customary to reck-on the time of laborapproximately by add-ing twenty-two weeks tothe date of quickening,which is assumed to oc-cur in the eighteenthweek of pregnancy. Theextreme variation, how-ever, in the time atwhich quickening oc-curs in different indi-viduals renders thismethod of calculation avery uncertain one. The Size of the Uterus.—As the increase of the uterus i
. The science and art of midwifery. ulated didthe error exceed fivedays, a degree of exact-itude unattainable bythe method of Kaegele. The Date of Quick-ening.—When the dateof the last menstrua-tion can not be obtained,it is customary to reck-on the time of laborapproximately by add-ing twenty-two weeks tothe date of quickening,which is assumed to oc-cur in the eighteenthweek of pregnancy. Theextreme variation, how-ever, in the time atwhich quickening oc-curs in different indi-viduals renders thismethod of calculation avery uncertain one. The Size of the Uterus.—As the increase of the uterus is progres-sive, its size is sometimes used in determining approximatively the * Die Berechnung und die Dauer der Schwangerschaft, Arch. f. Gynaek., , p. 476. In quite a number of instances I have had curious confirmation of Lowen-hardts theory. Thus I can recall two cases where the menses recurred once in twenty-six days, and the apparent length of gestation was two hundred and sixty days. But therule has many Fig. 75.—Schultzc diagram. THE DIAGNOSIS OF PREGNANCY. 119 period to which gestation has advanced. According to a rnde for-mula, commonly employed at the bedside, the uterus is, in the secondmonth, of the size of an orange ; in the third month, of the size of achilds head ; in the fourth month, it can be felt above the symphysispubis. In the fifth month, the fundus of the uterus rises to a pointmidway between the symphysis and the navel. By the sixth month,it reaches the level of the navel. In the seventh month, it should bethe breadth of two to three fingers above the navel. In the eighthmonth, it rises half-way between the navel and the epigastrium. Inthe ninth month, it reaches the epigastrium. In the tenth month,two to three weeks before confinement, the uterus sinks downwardand somewhat forward, so that its upper level corresponds very nearlyto that of the uterus in the eighth month. In the foregoing calculation most of the data are obtained
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