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The length of pregnancy: An echographic reappraisal
Author(s) -
Todros Tullia,
Ronco Guglielmo,
Lombardo Daniela,
Gagliardi Leone
Publication year - 1991
Publication title -
journal of clinical ultrasound
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.272
H-Index - 61
eISSN - 1097-0096
pISSN - 0091-2751
DOI - 10.1002/jcu.1870190104
Subject(s) - medicine , pregnancy , crown rump length , obstetrics , ultrasound , population , gestation , gynecology , fetus , radiology , first trimester , genetics , environmental health , biology
A study of 998 pregnant women was conducted to estimate the random errors in dating pregnancy by menstrual history and by ultrasound measurements of the fetus (crown–rump length or biparietal diameter before 20 weeks, menstrual age) as well as the biological variability of pregnancy length. The latter was found to be 7.74 days. The random errors made when dating pregnancy by menstrual history and by ultrasound measurements were 7.16 days and 4.26 days, respectively. (All variabilities are expressed as standard deviations). The differences between the two methods were mainly attributable to some large errors occurring when dating pregnancy on the basis of menstrual history. Differences between methods of more than 10 days were observed in about 10% of our population. When the two methods were used on the same patients to define a pregnancy as preterm, at term, or postterm, discrepancies were found in about 7% of cases.