Routine ultrasound dating has not been shown to be more accurate than the calendar method

Olsen, Ole; Clausen, Jette Aaroe

doi:10.1111/j.1471-0528.1997.tb10965.x

Cited by 35 publications

(26 citation statements)

References 6 publications

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“…The average error in the predicted due date with ultrasonography was 7.96 days, and with DLM it was 8.63 days-a difference of less than 1 day between the methods. Other studies show essentially no difference in the accuracy of the methods (Olsen & Clausen, 1998). In this latter study, DLM predicted on average 3.3 days earlier than actual delivery and ultrasonography predicted 2.0 days after actual delivery.…”

Section: Measurement Of Visual Orientingmentioning

confidence: 43%

Variations in birth weight within the normal range are related to visual orienting in infancy for boys but not for girls

Dannemiller

2004

Infant Behavior and Development

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Pooling across 27 experiments on visual orienting during early infancy generated a large sample of full-term infants with birth weights greater than 2500 g (N = 944). A weight-for-date measure was obtained separately for girls and for boys by residualizing birth weight on gestational age at birth. The proportion of trials with orienting toward a moving target increased directly with this weight-for-date measure for boys but not for girls in a linear regression with adjustments for gestational age at testing, birth order and visual stimulus parameters across experiments. The same relations held when raw birth weight was used as a predictor. For the 475 boys, the z-score of the orienting measure increased by 0.221 for each kilogram increase in birth weight corrected for gestational age (0.196 z-units per kilogram adjusted for covariates, 95% CI = 0.04-0.35 z-units per kg, P = 0.014). The interaction of gender and birth weight in this association makes explanations based on confounding family social variables less tenable as explanations. This association primarily for boys is similar to recently reported associations between birth weight and IQ during childhood. Possible factors underlying this association such as prenatal nutrition are discussed.

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Section: Measurement Of Visual Orientingmentioning

confidence: 43%

Variations in birth weight within the normal range are related to visual orienting in infancy for boys but not for girls

Dannemiller

2004

Infant Behavior and Development

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“…[6,7] With most of the obstetricians relying on ultrasound for gestational age, some researchers have even suggested to do away with Naegele's rule, [8] but still the academic value of this rule prevails.…”

Section: Introductionmentioning

confidence: 98%

Erroneous calculation of the expected date of delivery by medical professionals

Parikh¹,

Pandia²

2011

Chron Young Sci

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Background: Naegele's rule, which is used to estimate the expected date of delivery (EDD), presumes that the subject is menstruating regularly every 28 days. For subjects with lengthier or shorter cycles, correction is needed while calculating the EDD. A majority of medical professionals are unaware of this and succumb to errors. The author has published Parikh's formula as an alternative that does not require any additional correction. This study was aimed at evaluating awareness among medical professionals regarding the importance of menstrual history and utility of Parikh's formula in minimizing errors. Materials and Methods: One twenty-six medical students and interns from four medical colleges in India and 24 medical officers from a primary health center were enrolled for the study. A questionnaire with a history of a woman with a regular cycle of 35 days was distributed to each participant and they were asked to calculate the EDD. Participants were then educated on Parikh's formula and asked to calculate the EDD again by using that formula. Results: Only 10 (6.66%) of 150 participants calculated the EDD correctly by using their conventional methods. After explaining Parikh's formula, this proportion raised to 99%, i.e., 147 of 150 participants, the difference being statistically significant at P<0.05. Conclusion: A majority of students, interns, and medical officers are unaware of the importance of previous menstrual history while calculating the EDD. If Parikh's formula is used, errors in calculating the EDD can be reduced significantly.

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“…Because up to 40% of women are uncertain of their menstrual dates or ovulation may not exactly correspond with the mid menstrual cycle 2 . Gestational age based on the last menstrual period is subject to both random error and a systematic error 3 .…”

Section: Introductionmentioning

confidence: 99%

Pregnancy dating – why, when and how

Dias

2012

Sri Lanka J Obstet & Gynae

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Routine ultrasound dating has not been shown to be more accurate than the calendar method

Cited by 35 publications

References 6 publications

Variations in birth weight within the normal range are related to visual orienting in infancy for boys but not for girls

Variations in birth weight within the normal range are related to visual orienting in infancy for boys but not for girls

Erroneous calculation of the expected date of delivery by medical professionals

Pregnancy dating – why, when and how

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