Obstetric dating and assessment

by  |  03-Mar-2016 13:15

Results were restricted to systematic reviews, randomized control trials/controlled clinical trials, and observational studies written in English. Searches were updated on a regular basis and incorporated in the guideline to July 31, 2013.

Grey (unpublished) literature was identified through searching the websites of health technology assessment and health technology-related agencies, clinical practice guideline collections, clinical trial registries, and national and international medical specialty societies.

During the scan we examine each part of the fetal body, determine the position of the placenta, assess the amount of amniotic fluid, and measure fetal growth.

Obstetric dating and assessment

Obstetric gestational age was correlated with masked and unmasked score. For this study, best obstetric estimate of gestational age was determined by last menstrual period if no ultrasound was available.

Statistical analysis used Spearman rank correlation test, plotting the measurement means against the measurement differences, χ = 0.84–0.86) between obstetric gestational age estimates (33.3 ± 3.0 weeks) and the gestational age derived from masked (34.3 ± 3.0 weeks) and unmasked (34.0 ± 3.0 weeks) Ballard scores. Eighty percent of women had ultrasound done in the first or second trimester.

To provide maternity health care providers and researchers with evidence-based guidelines for the assignment of gestational age.

To determine which ultrasound biometric parameters are superior when gestational age is uncertain.

The dating and viability scan is an ultrasound examination amd is usually carried out between 6-10 weeks of pregnancy.

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