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These measurements are computed automatically in the ultrasound machine’s software.The software has certain measurement scales based on data from large populations, and your baby’s measurements are put into this scale.Evidence: Published literature was retrieved through searches of Pub Med or MEDLINE and The Cochrane Library in 2013 using appropriate controlled vocabulary and key words (gestational age, ultrasound biometry, ultrasound dating).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.Benefits, harms, and costs: Accurate assignment of gestational age may reduce post-dates labour induction and may improve obstetric care through allowing the optimal timing of necessary interventions and the avoidance of unnecessary ones.Ultrasound has become so helpful that obstetricians now refer to the time before it was used routinely as “the olden days.” We use it to diagnose twins early on; we use it to document appropriate growth as the pregnancy progresses; we use it to determine fetal health; and we use it to guide conversion of breech to vertex (head-first) position and to guide amniocentesis.

To determine whether ultrasound gestational age assessment is cost effective.

Grey (unpublished) literature was identified through searching the websites of health technology assessment and health technology-related agencies, clinical practice guideline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.

Values: The quality of evidence in this document was rated using the criteria described in the Report of the Canadian Task Force on Preventive Health Care (Table 1).

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