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 Searches were updated on a regular basis and incorporated in the guideline to July 31, 2013.Grey (unpublished) literature was identified through searching the websites of health technology assessment and health technology-related agencies, clinical practice guideline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.

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(Note that you can also select None in the Treatment cycle window if there is no associated treatment cycle).

The scan can be carried out and the data recorded in a similar fashion as that shown below.

The Gestation (wks/days) will update once the date of the scan has been entered.

Outcomes: To determine whether ultrasound dating provides more accurate gestational age assessment than menstrual dating with or without the use of ultrasound.

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.

To determine whether ultrasound gestational age assessment is cost effective.

If the luteal day zero date is missing, the gestational age will be calculated from the LMP (Follicular phase day one).

Fetal heart beats, CR length, NT (mm) and BPD (mm) can be entered for each fetus in the right hand table.

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Objective: To assist clinicians in assigning gestational age based on ultrasound biometry.