Pregnancy dating criteria

For all Obstetrics scans, no special preparation is needed, although it is best to wear loose clothing that can easily be lifted or removed in order to expose your abdomen.

Anomaly scan and fetal sex determination (20 weeks scan) This scan is a routine scan in the UK which takes place at around 20 weeks.Individual circumstances may dictate that more scans may be offered and a breakdown of what you could receive is detailed below.Early viability scan This usually takes place at 6 to 10 weeks of pregnancy.Although this is usually fairly accurate, it can not be taken as a guarantee of sex as ultrasound is not 100% accurate.This scan is the most significant one undertaken during pregnancy, because it can reassure the parents that everything appears to be as it should be.

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Transvaginal scanning may also be used to obtain a better image of the womb.

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