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The sex of the fetus may be discerned by ultrasound as early as 11 weeks' gestation. The accuracy is relatively imprecise when attempted early. [15] [16] [17] After 13 weeks' gestation, a high accuracy of between 99% and 100% is possible if the fetus does not display intersex external characteristics. [18]
The gold standard for diagnosing a heterotopic pregnancy is the transvaginal ultrasound. However, the sensitivity of the transvaginal ultrasound for diagnosing a heterotopic pregnancy has been found to range from 26.3% to 92.4%. [5] Therefore, both clinical symptoms and ultrasound imaging are used to make the diagnosis.
The anomaly scan, also sometimes called the anatomy scan, 20-week ultrasound, or level 2 ultrasound, evaluates anatomic structures of the fetus, placenta, and maternal pelvic organs. This scan is an important and common component of routine prenatal care . [ 1 ]
Screening for Down syndrome by a combination of maternal age and thickness of nuchal translucency in the fetus at 11–14 weeks of gestation was introduced in the 1990s. [7] This method identifies about 75% of affected fetuses while screening about 5% of pregnancies. Natural fetal loss after positive diagnosis at 12 weeks is about 30%. [6]
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The NHS Connecting for Health (CFH) agency was part of the UK Department of Health and was formed on 1 April 2005, having replaced the former NHS Information Authority. It was part of the Department of Health Informatics Directorate, with the role to maintain and develop the NHS national IT infrastructure .
ISUOG has a monthly peer-reviewed journal, Ultrasound in Obstetrics & Gynecology.According to the Journal Citation Reports, the journal has a 2020 impact factor of 7.299, ranking it 5th out of 83 journals in the category "Obstetrics & Gynecology". [3]
NHS 24 also acts as the first point of contact for primary care advice in the out-of-hours period. The 2004 Scottish GP contract contained a right for GPs to opt-out of out-of-hours working. [17] By 2006, 80% of Scottish GP practices had exercised this right. From Autumn 2004 patients calling NHS 24 began to experience delays. [18]