A nuchal translucency ultrasound (commonly called a ânuchal scanâ or âNT scanâ) is an ultrasound performed between 11.5 and 13 weeks 6 days gestation. It is usually part of an assessment called combined first trimester screening.he nuchal translucency is the fluid found at the back of your babyâs head and neck, just beneath the skin. The thickness of this fluid can be precisely measured and this is called the nuchal translucency (or NT) measurement.
Weather in Porto in September. The average maximum daytime temperature in Porto in September is a warm 24Â°C (75Â°F). There are usually 8 hours of bright sunshine each day, which represents 60% of the 12 hours of daylight. The average sea temperature in and around Porto in September is 18Â°C (64Â°F). Expect 62mm (2.4 inches) of rainfall across the whole of September with 8 days with some rain falling. Maximum UV levels will be high (6 UV index) at midday when the skies are clear.
July is the hottest month in Lisbon with an average temperature of 24Â°C (74Â°F) and the coldest is January at 11Â°C (52Â°F) with the most daily sunshine hours at 12 in July.The wettest month is November with an average of 127.6mm of rain.The best month to swim in the sea is in September when the average sea temperature is 20Â°C (68Â°F).he wettest month is November with an average of 127.6mm of rain. The best month to swim in the sea is in September when the average sea temperature is 20Â°C (68Â°F).