Level 1 Scanning

 A Level 1 scan, also known as a Nuchal Translucency (NT) scan, is a prenatal ultrasound performed between 11 and 14 weeks of pregnancy. It's primarily used to assess the risk of certain chromosomal abnormalities, such as Down syndrome. The scan measures the thickness of the nuchal translucency, a fluid-filled space at the back of the baby's neck, and may also examine the fetal nasal bone and heart rate. 

Purpose and Procedure:

Risk Assessment: The NT scan helps estimate the risk of chromosomal abnormalities like Down syndrome, Edwards syndrome (trisomy 18), and Trisomy 13. 
Measurement: The scan measures the thickness of the nuchal translucency (the fluid-filled space at the back of the baby's neck). 
Other Assessments: The scan may also assess the fetal nasal bone and heart rate. 

Normal vs. Increased Nuchal Translucency: 

Normal:
A nuchal translucency measurement of less than 3.5 mm is generally considered normal.
Increased:
A measurement of 3.5 mm or more may indicate an increased risk of chromosomal abnormalities, and further testing may be recommended. 

Note: The NT scan is a screening tool, not a diagnostic test. If the measurement is increased, further testing, such as chorionic villus sampling (CVS) or amniocentesis, may be recommended to determine if there is a chromosomal abnormality. 

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