"performed at 9w-13w6d (ideally 9-12w)"
"For screening validity, the test must be performed at 11w3d to 13w6d, or when CRL measures 45-84 mm (if there is a discrepancy, CRL takes precedence)."
"For screening validity, the test must be performed at 11w3d to 13w6d, or when CRL measures 45-84 mm (if there is a discrepancy, CRL takes precedence)."
"A second-trimester fetal morphology ultrasound scan is generally performed at 18-20 weeks. It is not recommended as the primary screening tool for trisomy 21 or trisomy 18, although it can be used as primary screening for neural tube defects 3."
"1st trimester: as part of the combined serum screening"
"for combined serum screening, a risk of 1 in 300 or less is considered as increased risk"
"measures free βhCG and PAPP-A"
"NOTE: This article is in accordance with the Australian/New Zealand and UK antenatal screening guidelines. We recognise that some regional variation in the availability and timing of antenatal screening exists."
"NOTE: This article is in accordance with the Australian/New Zealand and UK antenatal screening guidelines. We recognise that some regional variation in the availability and timing of antenatal screening exists."
"NOTE: This article is in accordance with the Australian/New Zealand and UK antenatal screening guidelines. We recognise that some regional variation in the availability and timing of antenatal screening exists."
Expected headings
"Screening"
"Maternal serum screening"
"First-trimester ultrasound"
"Second-trimester ultrasound"
"Non-invasive prenatal testing (NIPT)"
";"
"Initial guidelines recommended NIPT for high-risk women only; however, it is now also available to the general population."
"Its availability is limited by cost. Furthermore, NIPT screens only for specific chromosomal abnormalities: trisomy 21, 18, and 13, with or without monosomy X (Turner syndrome). Therefore, it should be performed alongside 1st trimester ultrasound for detection of other anomalies."