The levels of a number of chemicals can be measured in a blood sample taken from the mother (at no risk to the baby) that can also be used to assess the risk for Down syndrome. Serum screening is especially useful if the pregnancy is beyond 14 weeks when attending for the nuchal scan or if the results of the scan finding produce a risk that is still high enough to cause anxiety but not high enough to prompt invasive testing (CVS or amniocentesis). The cost of the these blood tests depends on the stage of the pregnancy and the range of chemicals to be analysed.

To book a scan appointment, please telephone the Spire Alexandra Hospital (01634 662863) or complete the online pregnancy scan booking form.