Vision only involves a single blood draw from the mother and is therefore a much safer screening option than amniocentesis or chorionic villus sampling.
To learn more about our diagnostic services and test take a look through our range of articles
Vision offers a safer screening option to invasive methods, making it possible for mothers to gain an insight into their child’s future health without potentially endangering them. Although Vision is a highly accurate screening test (99.79%), it is still possible for false positive and false negative results to occur and therefore invasive testing is recommended to confirm the results.
The first trimester Nuchal Translucency scan only determines the risk of a child developing Down’s syndrome and therefore does not detect whether or not there is an aneuploidy present. Vision tests for this chromosomal aneuploidy.
Our partner laboratory, Genesis Genetics, have genetic counsellors available to aid parents once they receive their Vision results; this can be deciding on the next steps or helping parents affected by the result itself.
The laboratory operates a 9-5, Monday to Friday service, with the exception of bank holidays and festive periods. Notifications of any closures or changes to the working day will be sent well in advance.
The laboratory has a cut off of 5 days. Anything received more than 5 days after the blood draw will not be processed and a re-draw will be required.
One of the limitations of the test is that it is not possible to show which twin the result relates to. In gender identification, a result that shows the Y chromosome has been detected means at least one of the babies is likely to be a male, however it is not possible to determine the individual gender of each baby. Clarification of these results can be obtained from routine ultrasound scans offered later in a pregnancy, as they will also attempt to identify the gender of the babies.
This should not be necessary except in extreme temperatures. Generally the sample should not be exposed to any extreme temperatures because overheating and freezing can both cause haemolysis of the blood. In warmer months or territories, it could be beneficial to use a cool pack, as long as it is not in direct contact with the sample.
No, the blood should be kept at ambient temperature, however it is still important to ensure the blood doesn’t get too hot in the summer months, so a well ventilated area is advised. The laboratory we use stores the samples at 22°C until processing, so we would recommend a similar temperature.
Our test is not constrained by ethnicity, BMI, ART (Assisted Reproductive Technology) or paternal sample.
Help and Advice
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