Girls, on the 1st screen, the protein in blood RARR-A of 0.36 should b…

Girls, on the 1st screen, the protein in blood RARR-A of 0.36 should be from 0.5-2.5 They said to do the method as it's called through the anus basically you need to take blood from the child and check chromosomes for Down syndrome. Has anyone had this? What would you suggest? Or still do other tests ??? To the son is one year old now, just now 13 weeks taking.