Does a positive blood test for Down syndrome mean my baby will be born with it?

Too sensitive a. Question. It is not clear what you mean by blood test. If it is a screening test, then you need to get additional tests, like amniocentesis done for a definitive answer. Please discuss the matter with your doctor and i wish you and your baby the best.
Which test ????????? The answer depends on what test was done.
High chance. Positive screening should be confirmed by karyotyping of fetal cells obtained through amniocentesis. Consult your obstetrician for further details.

Related Questions

Has any one had the blood test positive for Down syndrome but then ultrasound showed the baby fine?

Great question. Amniocentesis takes a fluid sample and looks at foetal chromosomes. Down's demonstrates trisomy 21; edwards syndrome, trisomy 18. Others too. An u/s tells nothing about chromosomes, and there is not a contradiction of one test by the other. The chromsome changes are not artifacts. If you do not want to know, do not get the test. Every couple needs to make their own choice; it's no one else's. Read more...
Accuracy matters. The ultrasound is a screening test, and as such may over or underestimate the presence of what is being looked for. Accuracy is often dependent on the training of the tech and or who reads the study.The blood test is a definitive test, it is either positive or not.I would never rely on the ultrasound for any decision other than pushing me to order the blood test . Read more...

How to know if the baby is Down syndrome or mosaic down without blood test?

Difficult issue. Prior to the availability of chromosome(chm) and chm banding studies, these kids were usually classified by physical features.Errors happened occasionally.Many features are quite consistent among DS kids, yet they are also found occasionally in normal kids & some DS kids have few if any typical features.Separating the regular DS from a mosaic is impossible without testing. Read more...
Why do you ask? You're going to need labs to determine this. Please forgive my frankness. Having a child with possible Down's is an extremely serious business and anyone who would trivialize this by saying, "Let's skip the labs that will establish the diagnosis" is doing both the child and the family a grave disservice. Read more...