Pregnant women now have access to a new blood test called “cell free fetal DNA testing” that can be used to screen the DNA of a fetus for chromosomal problems. Just like all medical practices, there are some advantages and disadvantages to this new procedure. The appeal of this blood test is that it is less invasive than an amniocentesis, which removes cells from a fetus using a needle and adds a small risk for miscarriage. The downside is that despite the increased convenience of this new method, a follow up amniocentesis can sometimes be recommended because it is still the most definitive diagnostic tool if a problem is found.
Comments
Concluding remarks
You might want to add a couple concluding sentences to wrap up your paragraph instead of ending on just the downsides of the new blood test.
Instead of stating "the
Instead of stating "the downside is" try to be more fluid, just state that a follow up is still needed if problems are found
comment
Maybe you could add more information about how the advantages and disadvantages would affect the lives of humans.