Is there anyone who should not consider NIPS?

Yes. Women who have undergone an organ transplant are not good candidates for NIPS. This is because small pieces of the organ donor’s DNA will be screened with the pieces of fetal DNA, giving an inaccurate result. Additionally, women who are currently affected with cancer should not undergo NIPS, since cancer cells often have chromosome differences that may lead to a false positive NIPS result. Finally, women on blood thinners such as Lovanox or Heparin are significantly more likely to have a non-reportable result, and should consider other screening options.