A diagnostic test tests with 100% accuracy and tells you whether a certain condition is present or not. The major disadvantage of prenatal diagnostic methods, such as amniocentesis, is that they carry the risk of miscarriage. Screening tests indicate the risk of having a chromosomal condition, and while highly accurate, they do not test with a 100% accuracy. NIPT by GenePlanet is a screening test, so despite a very high sensitivity (99.02%) for the detection of Down syndrome, Edwards syndrome, and Patau syndrome, it is not a diagnostic test. NIPT by GenePlanet's main advantage over a diagnostic test is that it is 100% safe for both the mother and the fetus.