How accurate is the Harmony Prenatal Test?

Using a DNA-based technology, the Harmony Prenatal Test has been shown to identify greater than 99% of trisomy 21 (Down syndrome) cases.1 By comparison, traditional blood tests can miss as many as 15% of cases in pregnant women.2

Accuracy for trisomy 13 and 18 is similar but these conditions are rarer and positive predictive values are therefore lower.

Harmony is also much less likely than traditional tests to give you a false-positive result, meaning there is much less chance your doctor would recommend follow-up invasive testing, such as amniocentesis.

Harmony Prenatal Test is a screening test. Results should be confirmed with diagnostic testing.