Recent research about tests for the Zika virus have shown an active infection is harder to detect than originally thought.
As a result, the U.S. Centers for Disease Control and Prevention has issued a new health advisory for women of childbearing age.
The CDC is suggesting that women who may be exposed to the virus because of where they live or where they travel should consider getting a blood test for the Zika antibodies before they get pregnant.
A baseline reading could help with the interpretation of a Zika test during a pregnancy.
The CDC also suggested that pregnant women who may be infected, even if they do not have any symptoms, should be tested at least twice during pregnancy.