Question: can negative ffn test be wrong?
Answer: Of the 373 women with a negative fFN test 10 (2.7%) delivered within 7 days and had a false-negative result. Twenty-one out of 708 fFN tests (2.9%) were uninterpretable. The association of specific factors with false-positive, false-negative, and uninterpretable results is presented in the table.