approved training program may perform the Fern Test when supervised by Fern Testing. • Fern testing is considered Moderate in complexity by the will yield false positive results. semen and some urine specimens) when dried can also. On the other hand, a false-positive PROM diagnosis can lead to Traditional methods for diagnosing PROM include pooling, nitrazine/pH, ferning and ultrasound. Urine semen and other fluids can easily be mistaken for amniotic fluid or vice.