Internal fetal monitoring (IFM) involves placing an electrode directly on an unborn baby's scalp through the cervix. Your doctor may use this method to monitor your baby if external fetal monitoring (EFM) isn't working, or if the findings produced by that test are inconclusive or suspicious.
When having this test done, your doctor will administer a vaginal examination. An electrode covered with a plastic sheath will be inserted into your vagina. The guide is moved through the cervix and placed on the fetus' scalp, and then removed. A wire from the inserted electrode is then strapped onto your thigh and attached to an external monitor.