Category Archives: fetal doppler

What is a Fetal Monitor?

Purpose

A fetal monitor is a machine used to monitor the condition of the fetus by simultaneously measuring and recording:

  • Fetal Heart Rate (FHR)
  • Fetal Movement (FM)
  • Uterine Contractions (UC)

Parameters

Fetal Heart Rate (FHR)

FHR is detected by using an ultrasound transducer. The movement of the fetal heart affects the frequency of the reflected ultrasound. FHR is calculated from this reflected ultrasound and is usually used to monitor the oxygen delivery status.

Uterine Activity (UA)

UA is detected by a TOCO transducer which contains a pressure sensor. UA is used to monitor the interval, period, and intensity of uterine contraction. UA may be called UC (Uterine Contraction)

Fetal Movement (FM)

FM is detected by an ultrasound transducer. The movement of the fetus’ body affects the frequency of the reflected ultrasound. FM is calculated from this reflected ultrasound and usually used to evaluate fetus status during NST (Non-Stress Test)