Reduced Fetal Movements
A 32-year-old primigravida at 36 weeks of gestation reports that fetal movements have been noticeably reduced for the past 24 hours. Blood pressure is 118/72 mm Hg, symphysis-fundal height is 34 cm, and the fetus is cephalic. She has no bleeding, contractions, or leaking fluid. Which of the following is the most appropriate initial investigation?
- A.Fetal kick chart over 24 hours
- B.Umbilical artery Doppler velocimetry
- C.Cardiotocography as a non-stress testCorrect
- D.Complete biophysical profile scoring
Explanation
Reduced fetal movement is a recognized warning sign of fetal compromise and is associated with stillbirth, fetal growth restriction, and placental insufficiency, so it always requires same-day assessment rather than reassurance. After confirming the fetal heart is present with a handheld Doppler and taking a history and blood pressure, the first investigation is cardiotocography performed as a non-stress test. It is immediately available, non-invasive, and gives real-time information on baseline rate, variability, accelerations, decelerations, and uterine activity, which together reflect current fetal oxygenation and autonomic function. A reactive trace is strongly reassuring and allows the woman to go home with advice to return if movements reduce again. If the trace is non-reactive or shows decelerations or reduced variability, escalate to ultrasound for amniotic fluid volume, estimated fetal weight, and umbilical artery Doppler, or to a full biophysical profile, and consider delivery. Kick charts are a home screening tool used before presentation and have no role once the woman has already reported reduced movements; formal counting studies have not shown a reduction in stillbirth. Doppler and biophysical profile are valuable second-line tests but are slower, operator-dependent, and not the immediate bedside step. Ultrasound for growth is also indicated if this is a recurrent episode or if the symphysis-fundal height is small for dates.
Why each option
- A.
- Kick charts are a home screening tool and are redundant once the woman has already presented with reduced movements; they delay definitive assessment.
- B.
- Umbilical artery Doppler is a useful second-line test for placental insufficiency but is not the immediate bedside assessment of fetal wellbeing.
- C.
- Correct. Cardiotocography gives immediate real-time information on fetal heart rate pattern and variability and is the first-line test for reduced fetal movements.
- D.
- A biophysical profile is more time-consuming and requires ultrasound expertise; it is used when the cardiotocograph is non-reassuring.
Reference: RCOG Green-top Guideline No. 57, Reduced Fetal Movements, 2011; UpToDate 2025, Decreased fetal movement
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