A Cochrane review of antenatal cardiotocography for fetal assessment found no clear evidence that antenatal CTG improves perinatal outcome.
The review included six studies (involving 2105 women). Overall, the included studies were not of high quality, and only two had both adequate randomisation sequence generation and allocation concealment. All studies that were able to be included enrolled only women at increased risk of complications. There was insufficient data to compare antenatal CTG testing begun on fetus less than 37 completed weeks’ gestation versus antenatal CTG testing begun on fetus 37 or more completed weeks’ gestation.