J Med Assoc Thai 2001; 84 (4):520

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Short Fetal Acoustic Stimulation Test for Rapid Antepartum Assessment of Fetal Well-Being
Tannirandom Y Mail, Kittipibul V

Short fetal acoustic stimulation test (FAST) was prospectively studied in 604 high risk
pregnancies after 28 weeks of gestation. Fetal heart rates were recorded 3 minutes before and 5
minutes after fetal acoustic stimulation. The results of the tests performed within a week of deli-
very were compared with perinatal outcomes. Reactive response to short FAST occurred in 597
cases (98.8%) while nonreactive response was found in 7 cases (1.2%). Nine fetuses were consi-
dered poor outcomes. The sensitivity, specificity, positive predictive value, negative predictive
value and accuracy of short FAST to predict poor fetal outcomes were 66.7, 99.8, 85.7, 99.5,
and 99.3 per cent, respectively.
Short FAST has high specificity, negative predictive value and accuracy for prediction
of poor perinatal outcome. This rapid test should be used as a screening method for antepartum
assessment of fetal well-being in a busy antenatal clinic.
Key word
: Fetal Acoustic Stimulation, Antepartum Assessment, Fetal Well-Being

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