Estimation of Fetal Weight from Symphysis-Fundal Height Measurement
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Abstract
A prospective study of fetal birth weight (FW) estimation from symphysis-fundal height (SFH) tape measurement was made on 177 women within 48 hours of delivery. The SFH measurements were between 25 and 50 cm with the mean of 34 cm (SD=2.85). The FW were between 1500 and 5100 g with the mean of 3082 g (SD=405). Correlation and regression analysis were used by computer. The linea regression equation FW= 101.798(SFH)-384.978 yielded a good correlation coefficient of 0.72 with a standard error of 289.74 g. The simplified equation FW=(SFH-3)x100 could possibly increase the mean error of 23.85g. Using this equation the mean percentage error were 5.7% (SD=4.1) in fetuses between 3000 and 3500g (n=93), 7.5% (SD=5.8) in fetuses between 2500 and 2999g (n=58), 7.9% (SD=5.2) in those larger than 3500g (n=18) and 29.4% (SD=19.5) in those smaller than 2500g (n=8). None of low birth weight baby was found in the group of SFH more than 34cm (n=78), 1.45% in the group between 32 and 34 cm (n=70), 21weight may be reasonably estimated with favourable accuracy using this equation, but the error is too great to be clinically useful for those babies smaller than 2500g. However it seemed that obstetrician should be alert low birth weight low birth weight baby whenever the SFH measurement is under 32 cm.
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