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Revista Cubana de Obstetricia y Ginecología

On-line version ISSN 1561-3062


FERREIRO, Ricardo Manuel  and  VALDES AMADOR, Lemay. Effectiveness of different echography formulas to estimate the term fetal weight. Rev Cubana Obstet Ginecol [online]. 2010, vol.36, n.4, pp. 490-501. ISSN 1561-3062.

The weight for gestational age is the statistical variable more associated with perinatal mortality. OBJECTIVE: To identify the different formulas for fetal weight estimation in the term pregnancy. METHODS: A randomized, descriptive and prospective study was conducted in 88 pregnant between 38 and 45 weeks seen in the term consultation of Ramón González Coro" Gynecology-Obstetrics Hospital from May to June, 2007 underwent biometry tests according to the proposed techniques by Hadlock and Campbell to estimate the fetal weight by ultrasound (US) using four logarithm regressive equations seven days before the birth comparing it with the weight birth A absolute and relative frequency analysis was made as well as mean and standard deviation (SD),mean comparisons and indicators to assess the formulae effectiveness. RESULTS: Pregnant mean was of 40.4 weeks, newborn weight was of 3 540 g, amniotic fluid rate was of 12.2 and a echography five days before birth. Campbell's formula was the more effectiveness with a difference of 29.75 g with relation to the newborn weight, a sensitivity of 91.3 %, a specificity of 68.4 %, a positive predictive value of 91.6 % and a negative predictive value of 68.4 %. CONCLUSIONS: The Campbell's formula has the great sensitivity as well as positive and negative predictive values but with the lowest specificity compared with that of Hadlock. It is recommended the fetal weight estimation only when backgrounds, course and physical examination considered it necessary.

Keywords : Echography; weight estimation; term pregnancy.

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