[Prediction of fetal weight by the Johnson-Toshach metod]

Evaluation of Johnson and Toshach method to predict fetal weight. 200 patients with terminal pregnancy. The clinical method of Johnson and Toshach was used to calculate the fetal weight and it was compared with the immediate neonatal weight. Results were analyzed by the t Student test for paired data, with a certainty interval of 95%. The technique was accepted as useful in the cases without significative differences. 150 cases (75%) were in labor. The gestational ages were 38 weeks in 62 case; 39 weeks, 56 case; 40 weeks, 60 cases; 41 weeks, 22 cases. The average fetal weight vs neonatal weight was: At 38 weeks, 3,164 g (DS 289 g) vs 3,218 g (DS 364 g) (p > 0.05); 39 weeks 3,175 g (DS 301 g) vs 3,326 g (DS 391 g) (p < 0.05); 40 weeks 3,281 g (DS 404 g) vs 3,385 g (DS 461 g) (p < 0.05); 41 weeks 3,282 g (DS 308 g) vs 3,298 g (DS 267 g) (p > 0.05). From the cases with significative difference, 85% had labor. The Johnson and Toshach method is useful to predict the fetal weight in patients with terminal pregnancy and no labor.