Alfa-fetoproteína sérica materna: determinación de los valores medios normales en mujeres embarazadas costarricenses / Maternal seric alpha-fetoprotein: determination of the normal middle values in Costa Rican pregnant women

The present study focuses on the normal mean values of AFP in 124 Costa Rican pregnant women. In these women, 554 determinations were done between the 15th and 20th week of gestation. For this purpose, an IRMA test was used and normal values were stablished. The concentration values of AFP were expressed as multiples of the median, considering a value of 2.5 MM as th normal superior limit and of 0.25 as th inferior limit. The confidence limits of the median were 25-57 KU/1 and the 2.5MM value was located between 60-143 KU/1