1.- editorial. 2.-Circle of time: errors in the use of the pregnancy wheel. 2.- The effect of clinical charecteristcs on the lecithin / Shingomyeling ratio and lamellar body count: a cross sectional study. 3.- Cocaine decreases urinary prostacyclin release in pregnancy: correlation with uterine and umbilical doppler velocimetry. 4.- Electrical impedance measurements: an objetive measure of prelaborcervical change. 5.- fetal erythroblast in matrenal blood in relation to gestional age. 6.- Screening and prevention of congenital toxoplasmosis: an effectiveness study in population with a high infection rate. 7.- Is antibody screening in Rh (D) positive pregnant women necessary?

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