[Reference values for progesterone, beta-HCG, estriol and human placental lactogen in the 10th-16th weeks of...

Progesterone, beta-hCG, estriol and hPL in sera from 745 pregnant women have been measured in weeks 10 to 16 of pregnancy. The determined reference intervalls included the 10th and 90th percentile. All confidence intervalls have been calculated for a probability level of 10 per cent. The following levels were determined during the concerning weeks of pregnancy: progesterone 32-165 nmol/l, beta-hCG 31.5-260 micrograms/l, estriol 0.04-4.94 nmol l, and hPL 0.03-2.65 mg/l. The levels of progesterone are increasing weakly with the rising weeks of pregnancy, but the levels of beta-hCG are going down continuously. The levels estriol and hPL are showing a marked growth.