Define effect on Human placental lactogen in pregnancy?

Human placental lactogen, with a structure similar to the growth hormone, increases throughout pregnancy. Its rate of production parallels the rate of placental growth and is a good indicator of placental function. At the peak rate of secretion, the amount produced is 1-2 g per day, much higher than any other hormone. Placental lactogen stimulates lipolysis and is important in maintaining allow of substrates to the foetus. Placental lactogen along with prolactin also promotes the development of mammary glands. After delivery, placental lactogen disappears from the maternal circulation.