CIRCULATING LEVELS OF PREGNANCY‐SPECIFIC β1GLYCOPROTEIN AND HUMAN PLACENTAL LACTOGEN IN THE THIRD TRIMESTER OF PREGNANCY: THEIR RELATIONSHIP TO PARITY, BIRTH WEIGHT, AND PLACENTAL WEIGHT

Abstract
Circulating levels of pregnancy-specific beta1-glycoprotein (SP1) and human placental lactogen (HPL) were measured in 153 normal subjects during the third trimester of pregnancy. The levels of SP1 and HPL showed a skewed distribution and rose progressively to reach a plateau by the 36th week. The normal range was calculated by ranking the data and division into centiles as well as by logarithmic transformation of the values. A low but significant correlation was observed between SP1 and HPL levels, SP1 and birth weight. There was also a correlation between HPL levels and placental weight.

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