the ca b level was almost the same as the control level , 13.5 +/- 1.7 mg/g hb , in the first trimester , then slightly but significantly increased from the middle of the second trimester ( p less than 0.02 ) , reached the maximum , 17.2 +/- 2.6 mg/g hb ( p less than 0.001 ) , in the last of the pregnancy , and reduced slightly in the puerperium .
C0032980
second trimester
C0032961
pregnancy