I will be 39 weeks on Thursday, and my Dr. wants to check for lung maturity so that they can induce me that day. (this is due to my elevated TSH and free T4 - thyroid). My question is: Does anyone think that an aminocentesis at this late gestation ( full term) by all means is unneccessary? I thought that most woman delivery full term babies between 38 to 40 weeks anyway?