I'm not sure where the best place to post this is, or if anyone will have any insight, but I'm hoping for some thoughts...
First, I'm a Type 1 diabetic, so I have had a more medical pregnancy than I would like, but I feel much of it is justified. I am well-controlled on a pump and my blood sugars are generally in the range of a non-diabetic.
Also, I am planning and HBAC, but have a back-up Dr. that is aware of my plans and doing my parallel care so that it's easier for me to have u/s, NSTs, etc.
I'm 38+3 (yes, we're sure of dates) and have been having prodromal labor non-stop for 6 days.
Due to the medical side of things, I've had several u/s that indicate that the baby has one moderately to severely enlarged kidney and ureter. His bladder and stomach are both normal in size and my AFI is always pretty much right in the middle of the normal range.
However, at my last u/s on Tuesday I ended up with a really bizarre report - the kind that makes you understand why no one trusts u/s at all. He was estimated in the 65-85% in most things - head circ, femur length, etc. But, his abdominal circ was off-the-charts. From what I've read, 35cm is considered macrosomic in most circumstances, but this one read 43cm. The tech didn't really believe it and measured several times. This unfortunately led me to have a piece of paper in my chart estimating a currently 11.5 pound baby.
Now, none of us (u/s tech, Dr, MW, me, or husband) actually believe he's 11.5 lbs, but we are expecting a reasonably sized baby both from palpation and the fact that my son was 9'2" at 40w. And, 43cm is definitely way larger than even the estimated range of error of u/s measurements.
Now, if you've read through all my background, congrats! My actual question is if anyone is aware of possible birth defects/conditions that would lead to such a disconnect between abdominal circ and the other measurements? Especially in light of the known kidney defect. I don't really want to ask my back-up Dr. because his support for my HBAC is starting to wane (and he was genuinely supportive until this) and I fear this will just give him an excuse to further encourage me to head to the hospital. My MW doesn't really have any experience to know. But, if my child is in danger, I'd definitely not be foolish enough to want to birth him at home. My google-fu hasn't brought anything up that really seems relevant. I guess my concern is some sort of possible fluid overload in the periteneum or something similar.
Thoughts, support, words of wisdom?