@SearchingTheSkies and @MsMiaWallace I had this in my last pregnancy, picked up at 36 week scan (that was a different trust to the one I’m with in this pregnancy and they did a routine 36 week scan). Up til then everything had been measuring bang on average so it was a bit of a shock.
They did all sorts of tests - glucose tolerance in case of GD, torch screen blood test and tested for something else I can’t recall the name of. They also had a more detailed look on the scan and said they could see baby swallowing fluid and kidneys looked fine. Anyway I questioned whether it was a problem because I was only JUST above the max threshold that tipped me over into “polyhydramnios”. I asked them how they measured what was too much fluid (apparently there are two ways: measuring the largest quadrant only or taking an average of all 4). They had measured the largest so I asked for them to also do an average of all four. Well when they did that it emerged that the baby was lying right over to one side so the other quadrants had a lot less fluid than they’d expect! Which was enough to set my mind at ease but they did then put me under a consultant because it now said polyhydramnios on my notes.
She wanted to induce me at term and I refused and said i wanted to go to 40+10 (that was their general guideline). I felt deep down that baby was fine and wasn’t worried. All the tests for possible causes came back clear and I saw another much more reasonable (in my opinion) consultant who thought the slightly higher volume of waters was just a variant of normal for me. My own midwife was not concerned either and still maintained I wasn’t measuring too big by fundal height. The only thing they couldn’t rule out was that there could be a problem in baby’s digestive system. So after birth they wanted to take baby for a test which involved passing an Ng tube down her throat and testing giving her some fluid. Now I must note here that this is not necessarily standard at all, I have a friend who is a paediatric Doctor in a different trust and she said they would never have done that in this situation, she said any issues would present themselves very definitely after baby’s first feed anyway.
Looking back I almost wish I had trusted my instincts more but actually I don’t think I could have gone against the hospital’s advise. They did the test after birth and as I knew deep down she was absolutely fine with no issues. She was 7lbs 6oz and born by spontaneous labour at 41+1. They never found the cause.
I hope I haven’t caused more worry by telling you my experiences. I think it’s a very individual thing assessing the risk and whether it’s worrying or not. At least they have flagged it and if there IS a cause they will find it. But if you have niggling doubts I would say do ask lots of questions, get them to take the average of the fluid if they haven’t already, and if they suggest the test like my daughter had after birth I wish I’d have probed them more about what the risks and benefits were (only because they wouldn’t Let me try and feed her until she had had the test, but they were mega busy and she was waiting ages and was sooo angry bless her at being away from me, I think it didn’t help our breastfeeding journey start off very well at all).
Please try not to worry too much and I hope you get more info soon.