(Closed) BBT – how low is too low?

posted 6 years ago in TTC
Post # 3
1141 posts
Bumble bee
  • Wedding: January 2010

i don’t have a medical answer to your question, but I hover between 96.35 and 96.8 pre-o, and I was just tested by my OB for hypo- and hyper-thyroidism because of my crazy cycles and it came back negative.

However, I am now on CD 22 with no temp spike, so I’m probably not the best person to be answering this quesiton…

Post # 4
1285 posts
Bumble bee
  • Wedding: October 2011

My BBT can get pretty low as well (regularly in the 97 range, but I’ve been 95-96 before). I have discussed with my doctor, nurse, etc and I have never been told it is a problem. I’ve also tested my thyroid and it was fine. I assumed it is because I am on the thin and active side and when my temp does reach up to the 98.6, my body gets achy like I have a fever.

Just be sure you taking before you even get out of bed in the morning.

Post # 6
2854 posts
Sugar bee
  • Wedding: September 2012

@starrynight:  I have a pretty high average BBT so have no first-hand experience of this. Are you temping vaginally or orally? If you’re temping orally your temps will automatically be a smidge lower than if you were to temp vaginally. Also…if you are temping orally AND you are a mouth-breather while sleeping, then this will also lower your temps. So having a low average BBT does not necessarily mean that your temps are low, it COULD mean that the way you are temping is not indicative of your actual BBT because of a few different factors. I’d recommend testing that theory tomorrow morning by temping orally immediately upon waking, then temping vaginally directly afterwards (while, of course, trying to move as little as possible). If your BBT IS generally low though and it’s NOT because of how you’re temping, then I still wouldn’t worry. From what I’ve read and seen, it doesn’t necessarily matter how low your temps are pre-O, as long as you get a good thermal shift post-O. And since the temps you stated above don’t seem to be THAT low (they’re low, but not abormal I don’t think), I’d say you have nothing to worry about. You should come join us on the Charters thread…..I’ve been on there 6 months and am still learning new things from the other ladies there. 😀

Post # 7
319 posts
Helper bee
  • Wedding: December 2013

When I was temping I was getting 95-96 range and thought the same thing. I was tested twice for hypothyroidism and it came back negative both times. So if you want to get tested and have more symptoms, go ahead! But it doesn’t always mean you have it.

Post # 8
9139 posts
Buzzing Beekeeper
  • Wedding: November 2013 - St. Augustine Beach, FL

@starrynight:  Anything under 96.8 could cause problems and you should probably get it checked out.  Have you checked the low temp gallery on fertility friend?  That might give you a better idea of what you should be seeing.

Post # 10
136 posts
Blushing bee
  • Wedding: July 2011

Ive always had a low temp. My normal before O is 96.1-96.3, even after i O the very highest it normally goes is still in the 97 range. Ive been tested for hypo and hyperthyroidism and many other hormonal test and all come back normal. The doctors have never seem alarmed but if i dont get pregnant soon I may have them do more tests or something. Good luck!

Post # 11
7770 posts
Bumble Beekeeper
  • Wedding: July 2010

@starrynight:  Darling, there is nothing to worry about.  My BBT is 96 flat and Darling Husband got me first time 🙂  (Due in June!)  That being said, I am hypothyroid and that was my temp even on medication.  I do not see a problem with knowing your tsh level, however.  But, when I found out I was hypothyroid, it was a major thing I could not ignore and I went into the urgent care to get help.  In other words, the signs were much more drastic.  PM me if you want more info.

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