Curious about TSH and T4 blood readings
So, I have a family history of various thyroid issues (including my whole female lineage on my mom’s side having goiters and ultimately getting cancer). I have some symptoms that could point to hypothyroidism and my recent TSH reading was over 4. My doctor agree it could be a good idea to start me on low dose synthroid.
However, a year ago my TSH reading was 2.5 and free T4 was 11 (pmol/L). Whole neither was technically out of range at that time, the T4 seems like it was out of range according to how many other labs measure. Is it common for T4 to be that low with a “fairly normal” TSH reading?
They didn’t take my free T4 this time, so I don’t actually know if I am subclinical or clinical. Given my TSH is considerably higher, would it follow that my free T4 also likely dropped out of range?
I am now on meds and will get a full panel in 6-8 weeks, but of course it will be impacted by the meds. I guess I am just curious whether I am typical subclinical, or could actually be clinical.