Hello, previous results on previous posts. Had my levo increased by 25 to 150mcg 5 weeks ago. This was done based on my t3 which was low 3.2 (3.5-6.5) . It was checked this week has dropped to 3.0 despite the increase in levo. My GP said it was due to the Sertaline as that can cause it, but l have just looked at my t3 since 2014 and it has only been within range 3 times and has been tested a lot as I have had 2 pregnancies. I have been on Sertaline since Oct for alleged PND. Does my T3 level need investigating further?