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New lab results and don't understand why Triiodothyronine

Here goes: Been on .25 mg of Levothyroxin and vitamin D3  for the past 5 weeks for Hashi's and vitamin D3 deficiency.  I'm glad I started to see an endo because I have been trying to get a diagnosis for 2 years now.  I kind of knew I had Hashi's with the help of this forum and research. I go for labs every 6 to 8 weeks but this time he did different labs which I don't really understand ie: Triiodothyronine, Free, Serum.

Thyroxine (T4) Free, Direct, S, T4, Free (Direct) 1.33  Range - 0.82 - 1.77
TSH 1.99 Range 0.450 - 4.500
Vitamin D, 25-Hydroxy 32.4 Range 30.00 - 100.0
Triiodothyronine, Free, Serum 2.7 Range 2.0 - 4.4

Your input would be very helpful.  Thank You!!!! :)
Best Answer
Avatar universal
Triiodithyronine, Free is free T3 (FT3).  It's good that they ran that; they should be ordering it every time you have labs.  Your FT4 looks great; it's just above midrange.  However, your FT3 is on the low side.  Rule of thumb for FT3 is upper half to upper third of range, and yours is down in the bottom third.  Do you still have hypo symptoms?

Not all hypothyroidism is caused by Hashi's.  Some people are hypo for other reasons and some for indeterminate reasons.  Typically, Hashi's comes first.  You develop the antibodies, which then destroy thyroid function making you hypo.  
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Avatar universal
Thank you for answering my questions. At least now when I go see endo I will have some knowledge when speaking to him.
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Avatar universal
You might take a wait and see approach.  Often, FT3 takes a while to come up once FT4 is good (which yours is right now).  Total symptom relief can lag both of those.  You're right, low vitamin D just adds to that...many people find that D has to be much higher in the range than yours is now.

"Do u feel a person with hashi's should stay on meds when thier levels are within good range? ."

Your current levels reflect a MEDICATED state.  You have to realize that if you went off meds, your levels would go right back to where they were before you started meds.  Also, FT3 and FT4 ranges are very flawed for a number of reasons.  Therefore, FT4 often has to be midrange amd FT3 upper half to third of range before all symptoms are relieved.  So, yes, it's absolutely essential to stay on meds if you want to feel well.  And, it's absolutely essential to keep increasing meds until ALL symptoms are relieved.  
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Avatar universal
Yes I'm still having symptoms but not as bad as before I started taking levo which has been 5 weeks. I'm sure the vitamin d3 is helping a lot as well. I'm kind of worried because I'm having trouble swallowing lately and I'm getting frequent soar throats. I have asthma as well and I have been getting shortness of breath. I see my endo on the 20th and I will let him know. Do u feel a person with hashi's should stay on meds when thier levels are within good range?
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Avatar universal
I also want to know if it's possible to have hypothyroidism and than get hashi's after.  I thought that Hashi's is the disease and hypothyroidism is a condition that comes after hashi's.  
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