The rule of thumb for FT4 is that it should be around midrange (50%), and yours is at 18%, so quite low. Rule of thumb for FT3 is upper half to upper third of range. Your FT3 looks good. TSH is high, indicating that your pituitary thinks your levels are too low.
With your low FT4 level, you'd probably benefit from meds. Has your doctor suggested treating you?
I'm not sure i understand what you mean by TSH levels fluctuating for the test. TSH tests are quite accurate, but TSH levels fluctuate considerably. Results can change by as much as 70% just with the time of day the blood was drawn.
Your FT4 is low, and that's consistent with your high TSH. However, your FT3 level looks good, which is not consistent.
The Content on this Site is presented in a summary fashion, and is intended to be used for educational and entertainment purposes only. It is not intended to be and should not be interpreted as medical advice or a diagnosis of any health or fitness problem, condition or disease; or a recommendation for a specific test, doctor, care provider, procedure, treatment plan, product, or course of action. MedHelp is not a medical or healthcare provider and your use of this Site does not create a doctor / patient relationship. We disclaim all responsibility for the professional qualifications and licensing of, and services provided by, any physician or other health providers posting on or otherwise referred to on this Site and/or any Third Party Site. Never disregard the medical advice of your physician or health professional, or delay in seeking such advice, because of something you read on this Site. We offer this Site AS IS and without any warranties. By using this Site you agree to the following Terms and Conditions. If you think you may have a medical emergency, call your physician or 911 immediately.