Common "T3 And T4 Levels" queries answered by top doctors | iCliniq

T3 And T4 Levels

T3 (Triiodothyronine) and T4 (Thyroxine) are hormones produced by the thyroid gland. The average level of T3 is 80 to 180 ng/dL, and T4 is 4 to 12 ug/dL. Increase or decrease in this levels causes metabolic disorders like hypothyroidism and hyperthyroidism.

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Can I double the dose of Levothyroxine until I see a doctor?

Query: Hello doctor, I got my lab results recently. I have an appointment with the thyroid doctor in a week. I am afraid of going to the ER plus I have muscle spasms, body jerks, and confusion. Two days ago, I took a double levothyroxine dose of 125 mcg. Yesterday, I added 5 mcg synthetic T3, maybe a secon...  Read Full »


Dr. Shaikh Sadaf

Answer: Hello, Welcome to icliniq.com. I just read your query and from what you have mentioned it appears that you have hypothyroidism. I suggest that you take tablet Levothyroxine 50 mcg once daily keeping in mind your age and based on your weight and lab results. Consult your specialist doctor, ...  Read Full »

Can my low T4 levels affect my baby's brain development?

Query: Hi doctor, I am five weeks pregnant now. Currently, my T3 is 1.05 ng/mL, T4 is 5.0 μg/dL, TSH is 27.62 μIU/mL. I started Thyronorm 75 mcg today. What if my T4 was low from the past five weeks? Has it affected my baby already? Will it affect the baby's brain development?  Read Full »


Dr. Shaikh Sadaf

Answer: Hello, Welcome to icliniq.com. I just read your query about your thyroid function test results, and it appears that you have hypothyroidism. I would like to say that even if you were diagnosed at five weeks, it does not cause brain damage to your baby so quickly. Besides, your T4 and T3 are still ...  Read Full »

I suffer from anxiety and OCD. Is it due to increase in FT3 level?

Query: Hello doctor, I suffered from terrible anxiety and OCD that seems to come and go over time. My mother had exactly the same disorder like myself. She was diagnosed with an under active thyroid and autoimmune thyroid issue. On taking medication to sort her levels she has been free from the mental heal...  Read Full »


Dr. Shaikh Sadaf

Answer: Hello, Welcome to icliniq.com. I just read your query and from what you have mentioned it appears that you have sub-clinical hyperthyroidism and the FT3 here does not seem to be high enough to be causing the symptoms that you have mentioned so rest assured on that front as of now. This condition d...  Read Full »

I have thyroid nodules. Should I undergo surgery?

Query: Hello doctor, I am a 41 year old male. My weight is 196 lbs and height is 6 feet. I have nodules in the thyroid gland since last two years. Initially, it started as a feeling of imbalance in the head about two years back. The initial assumption was vertigo and later it was found to be a small nodul...  Read Full »


Dr. Divakara. P

Answer: Hi, Welcome to icliniq.com. Basically, your scan reports (attachment removed to protect patient identity) are showing that you have thyroiditis (inflammation of the thyroid gland) along with a nodule in the thyroid gland. Because of this problem you are having the symptoms. Initially,you had hyperth...  Read Full »

Is there necessity for treatment of borderline TSH and T4 levels in a newborn?

Query: Hello doctor, My son is 42 days old. His activities are normal, but his TSH level is 5.6 miu /ml and laboratory normal range is 4 to 8 miu/ml and his total T4 level is 8.6 mcg/dl and my laboratory normal level is, 4- to miu /ml. My doctor says that he is in borderline and needs treatment as the co...  Read Full »


Dr. Nagasirisha Naredla

Answer: Hello, Welcome to icliniq.com. TSH of 5.6 is high normal and T4 of 8.6 is fine. If this is the first time you are checking it, repeat after five days, do a free T3, free T4, and TSH next time. They are better interpreters. Correlation between the hormone levels seems to be fine. The condition whi...  Read Full »

Why are my T3 and T4 levels high if not pregnant?

Query: Hello doctor,I recently had my thyroid test done. I am attaching the reports of the same. The note reads that a physiological rise in total T3 and T4 levels are seen in pregnancy and patients on steroids. Does it mean that I am pregnant? I am worried, as I am unmarried and have never had sex before.  Read Full »


Dr. Sagar Ramesh Makode

Answer: Hello, Welcome to icliniq.com. I have seen your reports (attachment removed to protect patient identity). Your thyroid profile is entirely normal and it is not at all suggestive of pregnancy, so stop worrying about it. This amount of variation is acceptable. The note you read, just says that if som...  Read Full »

I have low TSH levels. Will taking Propylthiouracil help?

Query: Hello doctor,Seven years back, I had done my thyroid profile. My TSH (thyroid-stimulating hormone) levels were low at 0.005 mU/L, free T3 (tri-iodothyronine) 4.45 pg/mL, and free T4 (thyroxine) 1.83 ng/dL. I have no symptoms of any hyperthyroidism, and I feel fine. I did my thyroid scan with a 99m T...  Read Full »


Dr. Shaikh Sadaf

Answer: Hello, Welcome to icliniq.com. I have read the query, and I can understand your concern. You have sub-clinical hyperthyroidism since neither your T3 nor T4 levels are increased. You said you do not having any hyperthyroidism symptoms, like a rapid heartbeat, weight loss, irregular periods, etc. ...  Read Full »

My TSH value is high whereas my T3 and T4 values are normal. What could be the reason?

Query: Hello doctor, I am a 44-year-old male with 5ft 4" in height and 152 lbs weight. My TSH (9.83) value is high, but T3 total (104.6) and T4 total (8.5) are normal. No medications are other than Uprise-D3 60 K capsule, which I take weekly. I have no particular symptoms but no weight loss in spite of ver...  Read Full »


Dr. Kaushal Bhavsar

Answer: Hello, Welcome to icliniq.com. I can understand your concern. I have gone through the reports you have attached. In my opinion, you should get done repeat test after a month.No need to start thyroid medicines. Do regular aerobic exercise like running, cycling, swimming, or walking. I hope I have s...  Read Full »

What is the treatment for my high T3 and T4 levels?

Query: Hello doctor, According to the lab report which was taken a week before TSH level is normal but T3 and T4 level is mildly increased. Please suggest will I be cured with medicine or without medicine. Currently, I am under medication for a chocolate cyst (Dienogest 2 mg).  Read Full »


Dr. Shaikh Sadaf

Answer: Hello, Welcome to icliniq.com. I have just read your query, and from what you have mentioned, it appears that you have a normal thyroid function test results. The slightly high T3 and T4 are not a thing to worry because they can be caused by other hormonal medicine that you are taking for your cho...  Read Full »

Can increased TSH levels harm the baby's brain growth?

Query: Hi doctor, I am 26 years old. My height is 5 feet inch and weight is 115.5 lbs. I am 20 weeks pregnant now. I underwent a surgery for complete thyroidectomy and I am taking Thyroxin 100 mcg regularly. In my first trimester, the TSH level was 0.31 and the doctor advised me to continue the same dosa...  Read Full »


Dr. Swaraj Waddankeri

Answer: Hi, Welcome to icliniq.com TSH (thyroid stimulating hormone) is very important for the baby's brain growth as rightly said by you. Therefore, it is imperative that we treat aggressively. Target TSH in the first trimester is 0.3 - 2.5 mIU/L and therefore the doctor did not change the treatment. I ho...  Read Full »

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