Can thyroid function tests be done while fasting?
Good day and Welcome back
Sorry for the delay in reply. I was away in the country side today.
Glad to know that the thyroid function tests was normal.
The thyroid function tests will be bette if done in the morning before taking the medicine or 4 hours after taking the medicine. But if you are doing only TSH, it can be done anytime. TSH levels tend to be little on higher side by late evening and i advice my patients to get the TSH done before 5 pm.
I guess the saliva test your cardilogist want is "midnight salivary cortisol"
No need of fasting for thyroid test
You can take light breakfast before Thyroid blood test. That is not a problem.
But of course, if you also doing other tests like fasting blood glucose or lipids, it has to be a fasting sample.
I guess the saliva test is a cortisol test.
The first one concerns melatonin. I heard if you have thyroid disease you should not take it because it's a hormone. Is that true?
The second question, is it helpful or harmful to supplement with nutrients such as kelp. I have read conflicting information about this.
No worries. It is a pleasure to answer queries.
I do agree that if you search internet, you may get conflicting results . As far as health information is concerened, please trust information only from FDA, XXXXXXX Thyroid association, British Thyroid association or similar authorities. There are information for general public in theoe websites. Many naturopathy sites also can be misleading and confusing.
Melatonin does have inhibitory action on thyroid gland. It may also interfere with thyroid hormones. However, small doses for insomnia for a brief period would not cause major problems. Please go through the following website from mayo clinic.
Regarding Kelp, it has iodine content and may cause hyperthyroidism. However, since your thyroid is dyfunctional, it doesnt really matter much. ( because, your thyroid gland probably is not capable to trap and process iodine now due to aut immune destruction). Please go through following website from british thyroid association. It is really helpful.
I hope i have answered your question. Once the thyroid gland is destroyed by auto immunity, hypothyroidism develops. After the complete destruction of the gland, hardly any hormone is secreted from it and diet supplements may not really help further to regenerate the gland ( despite numerous claims from naturopathy websites).
Your body will try to attack and destroy thyroid tissues in Hashimoto's disease. This is due to auto immune disease. However. auto immune disease can be self limiting and the destruction of gland depends on the amount of auto immunity body produced. If you have ever done an Anti TPO ( anti thyroid peroxidase), that may give some clue. If the levels are very high, that may indicate a robust auto immune process and likely that the gland is destroyed by auto immunity. This is very common, especially amongst women after child birth
However, not to worry. This is a common disease and easy to treat. Anyways, you are taking Thyroid hormone replacement and that way the gland's deficiency is being taken care of.
Please do not hesitate to ask questions. I enjoy answering them. I might take some time based on my clinic timings and patient load that's all. You are not bothering me at all.
You need to understand little bit about Thyroid auto immune disease ( HAshimoto's disease). Auto immune thyroid disease is due to the immune attack against thyroid by the body. In some people, body's immune system some how consider thyroid cells as a foreign object and mount an attack against it. This is carried out by white blood cells called as lymphocytes and other immune cells.
To put it in simple terms, this is a war against body and thyroid. If the body wins, thyroid tissue will be destroyed.
After the immune attack, initially thyroid will produce small amount of hormones and we will have to supplement the deficient part only. Auto immune attack cmay stop spontaneously and in few lucky people, thyroid will recover partially or fully. But in the vast majority, the immune attack will continue episodically until thyroid is fully destroyed and eventually no hormone will be produced. At this stage, we have to supplement with the full replacement dose.
This process happen over months to years. In women, they are vulnerable for this auto immune attack after pregnancy is over.
I know this is tough to understand. But please do not hesitate to ask further if want clarifications.
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