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Doctor insights on: Can Estrogen Effect The Accuracy Tsh With Reflex Test

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Dr. Quang Nguyen
952 doctors shared insights

Thyroid Stimulating Hormone (Definition)

A TSH test measures the amount of thyroid stimulating hormone (TSH) in your blood. TSH is produced by the pituitary gland and tells the thyroid gland to make and release the hormones thyroxine ...Read more


Dr. Alvin Lin Dr. Lin
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What is the risk associated with suppressing fsh/lh when using hCG to increase testosterone in men?

Dr. Alvin Lin Dr. Lin
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What is the risk associated with  suppressing fsh/lh when using hCG to increase testosterone in men?

Minimal: Let's put it this way: using any type of t to replace/fix hypogonadism/andropause will also suppress fsh/lh. But more importantly, taking t will shut down testicular function from lack of fsh/lh. Using HCG to stimulate the testes to produce more t & sperm will result in negative feedback @ pituitary, thus suppress lh/fsh. But at least your testes are functioning fully. It's off-label but it works. ...Read more

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Which of the following accurately predicts problems with cortisol levels blood test, 24 hr urine or midnight saliva swab?

Which of the following accurately predicts problems with cortisol levels blood test, 24 hr urine or midnight saliva swab?

Depends: Blood cortisol is useful in the diagnosis of cushings (hypercortisolemia) or adrenal insufficiency. A 24 hr urine cortisol is helpful to diagnose excess cortisol. Saliva cortisol is only helpful in diagnosing excess cortisol, not adrenal insufficiency. If a blood cortisol level is low, further evaluation is required to establish if your adrenal function is truly low. ...Read more

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Controversy surrounds those patients with a suppressed tsh. Isn't it true that when a hypothyroid patient starts taking exogenous th, a negative feedback system reduces the pituitary gland's output of tsh. This decreases the thyroid gland's output of en

Controversy surrounds those patients with a suppressed tsh.  Isn't it true that when a hypothyroid patient starts taking exogenous th, a negative feedback system reduces the pituitary gland's output of tsh.  This decreases the thyroid gland's output of en

Endo feedback: With primary hypothyroidism, TSH is elevated in an effort to push the thyroid gland to make more thyroxine. Treatment with levothyroxine indeed signals the pituitary to reduce TSH output. Secondary is when either/or pituitary +/- hypothalamus is damaged but unable to produce tsh. Then, thyroxine levels drop but the pituitary can't respond. Tsh can't monitor treatment but free T4 levels can. ...Read more

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Can irregular cycles have an impact on the amount of hCG released and therefore cause a false negative pregnancy test?

Can irregular cycles have an impact on the amount of hCG released and therefore cause a false negative pregnancy test?

No: Irregular cycles do not impact HCG levels but do result in inaccurate estimation of length of pregnancy and so if pregnancy test done too early after conception, maybe negative. ...Read more

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Do doctors trust the fertility test that tests for FSH on day 3 of a cycle? They supposedly are positive with levels of 25miu/ml of FSH in the urine.

Do doctors trust the fertility test that tests for FSH on day 3 of a cycle? They supposedly are positive with levels of 25miu/ml of FSH in the urine.

One way: It is one way and method, but i wouldn't rely on it completely. Other testings available and might be need for confirmation. ...Read more

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Can zoladex (goserelin) affect the accuracy of a pregnancy test result?

Can zoladex (goserelin) affect the accuracy of a pregnancy test result?

May be: You should be using birth control if on this drug. See the site below for more information, http://www.Ncbi.Nlm.Nih.Gov/pubmedhealth/pmh0000011/. ...Read more

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My clearblue digital ovulation test says pcos may affect the results. How? And does that mean it may cause false positives/negatives?

My clearblue digital ovulation test says pcos may affect the results. How? And does that mean it may cause false positives/negatives?

False positive: In pcos, the hormone lh may be elevated. This is the same hormone detected by the ovulation kit giving the false positive result. Since ovulation is not regular in pcos, it is difficult to detect the lh ovulation surge. ...Read more

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Do beta blockers affect the result of the blood tests for renin activity, aldosterone, cortisol and ACTH?? If so, is it worth to still test?!

Do beta blockers affect the result of the blood tests for renin activity, aldosterone, cortisol and ACTH?? If so, is it worth to still test?!

Blood tests: The simple and straightforward questions are important, so please set up an appointment with your primary doctor. Your irritable bowel issue, with high blood pressure is an indication that you need to see your doctor. in contrast, you should have your doctor refer you to a Psychologist because of your anxiety. Please keep me posted. ...Read more

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A friend of mine claims Paragard IUDs can cause positive pregnancy tests, by producing the hCG hormone. This is completely false, right?

A friend of mine claims Paragard IUDs can cause positive pregnancy tests, by producing the hCG hormone. This is completely false, right?

Wrong: Paragard IUDs do not cause + pregnancy tests, so if somebody does have a positive pregnancy test with a Paragard IUD in place, this should be evaluated further to determine if the pregnancy is in the uterus or outside the uterus (ectopic pregnancy) ...Read more

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I have hypocretin deficient narcolepsy which reduces TSH levels along with autoimmune hypothyroidism. Is the TSH test reliable to gauge my thyroid?

I have hypocretin deficient narcolepsy which reduces TSH levels along with autoimmune hypothyroidism. Is the TSH test reliable to gauge my thyroid?

Not always: TSH is not always a reliable test, because it relies on what the pituitary thinks, but different tissues may have different sensitivity to thyroid hormone. In addition, some people make too much reverse T3 (liothyronine), (liothyronine) which can block the action of T3 (liothyronine). Google "stop the thyroid madness" ...Read more

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Two questions. Will estrogen and other contraceptives affect the serum ACTH test? And will oral hypoglycemics affect BUN results?

Two questions. Will estrogen and other contraceptives affect the serum ACTH test? And will oral hypoglycemics affect BUN results?

Estrogen: In small amounts should not affect ACTH but theoretically, estrogen increases cortisol binding protein needing a little extra ACTH to compensate for the temporary decrease in free cortisol. Second question, they do not but we should be careful because renal imsufficiency makes them stronger ...Read more

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Obgyn says hormone levels do not show perimenopause, estrogen high. Is this test definitive or could results fluctuate day 2 day with hormone levels?

Obgyn says hormone levels do not show perimenopause, estrogen high. Is this test definitive or could results fluctuate day 2 day with hormone levels?

Regular periods?: If you are having regular periods, you are not perimenopausal. If your periods are irregular, you have hirsutism, and are overweight, you may have polycystic ovarian syndrome. Estrogen levels fluctuate throughout the menstrual cycle. An FSH level is a better indicator of perimenopause, and will become elevated as you enter menopause. ...Read more

Estrogen (Definition)

Estrogen is a hormone that is secreted by the ovaries and affects ovulation, ...Read more