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Levothyroxine is a frequently prescribed drug in the United States, particularly for older people, as lower thyroid function can be associated with aging.
TSH values may also be lower than normal (particularly in the first trimester) and the normal range should be adjusted for the stage of pregnancy. [ 8 ] [ 44 ] In pregnancy, subclinical hypothyroidism is defined as a TSH between 2.5 and 10 mIU/L with a normal thyroxine level, while those with TSH above 10 mIU/L are considered to be overtly ...
Levothyroxine is typically used to treat hypothyroidism, [12] and is the treatment of choice for people with hypothyroidism [13] who often require lifelong thyroid hormone therapy. [14] It may also be used to treat goiter via its ability to lower thyroid-stimulating hormone (TSH), which is considered goiter-inducing.
An increase in TSH above the normal range indicates under-replacement or poor compliance with therapy. A significant reduction in TSH suggests over-treatment. In both cases, a change in dose may be required. A low or low-normal TSH value may also signal pituitary disease in the absence of replacement. [citation needed]
Levothyroxine dosing to normalise TSH is based on the amount of residual endogenous thyroid function and the patient’s weight, particularly lean body mass. [15] The dose can be adjusted based upon each patient, for example, the dose may be lowered for elderly patients or patients with certain cardiac conditions, but should be increased in ...
The lower two thirds of the lobes are connected by a thin band of tissue called the isthmus (pl.: isthmi). Microscopically, the functional unit of the thyroid gland is the spherical thyroid follicle , lined with follicular cells (thyrocytes), and occasional parafollicular cells that surround a lumen containing colloid .
When pregnant, a woman with a low-functioning thyroid will also need to increase her dosage of thyroid hormone. [16] One exception is that thyroid hormones may aggravate heart conditions, especially in older patients; therefore, doctors may start these patients on a lower dose and work up to a larger one to avoid risk of heart attack. [17]
Thyroid function tests (TFTs) is a collective term for blood tests used to check the function of the thyroid. [1] TFTs may be requested if a patient is thought to suffer from hyperthyroidism (overactive thyroid) or hypothyroidism (underactive thyroid), or to monitor the effectiveness of either thyroid-suppression or hormone replacement therapy.
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related to: if tsh is low why lower levothyroxine dose good- 109 S High St #100, Columbus, OH · Directions · (614) 224-4261