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TSH stands for Thyroid Stimulating Hormone. It is a hormone produced by the pituitary gland in the brain that stimulates the thyroid gland to produce thyroid hormones.
The ultra-sensitive TSH test is a blood test that measures the level of TSH in the blood. It is more sensitive than the standard TSH test and can detect even small changes in TSH levels. The ultra-sensitive TSH test is often used to diagnose and monitor thyroid disorders, such as hypothyroidism (an underactive thyroid) and hyperthyroidism (an overactive thyroid).
Normal TSH levels can vary depending on the laboratory and the assay used for the test, but typically fall between 0.4 and 4.0 milli-international units per liter (mIU/L). However, in some cases, a TSH level slightly above or below this range may be considered normal, depending on the individual’s age, gender, and other factors.
If your ultra-sensitive TSH level is higher than normal, it may indicate an underactive thyroid gland, while a lower-than-normal level may indicate an overactive thyroid gland. Your healthcare provider will interpret your test results in the context of your medical history and symptoms to determine the appropriate next steps.
|Room temperature||14 days|
|Freeze/thaw cycles||Stable x3|
Causes for Rejection
|0 to 6 d||0.700−15.200|
|7 d to 3 m||0.720−11.000|
|3 m 1 d to 12 m||0.730−8.350|
|1 to 5 y||0.700−5.970|
|6 to 10 y||0.600−4.840|
|Order Code||Order Code Name||Order Loinc||Result Code||Component Name|
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Copyright © 2022 Regenstrief Institute, Inc. All Rights Reserved. To the extent included herein, the LOINC table and LOINC codes are copyright © 1995-2023, Regenstrief Institute, Inc. and the Logical Observation Identifiers Names and Codes (LOINC) Committee. See https://