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Reference ranges (reference intervals) for blood tests are sets of values used by a health professional to interpret a set of medical test results from blood samples. Reference ranges for blood tests are studied within the field of clinical chemistry (also known as "clinical biochemistry", "chemical pathology" or "pure blood chemistry"), the ...
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"Providers are encouraged to consult with their local lab(s) to obtain hormone level reference ranges for both 'male' and 'female' norms, [which can vary,] and then apply the correct range when interpreting results based on the current hormonal sex, rather than the sex of registration." [3] Fenway Health: United States: 100–200 pg/mL <55 ng ...
In a 2010 study of 596 women with PCOS which used liquid chromatography–mass spectrometry (LC–MS) to quantify testosterone, median levels of testosterone were 41 and 47 ng/dL (with 25th–75th percentiles of 34–65 ng/dL and 27–58 ng/dL and ranges of 12–184 ng/dL and 1–205 ng/dL) via two different labs. [50]
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The standard definition of a reference range for a particular measurement is defined as the interval between which 95% of values of a reference population fall into, in such a way that 2.5% of the time a value will be less than the lower limit of this interval, and 2.5% of the time it will be larger than the upper limit of this interval, whatever the distribution of these values.
Rule Criteria Suspected Example 1 2s: One measurement exceeds 2 standard deviations either above or below the mean of the reference range.: Inaccuracy and/or imprecision: 1 3s: One measurement exceeds 3 standard deviations either above or below the mean of the reference range.
The free androgen index is intended to give a guide to the free testosterone level, but it is not very accurate (especially in males — see endocrine society commentary below). Consequently, there are no universally agreed 'normal ranges', and levels slightly above or below quoted laboratory reference ranges may not be clinically significant.
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