Hormone Precursors Base Tests

The Hormone Precursors Base Tests panel contains 2 tests with 2 biomarkers.

Hormone Precursors Base Tests

The following is a list of what is included in the item above. Click the test(s) below to view what biomarkers are measured along with an explanation of what the biomarker is measuring.

Also known as: Sex Hormone Binding Globulin SHBG, SHBG, TeBG, Testosterone-estrogen Binding Globulin

Sex Hormone Binding

The sex hormone binding globulin (SHBG) test measures the concentration of SHBG in the blood. SHBG is a protein that is produced by the liver and binds tightly to testosterone, dihydrotestosterone (DHT), and estradiol (an estrogen). In this bound state, it transports them in the blood as an inactive form. The amount of SHBG in circulation is affected by age and sex, by decreased or increased testosterone or estrogen production and can be affected by certain diseases and conditions such as liver disease, hyperthyroidism or hypothyroidism, and obesity. Changes in SHBG levels can affect the amount of testosterone that is available to be used by the body's tissues. A total testosterone test does not distinguish between bound and unbound testosterone but determines the overall quantity of testosterone. If a person's SHBG level is not normal, then the total testosterone may not be an accurate representation of the amount of testosterone that is available to the person's tissues.

Also known as: ,25-Hydroxyvitamin D2, 25-Hydroxycholecalciferol (25OHD3), 25-OH-D2,D3 Vitamin, D2 Vitamin,25-Hydroxyvitamin D3,25-OH-D3, QuestAssureD 25Hydroxyvitamin D D2 D3 LCMSMS, Vitamin D, Vitamin D, 25-Hydroxy, Vitamin D2, 25-hydroxy,25-Hydroxyergocalciferol (25OHD2),Vitamin D3, 25-hydroxy

Vitamin D, 25-Oh, Total

Vitamin D comes from two sources: endogenous, which is produced in the skin on exposure to sunlight, and exogenous, which is ingested in foods and supplements. The chemical structures of the types of vitamin D are slightly different, and they are named vitamin D2 (ergocalciferol, which comes from plants) and vitamin D3 (cholecalciferol, which comes from animals). The D2 form is found in fortified foods and in most vitamin preparations and supplements. Vitamin D3 is the form produced in the body and is also used in some supplements. Vitamin D2 and D3 are equally effective when they are converted by the liver and the kidney into the active form, 1,25-dihydroxyvitamin D.
*Process times are an estimate and are not guaranteed. The lab may need additional time due to weather, holidays, confirmation/repeat testing, or equipment maintenance.

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