Testosterone can be broken down into different 'types': total, free, serum, and bioavailable testosterone.
The steroid hormone testosterone belongs to a group of androgens produced in humans.
It is not just a sex hormone, but does more than just contribute to secondary sex characteristics.
It can affect behavior, produce anabolic effects, as well as numerous aspects of physical, emotional, and mental health and wellness. Buy Testo-Max online here.
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Testosterone is a hormone produced by the male testes, more specifically by testicular Leydig cells.
It’s also produced in very small amounts by women’s ovaries.
Very small amounts are also produced by male and female adrenal glands, which are located on top of the kidneys.
Levels will fluctuate based on age, gender, and current health conditions.
Levels can also be impacted by a number of issues including illness, infection, and injury to the testicles or even a malfunctioning pituitary gland.
What? What does the pituitary gland have to do with production?
The pituitary gland, called the master gland of the body, is responsible for maintaining the functions as well as control over the increase or decrease of hormones produced and secreted by all hormone glands found in the endocrine system.
The pituitary gland sends these signals to the testes to either increase or decrease testosterone production.
In turn, the pituitary gland receives the orders to stimulate this production from the hypothalamus gland, also located in the brain, responsible for homeostasis or balance in the body.
It’s a rather simplistic explanation of how testosterone is made, but without getting into the depths of anatomy and physiology, the endocrine system, glands, and secretions of those glands work together to balance hormone levels that can affect not only specific organs, but entire body systems.
It is a powerful hormone in the body, but can also be broken down into a number of components and measured separately.
Testosterone is a hormone that circulates in the blood in two basic forms: bound to blood proteins (sex hormone binding globulin or SHBG, also known as androgen binding protein and another protein called albumin) or unbound to proteins.
Either of these forms is known as bioavailable, meaning that the androgen is ready and available for use by the cells.
In the past it was believed that only free testosterone was bioavailable, but studies have determined that even non-bound is as well.
Total test levels may be within normal range even if bioavailable testosterone measurements are deemed low.
It should also be noted that levels of the androgen in the testicles are naturally much higher than measured in the bloodstream, as much is 20 times greater.
A man given testosterone replacement therapy may therefore experience an increase of overall total testosterone when measured in the blood, which will then signal the testes to stop manufacturing the hormone.
This results in a decrease in levels in the testes, resulting in potential shrinkage as well as lack of sperm production.
Bioavailable and free levels are typically parallel to those of total levels.
However, time of day the blood test was taken, age, and health status can also have an impact on ranges for any man in any given situation.
Measurements of total amounts are analyzed with a test known as TTST (testosterone, total, serum).
This is one of the most common tests in regard to determining diagnosis of low T, and is often combined with other hormone tests including luteinizing hormone.
A bioavailable testosterone test may also be recommended for a definitive diagnosis. This test is known as a TTBS test (testosterone, total, bioavailable, serum).
Total reference values for adult men typically average 300 to 950 ng per deciliter. Levels of free T will differ by age.
For example, a 30-year-old man may measure 1.51 to 18.57 ng per deciliter of free T, while a 65-year-old man may measure between the 0.77 to 13.30 ng per deciliter.
The bioavailable testosterone range of levels also depends on age.
A 20 to 29-year-old man may measure between 83 to 257 ng per deciliter, while a 50 to 59-year-old man may measure with 50 to 190 ng per deciliter.
Men concerned about their hormone levels should schedule a visit with their general practitioner, who can recommend a simple blood draw that can be sent to a lab to analyze a number of aspects when it comes to hormone levels.
Each “type”, including free (unbound), bioavailable, or bound can have an impact on overall total levels.
Talk to your doctor about the level of bioavailable testosterone in your body, in addition to total levels that can be used to determine if you are within normal range based on gender, age, and health.Alcohol TestosteroneAnabolic TestosteroneBenefits of TestosteroneBest Testosterone Boosting SupplementsBest Testosterone StackBest Testosterone SteroidBest Time Day Take TestosteroneBioavailable TestosteroneBioidentical TestosteroneDHT and TestosteroneEffects of TestosteroneExogenous TestosteroneFunction of TestosteroneIs Testosterone SafeSynthetic TestosteroneTestosteroneTestosterone AlternativesTestosterone BlendTestosterone DeficiencyTestosterone Detection TimeTestosterone DosageTestosterone DropsTestosterone Half LifeTestosterone Side EffectsTestosterone SuppressionTypes of Testosterone