The assessment of testosterone levels through blood test has become increasingly prevalent, with an increasing number of men struggling with loss of energy levels, lack of stamina, low libido, poor muscle mass, and overall hormonal issues. According to Evan Bass Men’s Clinic, however, interpreting the blood test result seems to be confusing, with no idea of what the numbers signify.
Therefore, gaining a clear perspective on the markers presented in a testosterone panel helps men grasp a better understanding of their hormonal health. Consequently, this can guide them in making well-informed decisions about future steps.
The Starting Point: Total Testosterone
Typically, a blood test report displays the total testosterone at the beginning. This number signifies the overall volume of circulating testosterone in one’s bloodstream. It comprises both testosterone that is bound to proteins and testosterone, which floats free and is thereby available for biological activity.
In general, laboratory reference ranges differ, with many showing a range from 300 to 1,000 ng/dL for adult males. While numbers below this reference range may signify low testosterone, it is essential to consider one’s age, overall health conditions, and symptoms. It is worth noting that a result showing lower testosterone does not necessarily indicate a problem; however, if symptoms such as fatigue, low stamina, lack of sex desire are experienced, accompanied by low T, further investigation is suggested.
Free Testosterone: The Active Form
Free testosterone suggests the remaining portion of testosterone that remains free-floating in the blood and is thereby readily available for the use of the body. Although free testosterone represents merely a minimal percentage of total testosterone, it is considered to be the most vital indicator of hormone function.
According to Evan Bass Men’s Clinic, free testosterone is commonly assessed either in pg/mL or as a computation derived from total testosterone, SHBG, and albumin. Low free testosterone may exist even at normal total testosterone levels, especially when SHBG levels are very high. This underlines the importance of free testosterone as a significant marker in revealing the true hormonal activity.
Understanding SHBG (Sex Hormone–Binding Globulin)
SHBG is a protein made in the liver that grabs onto testosterone and other sex hormones. The higher a person’s circulating levels of SHBG, the more testosterone is bound up and inactive. High SHBG levels may be a cause of aging, thyroid disorders, low protein intake, or certain medications. On the other hand, low SHBG levels are chiefly associated with obesity, insulin resistance, or high androgen levels.
Bioavailable Testosterone: The Middle Ground
Some tests are made using bioavailable testosterone, a way of measuring both free testosterone and the portion that is loosely bound to albumin. For usability, this value falls between total and free testosterone. It offers more information, mainly when abnormal levels of SHBG are present.
Additional Markers: LH, FSH, and Estradiol
Many clinicians also assess other hormones that impact or reflect testosterone production.
The Luteinizing Hormone, LH, shows how well the brain is conveying the signals to the testicles to produce testosterone. Low LH with low testosterone could indicate problems with one’s pituitary, while high LH levels suggest that the testicles are not responding appropriately.
FSH is helpful in the assessment of fertility and testicular function.
Although generally considered a female hormone, E2 plays critical roles in males in maintaining mood, libido, and bone health. High and low levels of E2 can produce symptoms that mimic low testosterone.
It is, therefore, recommended to follow the above guidelines and consult a seasoned healthcare provider to get a clear idea of the blood test report.