Testosterone, Free and Total, MS

For males: Total Testosterone measures the overall amount of testosterone (bound and unbound) in the blood. It's the primary male sex hormone, crucial for muscle mass, bone density, libido, energy, and mood. Levels decline with age. Low levels (hypogonadism) can cause various symptoms. Optimal ranges for symptom relief and well-being are often targeted in the mid-to-upper end of the standard reference range, considering Free Testosterone as well. Important Notes:

1. Testosterone levels naturally vary by age.
2. Testosterone levels are typically highest in the morning (e.g., 8-10 AM), and reference ranges are usually based on morning samples. Levels measured later in the day may be lower.
3. Consider measuring Free Testosterone, SHBG, and Albumin for a more complete picture, especially if Total T is borderline or symptoms are present despite normal Total T.

For females: Total Testosterone measures the overall amount of testosterone (bound and unbound) in the blood. It plays a role in sexual desire/arousal, energy, mood, and helps support muscle and bone. Levels vary across the menstrual cycle and tend to decline with age. Elevated levels (hyperandrogenism) are more commonly the clinical issue in women and should be evaluated promptly.

Free Testosterone (Direct) refers to free testosterone measured directly rather than estimated from a formula. In our data this direct family includes methods such as equilibrium dialysis and ultrafiltration. These methods are often used when a clinician wants a non-calculated assessment of free testosterone, especially when changes in binding proteins such as SHBG may make calculated estimates less reliable.

Important Notes:

1. This is a measured, non-calculated free testosterone result.
2. Different labs may use equilibrium dialysis or ultrafiltration, so reference ranges can differ by method.
3. When possible, compare results over time using the same method.