Blog — Testosterone Deficiency

Why a Hormone Profile Is Better Than a Single Test. When men experience hormone-related symptoms (like low libido, fatigue, weight gain, or mood changes), it’s rarely just one hormone causing the issue. A simple testosterone check may miss the bigger picture.

Low Testosterone & Male Hormone Imbalance: What Every Man Should Know Are you feeling constantly tired, gaining belly fat, or noticing changes in your mood and sex drive? These aren’t just signs of “getting older.” They could be symptoms of low testosterone or a broader male hormone imbalance. Why Male Hormones Matter Hormones act as chemical messengers, controlling everything from energy and mood to muscle strength, weight, and sexual health. Think of them like instruments in a band: when they play in harmony, everything feels right. But when one is out of balance, the entire performance suffers. The key male...

The UK is facing a growing obesity crisis, with two-thirds of adults and a rising number of children classified as overweight or obese. A recent UK Parliament briefing highlights alarming trends, including regional and ethnic disparities and increased risks linked to socioeconomic status. While public health strategies continue to evolve, addressing the hormonal root of weight gain may offer a more effective, personalized solution. ZRT Laboratory’s Weight Management Profile helps uncover hidden hormonal imbalances—such as elevated cortisol, low testosterone, or thyroid dysfunction—that contribute to stubborn fat gain, poor metabolism, and increased disease risk.

As men age, they may experience a decline in testosterone levels which can lead to a range of symptoms commonly referred to as male menopause or andropause. This condition is not as well-known as female menopause, but it can have a significant impact on a man's quality of life. Fortunately, there are treatments available, including hormone testing, to help alleviate the symptoms associated with male menopause. What is Male Menopause? Male menopause is a condition caused by a decline in testosterone levels as a man ages. Testosterone is the primary male sex hormone and is responsible for many of the...

Low testosterone in older men, often referred to as “male menopause” or even “andropause” is fairly well known — and testosterone replacement therapy in this age group has not been without its share of controversy, particularly with respect to heart health. Proper testing and dosing are all-important, as well as understanding a man’s physiology and all the factors that affect testosterone levels. For example, when giving testosterone transdermally it is critical to use testing methods such as dried blood spot or saliva to properly assess absorption of testosterone into the body, avoiding the problem of overdosing to achieve “normal” serum levels. But while...