Most men do not think about their testosterone levels until something feels noticeably wrong. The tiredness that sleep does not fix. The weight that keeps accumulating around the middle despite reasonable effort. The loss of drive is hard to explain to a doctor or to anyone else.
And most women do not think about their testosterone at all, because the conversation around this hormone has been so thoroughly framed as a male issue that it does not occur to many women that their bodies produce and depend on it, too.
A testosterone test is a simple blood test that measures the amount of this hormone circulating in the body. It is not ordered often enough, and when it is, the results are not always interpreted with the context they need. Read all about when the test is indicated, what the results mean, and what happens when levels are outside the normal range.
Testosterone is produced primarily in the testes in men and in the ovaries and adrenal glands in women. In men, it regulates muscle mass, bone density, red blood cell (RBC) production, libido, mood, and sperm production. In women, it contributes to libido, bone strength, energy, and mood regulation, though at much lower concentrations than in men. When levels fall outside the normal range, in either direction, the effects can be felt across multiple body systems. This is why a testosterone test for men and women is relevant beyond just reproductive health. It is a window into hormonal balance that affects how the body functions overall.
Low testosterone symptoms in men are varied enough that they are frequently attributed to other causes, which is one reason hypogonadism, the medical term for low testosterone, is underdiagnosed.
The most commonly reported symptoms include:
In younger men, delayed puberty, underdeveloped genitalia, and absence of normal secondary sexual characteristics may prompt earlier investigation.
Women are not tested much for testosterone, but in some situations, it is required. When women are diagnosed with PCOS, it could be due to high testosterone. Low testosterone in women often leads to low libido, excessive fatigue and low mood. When a woman is suspected of having PCOS, when she is finding it difficult to conceive or has any symptoms that suggest that androgen is in excess or deficiency, a testosterone test is done for women.
How is testosterone test done, a question with a straight forward answer. It is a blood test, usually drawn from a vein in the arm. What matters more than the mechanics is the timing.
Testosterone levels follow a diurnal rhythm in men. They are highest in the early morning, typically between 7 and 10 AM, and decline throughout the day. By the afternoon, levels can be significantly lower than in the morning, sometimes by 30-35%. A test drawn at 3 PM can show a level that looks low when, in fact, the morning level may have been perfectly normal.
For this reason, testosterone testing should always be done in the morning, ideally between 7 and 10 AM, and on two separate occasions before any diagnosis of hypogonadism is confirmed. A single low result is not sufficient to make a clinical decision.
The test measures total testosterone, which is the combined amount of bound and free testosterone in the blood. In some cases, particularly when total testosterone sits in the borderline range or when symptoms persist despite apparently normal levels, free testosterone is measured separately. Free testosterone is the biologically active portion that the body can actually use.
Additional tests that are often ordered alongside testosterone include LH (luteinising hormone), FSH (follicle-stimulating hormone), prolactin, and sex hormone-binding globulin, as these help identify if the problem is in the testes themselves or in the brain's signalling.
Understanding normal testosterone levels by age is important because what is normal at 25 is not the same as what is normal at 55, and reference ranges vary between laboratories.
In men, the broadly accepted reference range for total testosterone is 300 to 1000 nanograms per decilitre (ng/dL), or approximately 10 to 35 nanomoles per litre (nmol/L) in the units used by most Indian laboratories.
Age-related changes in men follow a general pattern:
In women, normal testosterone levels are considerably lower. The reference range for adult women is 15 to 70 ng/dL (0.5 to 2.4 nmol/L), with levels reducing after 30 and further after menopause.
A testosterone test is a simple investigation that answers questions many men and women carry around for years without ever asking. If the symptoms fit, the test is worth doing. If the result is low, the work of understanding why has barely started. Getting tested is not a sign of weakness. It is a practical step toward understanding what the body is actually doing.
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Low testosterone symptoms in men include persistent fatigue, reduced libido, erectile dysfunction, loss of muscle mass, increased abdominal fat, low mood, and poor concentration. In women, low testosterone can cause fatigue, reduced libido, and low mood. Left unaddressed, chronically low testosterone in men accelerates bone loss and raises the risk of metabolic conditions.
In men, normal total testosterone generally falls between 300 and 1000 ng/dL, with levels being highest in the late teens and early twenties and declining gradually from the mid-twenties onward. Normal testosterone levels by age in women range from 15 to 70 ng/dL, declining naturally after 30. Reference ranges vary between laboratories, so results should always be read alongside the specific range provided by the testing facility and interpreted by a doctor in a clinical context.
The best time is between 7 and 10 in the morning. Testosterone follows a daily rhythm and is at its highest in the early morning, falling significantly throughout the day. An afternoon test can produce a result that appears low when morning levels are entirely normal. For a reliable assessment, testing should be done in the morning on at least two separate occasions before any clinical decision about treatment is made.
Fasting is not required for a testosterone test specifically. What matters most is timing, which should be in the morning between 7 and 10. Avoiding intense exercise the evening before and limiting alcohol intake in the 24 hours before the test is advisable. If the testosterone test is part of a broader hormonal or metabolic panel, confirm fasting requirements with your doctor beforehand, as other tests in the panel may require different preparation.
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