Testosterone for women: the blood tests used to monitor it.

When a woman's own doctor prescribes testosterone therapy after menopause, blood tests have a clear job: to confirm the level stays within the normal range for women, and to pick up any drift above it before side effects appear. A testosterone for women menopause test is therefore a safety check, not a measure of whether the treatment is working. This article explains what is monitored, when, and why.

To be plain about it: KnowLuna does not prescribe, supply or promote testosterone or any other medicine. Whether testosterone therapy is appropriate for you, and in what form, is a decision for your treating doctor. What follows describes the monitoring that doctor will typically arrange, and how KnowLuna can help with the tests.

Why testosterone is prescribed for some women, briefly

No change required; retain the following paragraph's statement that KnowLuna does not prescribe, supply or promote testosterone. Guidelines have found insufficient evidence to support its use for mood, energy, cognition or bone. It is a targeted treatment for a specific problem, and doctors who prescribe it follow a monitoring plan for that reason.

The baseline test, before therapy starts

Guidelines recommend measuring total testosterone before any treatment begins. This is not to decide whether a woman "needs" testosterone; there is no blood level that identifies low desire, and a low result does not on its own justify treatment. The baseline has two purposes:

• To exclude women whose level is already in the upper part of the female range, in whom adding more would push them above it.
• To provide a reference point, so that later results can be compared against where you started.

SHBG is usually measured at the same time, because it determines how much of the testosterone is free and active, and because SHBG rises with oestrogen taken by mouth, which many women on MHT are also using. The SHBG test is explained in its own article. Some doctors also check lipids and liver function at baseline.

What the monitoring test is watching for

The aim of monitoring is to keep total testosterone within the reference range for premenopausal women. Above that range the risk of androgenic side effects rises: acne, oily skin, increased body or facial hair, scalp hair thinning, and with sustained excess, voice changes that may not reverse. These are the things the blood test exists to prevent.

• Total testosterone. The primary monitoring marker. Measured in the morning, a consistent interval after the last application so that results are comparable from one test to the next.
• SHBG and free androgen index. Adds context, particularly if the total is at the upper end or symptoms suggest excess despite a normal total.
• Lipids. Depending on the therapy prescribed, your doctor may recheck a lipid profile periodically.
• Liver function. Checked by some doctors depending on your overall health and what has been prescribed.

The usual timing

Guidelines suggest rechecking testosterone a few weeks after starting, typically around the three to six week mark, once levels have settled. If the level is in range and you are well, subsequent checks are usually every six months while treatment continues. Your doctor may test sooner if side effects appear or if the therapy or your other medicines change.

Two practical points affect the result. First, testosterone has a daily rhythm and is highest in the morning, so morning collection is standard and keeping to the same time of day makes results comparable. Second, the sample should be taken at a consistent point relative to the last dose; if your therapy is applied to the skin, a level drawn straight after a dose can read misleadingly high. Your doctor will tell you the timing they want, and blood should not be taken from near the application site so the sample is not contaminated.

Judging whether the treatment is helping

This is not something a blood test can show. Guidelines advise a trial period, usually around six months, after which you and your doctor review whether the problem it was prescribed for has improved. If it has not, the recommendation is to stop rather than increase, because there is no evidence that higher levels help and the risk of side effects rises. A normal testosterone level does not mean the therapy is working, and a level at the top of the range is not "better".

Testosterone alongside menopausal hormone therapy

Many women prescribed testosterone are also on oestrogen-based MHT, and the two are monitored together by the treating doctor. The main interaction for testing purposes is SHBG: oestrogen taken by mouth raises it, which lowers the free fraction of testosterone. If a woman's MHT changes, her testosterone results may shift without any change in the testosterone dose, so tell whoever is reading the result what else has changed. Broader MHT monitoring is covered in blood tests while on menopausal hormone therapy.

Reading the result

Reference ranges for testosterone and SHBG differ between laboratories and assays, so we do not quote figures here, and results from different labs are not directly comparable. For monitoring, the most useful thing is consistency: same laboratory, same time of day, same interval after the last dose. That way a change in the number reflects a change in you, not in the method.

Common questions

General information only, not medical advice. If your symptoms are severe or sudden, see a doctor promptly.