Androstenedione: Understanding This Key Hormone Precursor

What Is Androstenedione?

Androstenedione is a steroid hormone that serves as a precursor — a building block — for the production of more potent sex hormones, including testosterone and estrogen. It is produced in both the adrenal glands and the gonads (the ovaries in women and the testes in men). Because it sits at a crossroads in the hormone production pathway, androstenedione can offer valuable insight into how the adrenal glands and gonads are functioning.

In healthy individuals, androstenedione is converted into testosterone and estrone as the body needs them. When this conversion process or the upstream production is disrupted, androstenedione levels may rise or fall, which can sometimes point to underlying hormonal imbalances. Measuring it is often part of a broader evaluation rather than a stand-alone diagnosis.

What the Test Measures

An androstenedione test measures the concentration of this hormone circulating in your blood. Because androstenedione is one of several androgens (so-called “male” hormones present in both sexes), clinicians often order it alongside related markers such as total and free testosterone, DHEA-S, 17-hydroxyprogesterone, and estrogen levels. Viewing these results together helps your clinician understand the bigger picture of your hormonal pathways.

This test may be used to help evaluate:

• Symptoms of androgen excess, such as excess hair growth (hirsutism), acne, or irregular menstrual cycles in women
• Suspected conditions affecting the adrenal glands, such as congenital adrenal hyperplasia
• Polycystic ovary syndrome (PCOS) as part of a larger workup
• Early or delayed puberty in children
• Monitoring of certain adrenal or gonadal conditions over time

Androstenedione Reference Ranges

Reference ranges can vary somewhat between laboratories and testing methods, and they differ by age and sex. The values below represent commonly cited adult standard ranges. Always interpret your result against the range provided by the laboratory that ran your test.

Levels in women may also fluctuate across the menstrual cycle, often peaking around mid-cycle. For this reason, the timing of your blood draw can influence the result, and your clinician may recommend a specific point in your cycle for testing.

What High Levels Can Mean

Elevated androstenedione is often a sign of increased androgen production from the adrenal glands or gonads. Higher-than-expected levels may be associated with several conditions, including:

• Polycystic ovary syndrome (PCOS), a common cause of androgen excess in women
• Congenital adrenal hyperplasia, a group of inherited disorders affecting adrenal hormone production
• Adrenal or ovarian tumors that secrete hormones (less common)
• Cushing’s syndrome or other conditions involving adrenal overactivity

In women, elevated levels can contribute to symptoms such as acne, excess facial or body hair, and menstrual irregularities. A high result does not by itself confirm any diagnosis — it signals the need for further evaluation and interpretation by your clinician.

What Low Levels Can Mean

Lower-than-expected androstenedione is less commonly a focus of concern, but it may be seen in certain situations, including:

• Adrenal insufficiency, where the adrenal glands underproduce hormones
• Ovarian or testicular failure
• Use of certain medications, such as corticosteroids or hormone therapies
• Natural age-related decline, as androgen production tends to decrease over time

Because androstenedione is a precursor hormone, low levels can sometimes reflect reduced production further down the pathway. Your clinician will consider these results in the context of your symptoms and other lab values.

How the Test Is Done

The androstenedione test is performed using a standard blood sample, typically drawn from a vein in your arm. The procedure is quick and similar to any routine blood draw.

Your clinician may give you specific instructions to improve accuracy. For women, this may include scheduling the draw at a particular phase of the menstrual cycle. You may also be asked about any medications or supplements you take, since some can affect hormone levels. Morning collection is sometimes preferred because several hormones follow a daily rhythm.

Putting Your Number in Context

A single androstenedione value is rarely the whole story. At ENNU, we emphasize looking beyond the broad “normal” reference range toward an optimal range that reflects how you actually feel and function. A result that falls within the standard range may still warrant attention if it appears alongside meaningful symptoms or shifts in your related hormones.

We also believe in tracking trends over time. Comparing your androstenedione results across multiple tests can reveal patterns that a one-time snapshot might miss — for example, a steady rise that prompts closer evaluation, or a stabilization that follows a change in your care plan.

Most importantly, androstenedione is best understood as one piece of a larger hormonal picture. Our root-cause philosophy means we consider this marker alongside your full panel, your symptoms, your medical history, and your goals. Hormone results require professional interpretation, and any decisions about testing, follow-up, or treatment should be made together with your clinician, who can tailor recommendations to your individual situation.