Blood Test: What It Is and Why Your Doctor Ordered It

A blood test is a common laboratory procedure in which a small sample of your blood is collected and analyzed to evaluate your overall health, screen for diseases, and measure the levels of cells, chemicals, and other substances circulating in your body.

The Androstenedione test measures the concentration of androstenedione, a steroid hormone, in the amniotic fluid. Amniotic fluid surrounds and protects the developing baby (fetus) in the womb. This test is performed as part of prenatal diagnostic testing, typically through a procedure called amniocentesis, where a small sample of amniotic fluid is collected and sent to a laboratory for analysis.

Your doctor may order this test to help diagnose a medical condition, monitor an existing illness or how well a treatment is working, check the function of organs such as the liver, kidneys, or heart, and screen for risk factors before symptoms appear.

This test is primarily used to evaluate fetal adrenal gland function and development. The adrenal glands produce various hormones, including androstenedione, which is a precursor to other important hormones like testosterone and estrogen. By measuring androstenedione levels in amniotic fluid, healthcare providers can gain insights into how well the fetal endocrine system is developing.

During the test, a healthcare professional will clean your skin, wrap a band around your upper arm, and draw a small amount of blood from a vein, usually in your arm, using a thin needle. The sample is sent to a laboratory for analysis, and the procedure usually takes only a few minutes.

The test requires collecting a sample of amniotic fluid through amniocentesis. During this procedure, a thin needle is inserted through the mother's abdomen into the uterus under ultrasound guidance to extract a small amount of amniotic fluid. The procedure is generally safe but carries a small risk of miscarriage, so it is typically performed when medically necessary.

Your results are compared with normal reference ranges. Abnormal values may point to infection, anemia, or problems with organs such as the liver or kidneys, but many factors, including medications, diet, and hydration, can affect the numbers. Your doctor will explain what your specific results mean and whether any follow-up testing or treatment is needed.

Results are interpreted in the context of the pregnancy timeline and other clinical findings. Your healthcare provider will explain what the androstenedione levels mean for your specific situation. Further testing may be recommended if abnormal levels are detected to determine the underlying cause.