Understanding Your Diagnostic Laboratory Test: A Patient Guide

This test is a laboratory procedure that measures specific substances in a sample of your blood, urine, or other body fluid to help your doctor evaluate how well your body is working and to look for signs of disease, infection, or other health concerns.

The Corticotropin (ACTH) in Amniotic Fluid test measures the amount of adrenocorticotropic hormone in the amniotic fluid. ACTH is produced by the pituitary gland and plays a crucial role in stimulating the adrenal glands to produce cortisol, which helps the body manage stress and maintain blood pressure and blood sugar levels. This test uses a specialized technique called radioimmunoassay (RIA) to detect and measure the hormone at very low levels.

A trained healthcare professional will collect a small sample, most often by drawing blood from a vein in your arm using a sterile needle, and the sample is then sent to a certified laboratory where specialized equipment and laboratory staff analyze it and report the results to your doctor.

During an amniocentesis procedure, a small sample of amniotic fluid is collected from the uterus using a thin needle guided by ultrasound. The fluid sample is then sent to a laboratory where it is analyzed using radioimmunoassay techniques to measure the ACTH concentration. This procedure is typically performed in the second trimester of pregnancy, usually between 15-20 weeks.

Your doctor may order this test to help diagnose a medical condition, monitor an illness you already have, check how well your current treatment is working, or screen for potential health problems before symptoms appear, which can allow earlier and more effective care.

Your healthcare provider may recommend this test if there are concerns about fetal adrenal gland development or function. It may be used to evaluate babies at risk for certain endocrine disorders, including congenital adrenal hyperplasia (CAH), or to assess fetal well-being in high-risk pregnancies. The test helps doctors understand how well the baby's endocrine system is developing.