Complete Blood Count (CBC) Test

A complete blood count (CBC) is a common blood test that measures the different cells in your blood, including red blood cells, white blood cells, and platelets. It gives your doctor a broad picture of your overall health and can help detect many different conditions, often before symptoms appear.

The 17-Hydroxyprogesterone (17-OHP) test measures how much of this hormone is in your urine. 17-Hydroxyprogesterone is a substance (called a hormone) that your adrenal glands produce. Your body uses it to make cortisol, which is an important hormone that helps you respond to stress, maintain blood pressure, and regulate metabolism.

Your doctor may order this test as part of a routine checkup, to look into symptoms such as fatigue, weakness, fever, bruising, or unusual bleeding, to help diagnose a condition like anemia or an infection, or to monitor how an existing condition or treatment is progressing over time.

Your doctor may order this test to: 1) Screen for or confirm congenital adrenal hyperplasia (CAH), a genetic condition that affects how the adrenal glands produce hormones; 2) Monitor treatment for CAH or other adrenal disorders; 3) Help investigate symptoms like early puberty, irregular periods, or excessive hair growth in women.

The test is done with a simple blood draw. A health care professional will clean the site, wrap a band around your upper arm, and insert a small needle into a vein, usually in your arm. Only a small sample is needed, and the entire process usually takes just a few minutes.

For a urine 17-OHP test, you will typically collect all urine you produce over a 24-hour period in a special container provided by the lab. This is called a 24-hour urine collection. It's important to follow the collection instructions carefully - store the container in a cool place and bring it to the lab as directed.

Results show whether your blood cell counts fall within normal ranges. Values that are too high or too low can point to conditions such as anemia, infection, inflammation, bleeding disorders, or problems with blood clotting. Your doctor will interpret your numbers together with your symptoms, medications, and medical history to decide what they mean for you.

Normal levels of 17-Hydroxyprogesterone vary by age, sex, and in women, the menstrual cycle. Higher than normal levels may indicate congenital adrenal hyperplasia (CAH) or other adrenal disorders. Lower than normal levels are less common but may occur with certain conditions. Your doctor will interpret your results based on your specific situation.

This test is very safe. You may feel a quick sting when the needle goes in, and the puncture site may be slightly sore or bruised for a day or two. Serious complications, such as infection or heavy bleeding, are rare. Let your doctor know if you have a bleeding disorder or take blood thinners.

The urine test itself has no physical risks. The main challenge is collecting the sample correctly over the 24-hour period. Make sure to follow all collection instructions provided by your healthcare provider or laboratory.