Serum or plasma substance concentration (unspecified analyte) measured by immunoassay

Why This Test Is Done

Your doctor may order this test to check for abnormalities in substances that could indicate health issues like infections, autoimmune disorders, hormonal imbalances, or metabolic conditions. It may also be used to monitor how well a treatment is working or to screen for certain genetic or hereditary conditions.

How the Test Is Performed

A blood sample is taken from a vein, usually in your arm. You may feel a small pinch when the needle goes in, but the procedure usually takes less than five minutes. The blood is then sent to a lab for testing using an immunoassay method, which detects and measures specific proteins or substances in your blood.

What to Expect Before the Test

No special preparation is usually needed, but you may be asked to fast for a few hours if the test involves substances that change with food. Avoid smoking or consuming alcohol for a specified period before the test if instructed by your healthcare provider.

What to Expect After the Test

You may experience mild bruising, swelling, or discomfort at the injection site, which typically goes away within a day or two. Apply a cold compress if needed. If you experience severe pain, excessive bleeding, or signs of infection, contact your healthcare provider.