Serum/plasma substance concentration (qualitative) for a specific protein marker measured by immunoassay

What This Test Measures

This test measures the concentration of a specific protein in your blood using an immunoassay method. Immunoassays detect and quantify proteins by identifying their unique molecular structure. The result is qualitative, meaning it only tells you whether the protein is present or not, rather than providing a precise amount.

Why It’s Ordered

Your healthcare provider may order this test if they suspect conditions like protein-losing syndromes, certain infections, or metabolic disorders that involve abnormal protein levels. It can also be part of a broader evaluation for unexplained symptoms such as fatigue, swelling, or changes in urine appearance.

Sample Collection and Preparation

A blood sample is collected from a vein in your arm. The blood is then processed to separate the serum or plasma, which is sent to the lab for testing. No special preparation is needed, but fasting may be advised depending on the clinical context.

What to Expect Before the Test

You may be asked to avoid certain medications or foods that could interfere with the test results. Follow any specific instructions your healthcare provider gives you, such as fasting or limiting certain activities.