Serum or Plasma Substance Concentration by Immunoassay (General Protein or Antibody)

What This Test Measures

This test detects the presence and concentration of a particular protein or antibody in your serum or plasma. The method involves an immunoassay, which uses antibodies to identify and quantify the target substance. This can include proteins like immunoglobulins (antibodies), enzymes, hormones, or other substances that may be elevated or present in abnormal amounts due to health conditions.

Why It Might Be Ordered

Your healthcare provider may order this test to diagnose, monitor, or evaluate conditions such as infections, autoimmune diseases, certain cancers, or other systemic disorders. It can also be used to check for the presence of specific substances that may indicate exposure to toxins, allergens, or other environmental factors.

Sample Collection and Preparation

A blood sample is collected from a vein in your arm. The blood is then processed to separate the serum (liquid part after clotting) or plasma (liquid part before clotting). This sample is sent to a laboratory for analysis.

Test Results and Interpretation

Results are reported as a concentration value, which may be compared to a reference range provided by your healthcare provider. While reference ranges can vary, abnormal results may prompt further testing or evaluation to understand the underlying cause.