Tetramethylbenzidine (TMB) substrate concentration in serum/plasma (immunoassay-based chemiluminescent measurement)

What This Test Measures

TMB is a colorless compound that reacts with enzymes in immunoassays to produce a measurable signal. In this test, it helps quantify the presence of targeted substances, such as antibodies or antigens, by detecting the chemiluminescent reaction it undergoes. This process is often used in advanced diagnostic testing for conditions like rheumatoid arthritis, lupus, or other autoimmune disorders.

Why It Matters in Diagnostics

While TMB itself isn’t a direct clinical marker, its measurement is critical in the broader context of immunoassay results. It ensures accurate detection limits and signal reliability, which are essential for diagnosing conditions where subtle antibody or antigen levels are involved.

Common Uses in Medical Testing

This test is frequently used in screening or confirmation phases of immunoassays, particularly for detecting markers associated with autoimmune diseases, infections, or other inflammatory conditions. It may also be part of a panel to monitor treatment responses.

Sample Collection and Preparation

A blood sample is typically drawn from a vein. The serum or plasma is separated from blood cells and sent to the lab for testing. The TMB reaction is performed on the serum/plasma sample to generate the measurable signal.