Serum or Plasma Tetramethylbenzidine (TMB) Substance Concentration (for Immunoassay-Based Detection)

What This Test Measures

The TMB-based immunoassay detects the presence or level of a target analyte (e.g., a protein, hormone, or antibody) by reacting with it. The TMB substrate produces a measurable color change proportional to the analyte concentration, allowing for qualitative or quantitative results depending on the assay type.

Common Uses in Clinical Practice

This test is frequently used in screening or confirmatory assays for conditions like autoimmune diseases, infections, or certain cancers. It may also be part of a broader diagnostic panel to monitor treatment responses or detect early signs of illness.

Specimen and Preparation

A blood sample is typically collected in a tube without anticoagulant (for serum) or with an anticoagulant (for plasma). The sample is processed to separate the serum or plasma from blood cells before testing. Avoid fasting unless instructed, as certain substances may be affected by diet.

Test Turnaround and Results

Results may be available within hours to a few days, depending on the lab’s workflow and whether the test is part of a routine panel or a specialized request. Qualitative results indicate presence/absence, while quantitative results provide exact concentrations.