Tumor marker detection reagents play an important role in early cancer screening, treatment efficacy monitoring, and prognosis assessment. Their testing process must strictly adhere to standardized procedures to ensure accurate and reliable results.
Sample collection and processing are the first steps in testing. Serum or plasma is typically used as the test sample. After collection, it must be stored at 2-8°C and sent for testing as soon as possible. For long-term storage, it should be kept at -20°C or lower to avoid repeated freeze-thaw cycles. When collecting blood, avoid hemolysis, lipemia, or icteric samples to prevent interference with test results.
During reagent preparation, ensure that the test reagents are within their expiration date and rewarm or dilute according to the instructions in the manufacturer's instructions. Some reagents may require pretreatment, such as equilibration to room temperature or vortex mixing. Additionally, negative and positive controls should be included to verify the validity of the test system.
Tests typically utilize immunoassays, such as chemiluminescent immunoassays (CLIA), enzyme-linked immunosorbent assays (ELISA), or electrochemiluminescence assays (ECLIA). Taking the chemiluminescence method as an example, the treated sample is incubated with a labeled antibody to form a complex through specific antigen-antibody binding. A luminescent substrate is then added, and the intensity of the light signal is detected by an instrument, thereby quantifying the tumor marker concentration.
The analysis and reporting of results must be interpreted in conjunction with clinical reference ranges. Normal values for different tumor markers may vary depending on the testing method or laboratory, and therefore require comprehensive judgment by a professional physician based on the patient's medical history, imaging studies, and other factors. The test report should include the marker name, test value, unit, and reference range, and should also indicate the testing method and testing time.
The entire testing process must be conducted in a standardized laboratory environment and strictly adhere to quality control standards to ensure the clinical value of the test results.