Tumor marker detection reagents are valuable for cancer screening, treatment efficacy monitoring, and prognosis assessment, but the accuracy of their test results is affected by multiple factors. To ensure reliable test results, master the following key usage tips.
1. Sample Collection and Processing
Specimen type (e.g., serum, plasma, or whole blood) must strictly follow the reagent instructions. Serum samples should avoid hemolysis, lipemia, or icterus. After collection, they should be centrifuged promptly and stored at 2-8°C. For long-term storage, they should be frozen (-20°C or colder). Repeated freeze-thaw cycles may cause protein degradation and affect test results. Therefore, aliquoting is recommended.
2. Reagent Storage and Expiration Date
Tumor marker detection reagents should generally be stored at 2-8°C, protected from light. Some reagents (e.g., chemiluminescence assays) may require refrigeration. Before use, check the expiration date and storage conditions of the kit to avoid using expired or deteriorated reagents. Reagents from different batches may vary, so mixing is not recommended.
3. Standardized Operations
Strictly follow the instructions, including sample volume, incubation time, and temperature control conditions. Automated testing equipment requires regular calibration, and manual operation requires careful attention to pipette precision to avoid human error. The use of quality control products is crucial. Each batch of testing should include high, mid, and low-value quality control samples to ensure that results are within controllable ranges.
4. Interpretation of Results and Confounding Factors
Tumor marker levels may be affected by non-tumor factors (such as inflammation and cirrhosis). Abnormalities in a single marker should be interpreted in conjunction with clinical and other examinations. Certain medications (such as hormones) or the patient's physiological conditions (such as pregnancy) may also interfere with results. A detailed patient medical history should be obtained before testing.
Mastering the above techniques can significantly improve the accuracy and reliability of tumor marker testing, providing stronger support for clinical diagnosis and treatment.