Final answer:
To alleviate Ms. Yan's concerns about her INR results, the medical assistant can explain that standardized procedures and quality control measures are in place, including equipment calibration and double-checking of test samples and labels.
Step-by-step explanation:
When Ms. Yan questions the accuracy of her INR results, the medical assistant can assure her by explaining that coagulation tests are standardized procedures, which include extensive quality control measures. The liver production of coagulation factors is a critical process and INR is a specific test that measures how quickly blood clots compared to a normal sample, with a higher INR indicating slower coagulation. To ensure accuracy, the lab follows a protocol which includes calibration of equipment, regular maintenance, and cross-checking results against known controls. Additionally, the medical team verifies procedure names, ensures instruments and needle counts are correct, and double-checks specimen labels for patient name to avoid mix-ups. If there were any irregularities or equipment issues, these would be noted and addressed to maintain test accuracy and reliability.