QA/QC in a diagnostic laboratory is primarily about ensuring which characteristics of analytical results?

• A. Accuracy, precision, and reliability
• B. Speed and throughput
• C. Exclusively regulatory compliance
• D. Only instrument cleanliness

Answer: (A)

QA/QC in a diagnostic laboratory focuses on ensuring analytical results are accurate, precise, and reliable. Accuracy is how close a measurement is to the true value or a reference standard. Precision is the consistency of repeated measurements under the same conditions. Reliability means you can trust the results over time and across different runs, instruments, and operators, supported by proper controls, calibration, and proficiency testing. Together, these aspects make results trustworthy for clinical decisions and patient care.

Speed, throughput, and efficiency relate to how fast tests are run, but they don’t guarantee the correctness of the results. Regulatory compliance is important, but QA/QC aims at the quality of the data itself. Instrument cleanliness matters for function, but on its own it doesn’t ensure accuracy or precision.