Blood gas analysis QC is performed with how many levels and how often?

• A. 2 levels every 8 hours
• B. 3 levels every 24 hours
• C. 2 levels every 24 hours
• D. 1 level every 8 hours

Answer: (A)

Two levels of QC are used to monitor blood gas analyzers, and they’re run every eight hours. Using two control levels covers a wider portion of the measurement range, helping detect both bias and imprecision that could affect patient results. Running QC at eight-hour intervals fits typical lab shifts and provides timely detection of drift or calibration issues, so results used for patient care remain trustworthy. Running fewer levels or checking less often could allow problems to go unnoticed, while this two-level, eight-hour approach balances safety with workflow.