Type I and Type II water are used as which type of water in CLSI terms?

• A. Clinical laboratory reagent water
• B. Autoclave wash water
• C. Special reagent water
• D. Drinking water

Answer: (A)

In CLSI terms, water used in the clinical laboratory is categorized as clinical laboratory reagent water (CLRW), which encompasses both Type I and Type II grades. Type I is the highest-purity water used for the most critical analytical tasks and calibration, while Type II serves routine lab procedures. Together, they define CLRW rather than other water categories. Autoclave wash water, special reagent water, and drinking water are not the CLSI CLRW classifications.