Alkalosis is defined by a blood pH greater than which value?

Alkalosis is defined by a blood pH greater than which value?

• A. 7.35
• B. 7.45
• C. 7.25
• D. 7.65

Answer: (B)

Alkalosis happens when the blood becomes more alkaline beyond the normal range. Normal arterial pH sits around 7.35 to 7.45, so alkalosis is defined by a pH greater than 7.45. That boundary—7.45—is the threshold used to label alkalemia. The other numbers don’t define the cutoff: 7.35 is the lower end of normal, 7.25 is acidic, and 7.65 would indicate a high level of alkalinity but isn’t the standard definitional threshold.

Alkalosis happens when the blood becomes more alkaline beyond the normal range. Normal arterial pH sits around 7.35 to 7.45, so alkalosis is defined by a pH greater than 7.45. That boundary—7.45—is the threshold used to label alkalemia. The other numbers don’t define the cutoff: 7.35 is the lower end of normal, 7.25 is acidic, and 7.65 would indicate a high level of alkalinity but isn’t the standard definitional threshold.