Which pH level is indicative of acidosis in the blood?

Acidosis in the blood is defined by a decrease in pH, specifically when the blood pH falls below the normal range. The normal arterial blood pH range is approximately 7.35 to 7.45. When the pH drops below 7.35, it indicates an increase in acidity, which is classified as acidosis. This condition can occur due to various factors, including respiratory issues or metabolic dysfunctions. Understanding these pH levels is crucial in clinical settings, as they help diagnose and manage conditions affecting acid-base balance in the body.

In context, a pH above 7.35 is still considered normal or mildly alkaline, and the range between 7.35 and 7.45 encompasses the normal state, which is neither indicative of acidosis nor alkalosis. A pH level of exactly 7.40, while in the normal range, does not illustrate acidosis which specifically refers to pH values below the threshold of 7.35. Thus, pH levels below 7.45 signify a deviation towards acidosis.