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What is pH balance? Your bodyâs pH balance, also referred to as its acid-base balance, is the level of acids and bases in your blood at which your body functions best. The human body is built to naturally maintain a healthy balance of acidity and alkalinity. The lungs and kidneys play a key role in this process. A normal blood pH level is 7.40 on a scale of 4 to 11, where 4 is the most acidic and 11 is the most basic. This value can vary slightly in either direction. If the lungs or kidneys are malfunctioning, your bloodâs pH level can become imbalanced. Disruption in your acid-base balance can lead to medical conditions known as acidosis and alkalosis. Both conditions require treatment from a medical professional, not simply dietary changes. How the lungs and kidneys maintain the pH balance The lungs control your bodyâs pH balance by releasing carbon dioxide. Carbon dioxide is a slightly acidic compound. Itâs also a waste product produced by cells in the body as they use oxygen. The cells release it into your blood, and itâs taken to your lungs. When you exhale, youâre expelling that carbon dioxide, a process that also helps regulate your bodyâs pH balance by reducing acidity. The amount of carbon dioxide you exhale is a function of how deeply you inhale or exhale. Your brain constantly monitors this in order to maintain the proper pH balance in your body. The kidneys help the lungs maintain acid-base balance by excreting acids or bases into the blood. The kidneysâ effect on acidity works much more slowly than that of the lungs. pH balance disorders A blood pH imbalance can lead to two conditions: acidosis and alkalosis. Acidosis refers to having blood thatâs too acidic, or a blood pH of less than 7.35. Alkalosis refers to having blood thatâs too basic, or a blood pH of higher than 7.45. There are different types of acidosis and alkalosis based on the underlying cause.