Hydrogen ion concentration in blood

Hydrogen ion concentration in blood is not a molecular target, receptor, enzyme, transporter, or other conventional drug target, but rather a physiological parameter related to acid-base status and pH regulation in the body[2][3][9]. It is a measurement used in clinical diagnostics and monitoring, reflecting the acid-base balance crucial for normal physiological functioning. Hydrogen ion concentration in blood reflects the acid-base status of circulating blood, typically measured as pH, which represents the negative logarithm of hydrogen ion activity[2][3][9]. Physiologically, a normal arterial blood pH is tightly maintained between 7.35 and 7.45, corresponding to a hydrogen ion concentration of approximately 40 nEq/L (nmol/L)[9]. Slight imbalances disrupt protein structure and enzymatic activity, affecting all organ systems. Homeostasis is maintained by three main mechanisms: Buffer systems (mainly bicarbonate/carbonic acid in blood); Respiratory regulation (via exhalation of CO₂ by the lungs); and Renal regulation (via excretion of H⁺ and reabsorption of bicarbonate ions in the kidneys)[2][3][6][7]. Drugs may impact hydrogen ion concentration in blood indirectly (e.g., diuretics, acidifying or alkalinizing agents), but these do not "target" hydrogen ion concentration as a discrete molecular entity—rather, they shift acid-base balance by influencing physiological pathways or organ function. Therefore, "hydrogen ion concentration in blood" is best understood as a clinical measure rather than a molecular drug target. The "hydrogen ion concentration in blood" is not a canonical drug target for therapeutics, but a vital sign and diagnostic marker for metabolic or respiratory derangements[2][3][4][9].

Other names

blood pH[H+]acid-base statushydrogen ion activity in bloodacidemia/alkalemia