What does acidemia mean?
Acidemia is a medical term describing an abnormal accumulation of acid in the blood, resulting in a blood pH below the normal range of roughly 7.35 to 7.45. It is detected through arterial blood gas analysis and can stem from metabolic causes, such as kidney failure, diabetic ketoacidosis, or lactic acid buildup, or from respiratory causes, such as inadequate ventilation leading to carbon dioxide retention. The severity of acidemia often guides urgent clinical decisions, since pronounced acidity can impair enzyme function, cardiac performance, and cellular metabolism. The term belongs to a family of '-emia' words denoting blood conditions, alongside anemia and alkalemia, its opposite. Closely related is 'acidosis', which refers to the underlying process that drives the blood's pH down; clinicians distinguish the two carefully, as compensatory mechanisms can mask one while the other persists. Though rarely encountered outside hospitals and textbooks, acidemia is a precise, useful term for understanding how the body regulates its internal chemistry.
nounAn abnormally high level of acid in the blood, typically reflected by a lower-than-normal blood pH; it is a laboratory finding that may arise from metabolic or respiratory causes.
- A medical condition in which the hydrogen ion concentration of the blood is elevated, producing a blood pH below the normal range of about 7.35–7.45.
"The infant's severe acidemia prompted immediate transfer to the neonatal intensive care unit."
"Blood gas analysis confirmed marked acidemia, with a pH of 7.18."
"Umbilical cord sampling at delivery can reveal fetal acidemia even when the newborn appears vigorous."
Rarely pluralized in practice; the singular is standard even when multiple cases or episodes are discussed.
"The study compared acidemias of metabolic and respiratory origin."
Acidemia doesn't name a disease itself — it's the blood's pH alarm bell, and doctors treat the cause, not just the number.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of acidemia
Acidemia derives from New Latin, combining 'acidus' (Latin for 'sour' or 'sharp') with the Greek-derived suffix '-emia', meaning 'condition of the blood', which itself traces back to Greek 'haima' (blood). The word follows the pattern of other clinical blood-condition terms such as anemia and uremia, which were coined in nineteenth-century European medicine. Its British variant spelling, 'acidaemia', reflects the same Greek root rendered with the 'ae' ligature favored in British medical writing.
Related word forms
How acidemia is actually used
Strictly a technical medical term used in clinical and laboratory contexts rather than everyday speech; British spelling is 'acidaemia'. Clinicians distinguish acidemia (the measured low blood pH) from acidosis (the underlying process), though the two are often used loosely together.
Easily confused with acidemia
Acidemia refers specifically to low blood pH in the blood itself, whereas acidosis is the broader pathological process or tendency that may cause it — a patient can have acidosis without frank acidemia if compensation is complete.
Anemia is a deficiency of red blood cells or hemoglobin, while acidemia is an excess of acid in the blood; the words share the '-emia' suffix but describe entirely different conditions.