Version 2.72

1925-7Base excess in Arterial blood by calculationActive

Part Description

LP15429-1   Base excess
Base excess refers to the amount of a strong acid required to bring back the blood pH to the normal value of 7.4. The term and concept were first introduced by Astrup and Siggaard-Andersen in 1958 as a way to measure the metabolic component of an acid-base disturbance.

Actual versus standard:
In vivo, acid-base homeostasis takes place throughout the extracellular fluid (ECF), not just the blood compartment that is in a patient specimen. The concept of "standard" base excess attempts to adjust for the base excess of the entire extracellular compartment by calculating the base excess for blood diluted as if the entire extracellular compartment were sampled (approx Hgb of 5g/l). So the ACTUAL base excess (ABE) is the dose of acid to return PLASMA to normal pH, whereas the STANDARD base excess (SBE) is the dose to return ECF to normal pH.

Adjusting for oxygen saturation:
Base excess normally assumes 100% oxygen saturation, which is valid for many arterial specimens. However, it is possible to add additional terms to the calculation which account for the actual oxygen saturation of the patient sample. The terms in LOINC indicating 'Base excess.100% oxygenated' are intended to encode base excess terms adjusted for oxygen saturation (i.e. do not assume 100% oxygenation). Source: Regenstrief LOINC

Fully-Specified Name

Base excess

Additional Names

Short Name
Base excess BldA Calc-sCnc
Display Name
Base excess Calc (BldA) [Moles/Vol]
Consumer Name Alpha
Base excess, Blood

Basic Attributes

First Released
Version 1.0
Last Updated
Version 2.70
Order vs. Observation
Common US Lab Results Rank
Common SI Lab Results Rank

Member of these Panels

LOINC Long Common Name
52743-2 Continuity Assessment Record and Evaluation (CARE) tool - Acute Care
52748-1 Continuity Assessment Record and Evaluation (CARE) tool - Home Health Admission
52746-5 Continuity Assessment Record and Evaluation (CARE) tool - Interim
52744-0 Continuity Assessment Record and Evaluation (CARE) tool - Post Acute Care (PAC) - Admission
52745-7 Continuity Assessment Record and Evaluation (CARE) tool - Post Acute Care (PAC) - Discharge
93685-6 Gas and Carbon monoxide and Electrolytes panel - Arterial blood
24341-0 Gas and Carbon monoxide panel - Arterial blood
99548-0 Gas and electrolytes panel - Arterial blood
24336-0 Gas panel - Arterial blood

Language Variants Get Info

zh-CNChinese (China)
nl-NLDutch (Netherlands)
base-overschot:mol/volume:moment:arterieel bloed:kwantitatief:berekend
et-EEEstonian (Estonia)
Aluste liig:SCnc:Pt:aB:Qn:Arvutuslik
fr-BEFrench (Belgium)
Excès de base:Concentration de substance:Temps ponctuel:Sang artériel:Quantitatif:Calculé
fr-CAFrench (Canada)
Excès de base:Concentration de substance:Temps ponctuel:Sang artériel:Quantitatif:Calculé
fr-FRFrench (France)
Base excès:Moles/Volume:Ponctuel:Sang artériel:Numérique:Résultat calculé
de-DEGerman (Germany)
Basenüberschuss:Stoffmengenkonzentration:Zeitpunkt:Blut arteriell:Quantitativ:Berechnet
it-ITItalian (Italy)
Basi, eccesso:SCnc:Pt:Sangue art:Qn:Calcolato
ko-KRKorean (Korea, Republic of)
염기 과잉:물질농도:검사시점:동맥혈:정량:
pt-BRPortuguese (Brazil)
Excesso de base:SCnc:Pt:SgArt:Qn:
ru-RURussian (Russian Federation)
Оснований избыток:МолКонц:ТчкВрм:КрА:Колич:Вычисленный
es-ARSpanish (Argentina)
exceso de bases:concentración de sustancia:punto en el tiempo:sangre arterial:cuantitativo:
es-MXSpanish (Mexico)
Exceso de base:Concentración de sustancias:Punto temporal:Sangre arterial:Cuantitativo:Calculado
es-ESSpanish (Spain)
Exceso de base:Concentración de sustancia:Punto temporal:Sangre arterial:Qn:Calculado
tr-TRTurkish (Turkey)
Baz fazlalığı:SubKons:Zmlı:KanArt:Kant:Hesaplanmış

Example Units

Unit Source
mmol/L eCHN
mmol/L Example UCUM Units

LOINC FHIR® API Example - CodeSystem Request Get Info