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LOINC Code 86904-0: Carboxyhemoglobin/Hemoglobin.total in Arterial blood by Pulse oximetry

86904-0 is a LOINC code used to identify Carboxyhemoglobin/Hemoglobin.total in Arterial blood by Pulse oximetry in laboratory and clinical observation data. You may see this code in lab systems, lab reports, EHR exports, interoperability feeds, or other structured clinical data exchanges. LOINC codes identify tests, measurements, observations, survey items, and clinical questions in a standardized way. It is associated with the component Carboxyhemoglobin/Hemoglobin.total. It is commonly used with the system or sample type BldA.

Reviewed by HealthAssure Clinical TeamUpdated 21 May 2026

What is this code?

LOINC codes identify tests, measurements, observations, survey items, and clinical questions in a standardized way. It is associated with the component Carboxyhemoglobin/Hemoglobin.total. It is commonly used with the system or sample type BldA.

When is it used?

  • Used in lab systems, EHRs, and clinical data exchange.
  • May identify a test, observation, survey item, or clinical document request rather than a diagnosis.
  • Status: ACTIVE
  • Order vs observation: Both
  • Method: Pulse oximetry

What it does not mean

  • The code identifies the observation or test, not the actual result.

Key facts

Carboxyhemoglobin/Hemoglobin.total in Arterial blood by Pulse oximetry
Carboxyhemoglobin/Hemoglobin.total
Used to report the carboxyhemoglobin level as a percent of the total hemoglobin using pulse oximetry. Note that conventional pulse oximeters are not used to measure carboxyhemoglobin because they use two wavelengths of light that does not allow distinction between carboxyhemoglobin, methemoglobin, and oxyhemoglobin. However, newer pulse oximeters use multiple wavelengths (e.g., seven, eight or twelve) that allow separate measurement of carboxyhemoglobin. [PMID21459480]
ABG; ART; Art bld; Art blood; Arterial; Arterial blood; Blood arterial; Carbon monoxide.hemoglobin; Carbonmonoxyhemoglobin; Carbonyl haemoglobin; Carbonyl hemoglobin; Carbonyl Hgb; Carboxyhaemoglobin; Carboxyhemoglob; CO haemoglobin; CO hemoglobin; COHb; COHgb; Haemoglobin; Hb; HbCO; Hemoglobin bound with carbon dioxide; Hgb; Lung; Mass Fraction; Percent; Point in time; PULMONARY; Pulmonology; PulseOx; QNT; Quan; Quant; Quantitative; Random; Respiratory; SpO2; Tot; Totl

Where you may see this code

You may see this code in lab systems, lab reports, EHR exports, interoperability feeds, or other structured clinical data exchanges.

Common synonyms

Carboxyhemoglobin/Hemoglobin.total in Arterial blood by Pulse oximetryCOHgb % BldA PulseOxCarboxyhemoglobin/Hemoglobin.totalPULMMFrPtBldA

Frequently asked questions

Code details

Code86904-0
SystemLOINC
Display nameCarboxyhemoglobin/Hemoglobin.total in Arterial blood by Pulse oximetry
DescriptionCarboxyhemoglobin/Hemoglobin.total
Short nameCOHgb % BldA PulseOx
ComponentCarboxyhemoglobin/Hemoglobin.total
PropertyMFr
TimingPt
System (specimen)BldA
ScaleQn
MethodPulse oximetry
ClassPULM
Example units%
StatusACTIVE
Order/ObservationBoth

Flags

BillableNo
Valid clinical useNo

Source

SourceLOINC
Version2.82
Releasemain
First released2.63
Last changed2.63

Part names

Carboxyhemoglobin/Hemoglobin.totalMFrPtBldAQnPulse oximetryMass fractionPoint in time (spot)Blood arterial

About this content

This page is prepared by HealthAssure's clinical team using official coding standards from LOINC. AI tools assist with drafting explanations, which are then reviewed and verified by healthcare professionals for accuracy. This content is for informational purposes and does not replace professional medical advice. Meet our team.