LOINCActiveObservation

LOINC Code 26615-5: CD55 RBC Ql (Bld)

26615-5 is a LOINC code used to identify CD55 RBC Ql (Bld) 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 Erythrocytes.CD55. It is commonly used with the system or sample type Bld.

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 Erythrocytes.CD55. It is commonly used with the system or sample type Bld.

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: Observation

What it does not mean

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

Key facts

  • CD55 RBC [Presence] in Blood
  • Erythrocytes.CD55
  • Deficiency is associated with PNH.
  • Blood; CD55 RBC; CELL MARKERS; DAF; Decay accelerating factor; Discocytes; Erthrocyte; Erythrocyte; Ordinal; Point in time; PR; QL; Qual; Qualitative; Random; RBC; RBCS; Red blood cell; Red blood cells; Red blood corpuscle; Red blood corpusles; Red cell; Red cells; Screen; WB; Whole blood

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

CD55 RBC Ql (Bld)CD55 RBC [Presence] in BloodCD55 RBC Bld QlErythrocytes.CD55CELLMARKCD55 red blood cells, BloodPrThr

Frequently asked questions

Code details

Code26615-5
SystemLOINC
Display nameCD55 RBC Ql (Bld)
DescriptionErythrocytes.CD55
Short nameCD55 RBC Bld Ql
ComponentErythrocytes.CD55
PropertyPrThr
TimingPt
System (specimen)Bld
ScaleOrd
ClassCELLMARK
StatusACTIVE
Order/ObservationObservation

Flags

BillableNo
Valid clinical useNo

Source

SourceLOINC
Version2.82
Releasemain
First released2.00
Last changed2.73

Consumer names

CD55 red blood cells, Blood

Part names

Erythrocytes.CD55PrThrPtBldOrdCD55 RBCPresence or ThresholdPoint in time (spot)Blood

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.

LOINC Code 26615-5 | HealthAssure