LOINC

LOINC Code 4526-0: Complement protein (P)

4526-0 is a LOINC code used to identify Complement protein (P) 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 Complement protein. It is commonly used with the system or sample type Plas.

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 Complement protein. It is commonly used with the system or sample type Plas.

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: DEPRECATED

What it does not mean

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

Key facts

  • Deprecated Complement protein
  • Complement protein
  • Comp; Complmt; HEMATOLOGY/CELL COUNTS; Pl; Plasma; Plsm; Point in time; PR; Prot; QNT; Quan; Quant; Quantitative; Random

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

Complement protein (P)Deprecated Complement proteinDeprecated Complement protein Plas QnComplement proteinHEM/BCComplement Protein, Blood-

Frequently asked questions

Code details

Code4526-0
SystemLOINC
Display nameComplement protein (P)
DescriptionComplement protein
Short nameDeprecated Complement protein Plas Qn
ComponentComplement protein
Property-
TimingPt
System (specimen)Plas
ScaleQn
ClassHEM/BC
StatusDEPRECATED

Flags

BillableNo
Valid clinical useNo

Source

SourceLOINC
Version2.82
Releasemain
First released1.0
Last changed2.66

Consumer names

Complement Protein, Blood

Part names

Complement protein-PtPlasQnPoint in time (spot)Plasma

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 4526-0 | HealthAssure