What does this LOINC code represent?

This LOINC code identifies a lab observation, measurement, question, or clinical concept in a standardized format.

Is this enough to understand my test result?

No. The code identifies the test or observation, but the interpretation depends on the actual result, reference range, and clinical context.

LOINCActiveObservation

LOINC Code 44715-1: Complement C4/Protein (Syn fld) [Mass ratio]

Name: LOINC Code 44715-1: Complement C4/Protein (Syn fld) [Mass ratio]
Creator: HealthAssure Clinical Team
Published: 2026-05-25T17:13:11.347Z

44715-1 is a LOINC code used to identify Complement C4/Protein (Syn fld) [Mass ratio] 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 C4/Protein. It is commonly used with the system or sample type Synv fld.

Reviewed by HealthAssure Clinical TeamUpdated 25 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 C4/Protein. It is commonly used with the system or sample type Synv fld.

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

Complement C4/Protein [Mass Ratio] in Synovial fluid
Complement C4/Protein
Beta 1 E-globulin; Comp; Complmt; HEMATOLOGY/CELL COUNTS; Joint aspirate; Joint fld; Joint flu; Joint fluid; Mass concentration ratio; Mass ratio; MCRto; Point in time; PR; Prot; QNT; Quan; Quant; Quantitative; Random; SF; SNV; Syn; Syn fl; Synov; Synovial fluid

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.

Related SNOMED CT concepts

705114005SNOMED CT mapping for Complement C4/Protein (Syn fld) [Mass ratio] (44715-1)

Related observations and tests

SNOMED_CT 705114005high

LOINC Code System

Source: LOINC-SNOMED cooperation package

Common synonyms

Complement C4/Protein (Syn fld) [Mass ratio]Complement C4/Protein [Mass Ratio] in Synovial fluidC4/Prot SnvComplement C4/ProteinHEM/BCComplement C4/Protein, Synovial fluidMRto

Frequently asked questions

Code details

Code44715-1

SystemLOINC

Display nameComplement C4/Protein (Syn fld) [Mass ratio]

DescriptionComplement C4/Protein

Short nameC4/Prot Snv

ComponentComplement C4/Protein

PropertyMRto

TimingPt

System (specimen)Synv fld

ScaleQn

ClassHEM/BC

StatusACTIVE

Order/ObservationObservation

Flags

BillableNo

Valid clinical useNo

Source

SourceLOINC

Version2.82

Releasemain

First released2.17

Last changed2.42

Consumer names

Complement C4/Protein, Synovial fluid

Part names

Complement C4/ProteinMRtoPtSynv fldQnMass RatioPoint in time (spot)Synovial fluid

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.