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.

LOINCActiveBoth

LOINC Code 70264-7: Creatinine in pleural fluid/Creatinine in serum (S/P+Pleur fld) [Relative ratio]

Name: LOINC Code 70264-7: Creatinine in pleural fluid/Creatinine in serum (S/P+Pleur fld) [Relative ratio]
Creator: HealthAssure Clinical Team
Published: 2026-05-21T08:59:49.463Z

70264-7 is a LOINC code used to identify Creatinine in pleural fluid/Creatinine in serum (S/P+Pleur fld) [Relative 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 Creatinine.plr fld/Creatinine.serum. It is commonly used with the system or sample type Ser/Plas+Plr fld.

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 Creatinine.plr fld/Creatinine.serum. It is commonly used with the system or sample type Ser/Plas+Plr 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: Both

What it does not mean

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

Key facts

Creatinine in pleural fluid/Creatinine in serum
Creatinine.plr fld/Creatinine.serum
Pleural fluid to serum creatinine ratio is determined to help diagnose the cause of pleural effusion.
Chemistry; CR; Crea; Creat; Creat Plr; Pl; Plasma; Pleural; Pleural fluid; Plsm; Point in time; QNT; Quan; Quant; Quantitative; Random; Relative ratio; Ser; SerP; SerPl; SerPl+Plr; SerPlas; Serum; Serum or plasma; SR; thoracentesis 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.

Common synonyms

Creatinine in pleural fluid/Creatinine in serum (S/P+Pleur fld) [Relative ratio]Creatinine in pleural fluid/Creatinine in serumCreat Plr/SerCreatinine.plr fld/Creatinine.serumCHEMCreatinine in pleural fluid/Creatinine in Serum, S/P+Pleur FldRelRto

Frequently asked questions

Code details

Code70264-7

SystemLOINC

Display nameCreatinine in pleural fluid/Creatinine in serum (S/P+Pleur fld) [Relative ratio]

DescriptionCreatinine.plr fld/Creatinine.serum

Short nameCreat Plr/Ser

ComponentCreatinine.plr fld/Creatinine.serum

PropertyRelRto

TimingPt

System (specimen)Ser/Plas+Plr fld

ScaleQn

ClassCHEM

Example unitsRatio

StatusACTIVE

Order/ObservationBoth

Flags

BillableNo

Valid clinical useNo

Source

SourceLOINC

Version2.82

Releasemain

First released2.40

Last changed2.44

Consumer names

Creatinine in pleural fluid/Creatinine in Serum, S/P+Pleur Fld

Part names

Creatinine.plr fld/Creatinine.serumRelRtoPtSer/Plas+Plr fldQnRelative RatioPoint in time (spot)Serum or Plasma and Pleural 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.