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 66766-7: Albumin in peritoneal fluid/Albumin in Serum or Plasma (Periton fld+S/P) [Relative ratio]

Name: LOINC Code 66766-7: Albumin in peritoneal fluid/Albumin in Serum or Plasma (Periton fld+S/P) [Relative ratio]
Creator: HealthAssure Clinical Team
Published: 2026-05-21T08:59:46.213Z

66766-7 is a LOINC code used to identify Albumin in peritoneal fluid/Albumin in Serum or Plasma (Periton fld+S/P) [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 Albumin.periton fld/Albumin.SerPl. It is commonly used with the system or sample type Periton fld+Ser/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 Albumin.periton fld/Albumin.SerPl. It is commonly used with the system or sample type Periton fld+Ser/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: ACTIVE
Order vs observation: Observation

What it does not mean

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

Key facts

Albumin in peritoneal fluid/Albumin in Serum or Plasma
Albumin.periton fld/Albumin.SerPl
Alb; Alb Prt; Ascites; Ascitic fluid; Ascitis; Chemistry; Periton fld+SerPl; Peritoneal fluid; Pl; Plasma; Plsm; Point in time; Protein.albumin; Prt; QNT; Quan; Quant; Quantitative; Random; Relative ratio; SerP; SerPl; SerPlas; Serum; Serum or plasma; SR

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

Albumin in peritoneal fluid/Albumin in Serum or Plasma (Periton fld+S/P) [Relative ratio]Albumin in peritoneal fluid/Albumin in Serum or PlasmaAlb Prt/SerPlAlbumin.periton fld/Albumin.SerPlCHEMAlbumin in peritoneal fluid/Albumin in Serum Or Plasma, Peritoneal Fluid+BloodRelRto

Frequently asked questions

Code details

Code66766-7

SystemLOINC

Display nameAlbumin in peritoneal fluid/Albumin in Serum or Plasma (Periton fld+S/P) [Relative ratio]

DescriptionAlbumin.periton fld/Albumin.SerPl

Short nameAlb Prt/SerPl

ComponentAlbumin.periton fld/Albumin.SerPl

PropertyRelRto

TimingPt

System (specimen)Periton fld+Ser/Plas

ScaleQn

ClassCHEM

Example unitsRatio

StatusACTIVE

Order/ObservationObservation

Flags

BillableNo

Valid clinical useNo

Source

SourceLOINC

Version2.82

Releasemain

First released2.38

Last changed2.70

Consumer names

Albumin in peritoneal fluid/Albumin in Serum Or Plasma, Peritoneal Fluid+Blood

Part names

Albumin.periton fld/Albumin.SerPlRelRtoPtPeriton fld+Ser/PlasQnRelative RatioPoint in time (spot)Peritoneal fluid and serum or 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.