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LOINC Code 77010-7: Urea post dialysis/pre dialysis [Molar ratio]

77010-7 is a LOINC code used to identify Urea post dialysis/pre dialysis [Molar 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 Urea^post dialysis/pre dialysis. It is commonly used with the system or sample type 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 Urea^post dialysis/pre dialysis. It is commonly used with the system or sample type 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: Both

What it does not mean

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

Key facts

Urea [Molar ratio] in Serum or Plasma --post dialysis/pre dialysis
Urea^post dialysis/pre dialysis
The urea reduction ratio (URR) is a measure of urea clearance during hemodialysis and is calculated based on pre- and post-hemodialysis measurements of blood urea. The URR is directly associated with survival for patients on chronic hemodialysis (a higher URR is associated with lower risk of mortality). Urea clearance is routinely recorded and used to monitor the adequacy of hemodialysis and to compare the quality of hemodialysis delivery across dialysis facilities. [PMID10727547]
After; Before; CHEMISTRY.CHALLENGE TESTING; Dialy; p dialysis; Pl; Plasma; Plsm; Point in time; post/pre dialysis; PST; QNT; Quan; Quant; Quantitative; Random; Scrto; SerP; SerPl; SerPlas; Serum; Serum or plasma; SR; Substance concentration ratio; Substance ratio

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

Urea post dialysis/pre dialysis [Molar ratio]Urea [Molar ratio] in Serum or Plasma --post dialysis/pre dialysisUrea post/pre dialysis SerPl-sRtoUrea^post dialysis/pre dialysisCHALUrea after Dialysis/pre Dialysis, BloodSRto

Frequently asked questions

Code details

Code77010-7
SystemLOINC
Display nameUrea post dialysis/pre dialysis [Molar ratio]
DescriptionUrea^post dialysis/pre dialysis
Short nameUrea post/pre dialysis SerPl-sRto
ComponentUrea^post dialysis/pre dialysis
PropertySRto
TimingPt
System (specimen)Ser/Plas
ScaleQn
ClassCHAL
Example unitsmmol/mmol
StatusACTIVE
Order/ObservationBoth

Flags

BillableNo
Valid clinical useNo

Source

SourceLOINC
Version2.82
Releasemain
First released2.52
Last changed2.52

Consumer names

Urea after Dialysis/pre Dialysis, Blood

Part names

Urea^post dialysis/pre dialysisSRtoPtSer/PlasQnSubstance RatioPoint in time (spot)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.

LOINC Code 77010-7 | HealthAssure