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LOINC Code 79265-5: Urea nitrogen overnight dwell (Perit dial fld) [Moles/Vol]

79265-5 is a LOINC code used to identify Urea nitrogen overnight dwell (Perit dial fld) [Moles/Vol] 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 nitrogen^overnight dwell. It is commonly used with the system or sample type Dial fld prt.

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 nitrogen^overnight dwell. It is commonly used with the system or sample type Dial fld prt.

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 nitrogen [Moles/volume] in Peritoneal dialysis fluid --overnight dwell
Urea nitrogen^overnight dwell
A Peritoneal Equilibration Test (PET) is used to assess transport properties of the peritoneal membrane in patients undergoing peritoneal dialysis. Patients arrive at the dialysis unit in the morning with their overnight dwell fluid still in the abdomen. The overnight fluid is completely drained and sampled for testing. In the classic PET, 2000 ml of a 2.27% glucose solution is instilled and peritoneal dialysis is begun. Ten ml samples are drawn at time 0, 2, and 4 hours to measure creatinine, urea, and glucose. The PET assesses the rate of solute equilibration between peritoneal capillary blood and dialysate based on the ratio of the solute concentrations in dialysate and plasma (D/P). PET results are used to adjust various aspects of a patient's peritoneal dialysis regimen, including dwell time, number of exchanges, and dialysis volume and composition. [PMID7474677]
Blood urea nitrogen; CHEMISTRY.CHALLENGE TESTING; Diaf; DiafP; Dialysate; Dialysis fluid; Level; N; N2; Nit; Ovrngt Dwell; Peritoneal Dialysis fluid; Point in time; QNT; Quan; Quant; Quantitative; Random; Substance concentration; UN

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 nitrogen overnight dwell (Perit dial fld) [Moles/Vol]Urea nitrogen [Moles/volume] in Peritoneal dialysis fluid --overnight dwellUrea nit Ovrngt Dwell DiafP-sCncUrea nitrogen^overnight dwellCHALUrea Nitrogen (BUN) Overnight Dwell, Peritoneal dialysis fluidSCnc

Frequently asked questions

Code details

Code79265-5
SystemLOINC
Display nameUrea nitrogen overnight dwell (Perit dial fld) [Moles/Vol]
DescriptionUrea nitrogen^overnight dwell
Short nameUrea nit Ovrngt Dwell DiafP-sCnc
ComponentUrea nitrogen^overnight dwell
PropertySCnc
TimingPt
System (specimen)Dial fld prt
ScaleQn
ClassCHAL
Example unitsmmol/L
StatusACTIVE
Order/ObservationBoth

Flags

BillableNo
Valid clinical useNo

Source

SourceLOINC
Version2.82
Releasemain
First released2.54
Last changed2.56

Consumer names

Urea Nitrogen (BUN) Overnight Dwell, Peritoneal dialysis fluid

Part names

Urea nitrogen^overnight dwellSCncPtDial fld prtQnSubstance ConcentrationPoint in time (spot)Dialysis fluid peritoneal

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 79265-5 | HealthAssure