LOINCActiveObservation

LOINC Code 81924-3: Phenylalanine intake 24 hour Estimated

81924-3 is a LOINC code used to identify Phenylalanine intake 24 hour Estimated 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 Phenylalanine intake. It is commonly used with the system or sample type ^Patient.

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 Phenylalanine intake. It is commonly used with the system or sample type ^Patient.

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
  • Method: Estimated

What it does not mean

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

Key facts

  • Phenylalanine intake 24 hour Estimated
  • Phenylalanine intake
  • The patient's estimated 24 hour phenylalanine intake from all sources including food, beverages, and supplements, and via enteral and parenteral routes. This term was created for, but not limited in use to, the Academy of Nutrition and Dietetics' Nutrition Assessment Language.
  • 1 day; 24 hours; 24HR; Diet; Dietetics; Est; estimation; Mass rate; mRate; Nutrition; Phe; Phe intake; Phenylketonuria; PKU; PPA; QNT; Quan; Quant; Quantitative

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

Phenylalanine intake 24 hour EstimatedPhe intake 24h EstPhenylalanine intakeNUTRITION&DIETETICSMRat24H^Patient

Frequently asked questions

Code details

Code81924-3
SystemLOINC
Display namePhenylalanine intake 24 hour Estimated
DescriptionPhenylalanine intake
Short namePhe intake 24h Est
ComponentPhenylalanine intake
PropertyMRat
Timing24H
System (specimen)^Patient
ScaleQn
MethodEstimated
ClassNUTRITION&DIETETICS
Example unitsmg/24 H
StatusACTIVE
Order/ObservationObservation

Flags

BillableNo
Valid clinical useNo

Source

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

Part names

Phenylalanine intakeMRat24H^PatientQnEstimatedMass Rate24 hours

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.