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 32265-1: Phenylalanine/Tyrosine [Molar ratio]

Name: LOINC Code 32265-1: Phenylalanine/Tyrosine [Molar ratio]
Creator: HealthAssure Clinical Team
Published: 2026-05-25T17:13:11.347Z

32265-1 is a LOINC code used to identify Phenylalanine/Tyrosine [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 Phenylalanine/Tyrosine. It is commonly used with the system or sample type Ser/Plas.

Reviewed by HealthAssure Clinical TeamUpdated 25 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/Tyrosine. 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: Observation

What it does not mean

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

Key facts

Phenylalanine/Tyrosine [Molar ratio] in Serum or Plasma
Phenylalanine/Tyrosine
Chemistry; Phe; Phe+Tyr; Phenylalanine +Tyrosine; Pl; Plasma; Plsm; Point in time; PPA; QNT; Quan; Quant; Quantitative; Random; Scrto; SerP; SerPl; SerPlas; Serum; Serum or plasma; SR; Substance concentration ratio; Substance ratio; Tyr

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.

Related SNOMED CT concepts

705114005SNOMED CT mapping for Phenylalanine/Tyrosine [Molar ratio] (32265-1)

Related observations and tests

SNOMED_CT 705114005high

LOINC Code System

Source: LOINC-SNOMED cooperation package

Common synonyms

Phenylalanine/Tyrosine [Molar ratio]Phenylalanine/Tyrosine [Molar ratio] in Serum or PlasmaPhe/Tyr SerPl-sRtoPhenylalanine/TyrosineCHEMPhenylalanine/Tyrosine, BloodSRto

Frequently asked questions

Code details

Code32265-1

SystemLOINC

Display namePhenylalanine/Tyrosine [Molar ratio]

DescriptionPhenylalanine/Tyrosine

Short namePhe/Tyr SerPl-sRto

ComponentPhenylalanine/Tyrosine

PropertySRto

TimingPt

System (specimen)Ser/Plas

ScaleQn

ClassCHEM

Example unitsRatio

StatusACTIVE

Order/ObservationObservation

Flags

BillableNo

Valid clinical useNo

Source

SourceLOINC

Version2.82

Releasemain

First released2.07

Last changed2.70

Consumer names

Phenylalanine/Tyrosine, Blood

Part names

Phenylalanine/TyrosineSRtoPtSer/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.