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 53394-3: 5-Oxoproline+Pipecolate/Phenylalanine (DBS) [Molar ratio]

Name: LOINC Code 53394-3: 5-Oxoproline+Pipecolate/Phenylalanine (DBS) [Molar ratio]
Creator: HealthAssure Clinical Team
Published: 2026-05-21T08:59:36.030Z

53394-3 is a LOINC code used to identify 5-Oxoproline+Pipecolate/Phenylalanine (DBS) [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 5-Oxoproline+Pipecolate/Phenylalanine. It is commonly used with the system or sample type Bld.dot.

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 5-Oxoproline+Pipecolate/Phenylalanine. It is commonly used with the system or sample type Bld.dot.

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

5-Oxoproline+Pipecolate/Phenylalanine [Molar ratio] in DBS
5-Oxoproline+Pipecolate/Phenylalanine
5Oxoproline; Blood; Chemistry; DBS; Dried blood spot; Filter paper; FP; Oxopro; Phe; Pidolate; Pidolic acid; Pipa; Pipecolic acid; PKU; Point in time; PPA; Pyroglutamate; Pyroglutamic acid; QNT; Quan; Quant; Quantitative; Random; Scrto; Substance concentration ratio; Substance ratio; WB; Whole blood

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

5-Oxoproline+Pipecolate/Phenylalanine (DBS) [Molar ratio]5-Oxoproline+Pipecolate/Phenylalanine [Molar ratio] in DBS5-Oxoproline+Pipecolate/Phe DBS-sRto5-Oxoproline+Pipecolate/PhenylalanineCHEM5-Oxoproline+Pipecolate/Phenylalanine, Dried blood spotSRto

Frequently asked questions

Code details

Code53394-3

SystemLOINC

Display name5-Oxoproline+Pipecolate/Phenylalanine (DBS) [Molar ratio]

Description5-Oxoproline+Pipecolate/Phenylalanine

Short name5-Oxoproline+Pipecolate/Phe DBS-sRto

Component5-Oxoproline+Pipecolate/Phenylalanine

PropertySRto

TimingPt

System (specimen)Bld.dot

ScaleQn

ClassCHEM

Example unitsmolar ratio

StatusACTIVE

Order/ObservationObservation

Flags

BillableNo

Valid clinical useNo

Source

SourceLOINC

Version2.82

Releasemain

First released2.24

Last changed2.70

Consumer names

5-Oxoproline+Pipecolate/Phenylalanine, Dried blood spot

Part names

5-Oxoproline+Pipecolate/PhenylalanineSRtoPtBld.dotQnSubstance RatioPoint in time (spot)DBS

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.