LOINCActiveObservation

LOINC Code 53392-7: Proline/Phenylalanine (DBS) [Molar ratio]

53392-7 is a LOINC code used to identify Proline/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 Proline/Phenylalanine. It is commonly used with the system or sample type Bld.dot.

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 Proline/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

  • Proline/Phenylalanine [Molar ratio] in DBS
  • Proline/Phenylalanine
  • Blood; Chemistry; DBS; Dried blood spot; Filter paper; FP; Phe; PKU; Point in time; PPA; Pro; 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

Proline/Phenylalanine (DBS) [Molar ratio]Proline/Phenylalanine [Molar ratio] in DBSProline/Phe DBS-sRtoProline/PhenylalanineCHEMProline/Phenylalanine, Dried blood spotSRto

Frequently asked questions

Code details

Code53392-7
SystemLOINC
Display nameProline/Phenylalanine (DBS) [Molar ratio]
DescriptionProline/Phenylalanine
Short nameProline/Phe DBS-sRto
ComponentProline/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

Proline/Phenylalanine, Dried blood spot

Part names

Proline/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.

LOINC Code 53392-7 | HealthAssure