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.

LOINCActiveBoth

LOINC Code 74301-3: Succinylacetone post therapeutic diet (DBS) [Moles/Vol]

Name: LOINC Code 74301-3: Succinylacetone post therapeutic diet (DBS) [Moles/Vol]
Creator: HealthAssure Clinical Team
Published: 2026-05-21T08:59:53.975Z

74301-3 is a LOINC code used to identify Succinylacetone post therapeutic diet (DBS) [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 Succinylacetone^post therapeutic diet. 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 Succinylacetone^post therapeutic diet. 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: Both

What it does not mean

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

Key facts

Succinylacetone [Moles/volume] in DBS --post therapeutic diet

Succinylacetone^post therapeutic diet

This test measures the succinylacetone (SUAC) level in children who have been diagnosed with phenylketonuria or tyrosinemia and are on a therapeutic diet for their condition. The parent of the patient collects the dried blood spot specimen at home and sends it to the laboratory. The succinylacetone level is used in combination with tyrosine and phenylalanine levels to monitor the patient's progress. Notedifferent locations use different monitoring analytes. In some states, tyrosine and phenylalanine levels are used in conjunction with the ratio of tyrosine to phenylalanine or vice versa, depending on the condition, instead of SUAC.

After; Blood; CHEMISTRY.CHALLENGE TESTING; DBS; Dried blood spot; Filter paper; FP; Level; p diet; Point in time; PST; QNT; Quan; Quant; Quantitative; Random; SA; SUAC; Substance concentration; Ther; 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

Succinylacetone post therapeutic diet (DBS) [Moles/Vol]Succinylacetone [Moles/volume] in DBS --post therapeutic dietSuccinylacetone p diet DBS-sCncSuccinylacetone^post therapeutic dietCHALSuccinylacetone after Therapeutic Diet, Dried blood spotSCnc

Frequently asked questions

Code details

Code74301-3

SystemLOINC

Display nameSuccinylacetone post therapeutic diet (DBS) [Moles/Vol]

DescriptionSuccinylacetone^post therapeutic diet

Short nameSuccinylacetone p diet DBS-sCnc

ComponentSuccinylacetone^post therapeutic diet

PropertySCnc

TimingPt

System (specimen)Bld.dot

ScaleQn

ClassCHAL

Example unitsumol/L

StatusACTIVE

Order/ObservationBoth

Flags

BillableNo

Valid clinical useNo

Source

SourceLOINC

Version2.82

Releasemain

First released2.46

Last changed2.61

Consumer names

Succinylacetone after Therapeutic Diet, Dried blood spot

Part names

Succinylacetone^post therapeutic dietSCncPtBld.dotQnSubstance ConcentrationPoint 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.