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 56557-2: Renin 10 Min post Unsp challenge (P) [Catalytic activity/Vol]

Name: LOINC Code 56557-2: Renin 10 Min post Unsp challenge (P) [Catalytic activity/Vol]
Creator: HealthAssure Clinical Team
Published: 2026-05-21T08:59:38.263Z

56557-2 is a LOINC code used to identify Renin 10 Min post Unsp challenge (P) [Catalytic activity/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 Renin^10M post XXX challenge. It is commonly used with the system or sample type Plas.

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 Renin^10M post XXX challenge. It is commonly used with the system or sample type 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

Renin [Enzymatic activity/volume] in Plasma --10 minutes post XXX challenge
Renin^10M post XXX challenge
10M p chal; Active renin; After; Angiotensin forming enzyme; Angiotensinogenase; Cardio; Cardiology; Catalytic Concentration; CHEMISTRY.CHALLENGE TESTING; Endocrine; Endocrinology; Heart Disease; Kidney; Nephrology; p chal; Pl; Plasma; Plasma renin activity; Plsm; Point in time; PRA; PST; QNT; Quan; Quant; Quantitative; Random; Renal

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

Renin 10 Min post Unsp challenge (P) [Catalytic activity/Vol]Renin [Enzymatic activity/volume] in Plasma --10 minutes post XXX challengeRenin 10M p chal Plas-cCncRenin^10M post XXX challengeCHALRenin 10 min after challenge, BloodCCnc

Frequently asked questions

Code details

Code56557-2

SystemLOINC

Display nameRenin 10 Min post Unsp challenge (P) [Catalytic activity/Vol]

DescriptionRenin^10M post XXX challenge

Short nameRenin 10M p chal Plas-cCnc

ComponentRenin^10M post XXX challenge

PropertyCCnc

TimingPt

System (specimen)Plas

ScaleQn

ClassCHAL

Example unitsng/mL/h

StatusACTIVE

Order/ObservationObservation

Flags

BillableNo

Valid clinical useNo

Source

SourceLOINC

Version2.82

Releasemain

First released2.29

Last changed2.42

Consumer names

Renin 10 min after challenge, Blood

Part names

Renin^10M post XXX challengeCCncPtPlasQnCatalytic ConcentrationPoint in time (spot)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.