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LOINC Code 78517-0: Renin 2 Hr post Unsp challenge (P) [Mass/Vol]

78517-0 is a LOINC code used to identify Renin 2 Hr post Unsp challenge (P) [Mass/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^2H 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^2H 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: Both

What it does not mean

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

Key facts

Renin [Mass/volume] in Plasma --2 hours post XXX challenge
Renin^2H post XXX challenge
The most common substance used in a renin challenge is a weight-dependent dose of captopril, an angiotensin converting enzyme inhibitor. In a captopril challenge test (CCT), plasma concentration of renin is measured prior to and following the administration of captopril. A significant increase in the post-dose renin level is abnormal and is a marker for renovascular disease. [WikipediaCaptopril challenge test]
120 min; 120 minutes; 120min; 2 hours; 2h p chal; After; Angiotensin forming enzyme; Angiotensinogenase; CHEMISTRY.CHALLENGE TESTING; Direct renin; DRC; Level; Mass concentration; p chal; Pl; Plasma; Plsm; Point in time; PST; QNT; Quan; Quant; Quantitative; Random

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 2 Hr post Unsp challenge (P) [Mass/Vol]Renin [Mass/volume] in Plasma --2 hours post XXX challengeRenin 2h p chal Plas-mCncRenin^2H post XXX challengeCHALRenin 2 hr after challenge, BloodMCnc

Frequently asked questions

Code details

Code78517-0
SystemLOINC
Display nameRenin 2 Hr post Unsp challenge (P) [Mass/Vol]
DescriptionRenin^2H post XXX challenge
Short nameRenin 2h p chal Plas-mCnc
ComponentRenin^2H post XXX challenge
PropertyMCnc
TimingPt
System (specimen)Plas
ScaleQn
ClassCHAL
Example unitsng/L
StatusACTIVE
Order/ObservationBoth

Flags

BillableNo
Valid clinical useNo

Source

SourceLOINC
Version2.82
Releasemain
First released2.54
Last changed2.54

Consumer names

Renin 2 hr after challenge, Blood

Part names

Renin^2H post XXX challengeMCncPtPlasQnMass 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.