LOINCActiveBoth

LOINC Code 76322-7: Systolic time ratio

76322-7 is a LOINC code used to identify Systolic time 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 Systolic time ratio. It is commonly used with the system or sample type Heart.

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 Systolic time ratio. It is commonly used with the system or sample type Heart.

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

  • Systolic time ratio
  • The ratio of the electrical and mechanical systole duration (PEP/LVET). [IEEE]
  • Cardiac; Cardio; Cardiology; CARDIO-PULM; Heart Disease; Hrt; Lung; Point in time; Pulmonary; Pulmonology; QNT; Quan; Quant; Quantitative; Random; Respiratory; Sys time; Sys time rto; Time ratio

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

Systolic time ratioSys time rtoCARDIO-PULMTRtoPtHeartQn

Frequently asked questions

Code details

Code76322-7
SystemLOINC
Display nameSystolic time ratio
Short nameSys time rto
ComponentSystolic time ratio
PropertyTRto
TimingPt
System (specimen)Heart
ScaleQn
ClassCARDIO-PULM
Example unitsratio
StatusACTIVE
Order/ObservationBoth

Flags

BillableNo
Valid clinical useNo

Source

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

Part names

Systolic time ratioTRtoPtHeartQnTime RatioPoint in time (spot)

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 76322-7 | HealthAssure