LOINCActiveBoth

LOINC Code 98909-5: Shock index Calculated

98909-5 is a LOINC code used to identify Shock index Calculated 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 Shock index. It is commonly used with the system or sample type ^Patient.

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 Shock index. It is commonly used with the system or sample type ^Patient.

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
  • Method: Calculated

What it does not mean

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

Key facts

Shock index Calculated
Shock index
The Shock Index (SI) was originally designed for use in emergency (patient in shock) situations, its ease of use has adapted well to predicting prognosis and need for critical care in patients not in shock. SI is an easily calculated ratio (heart rate/systolic blood pressure) that can be used to assess hemodynamics and tissue perfusion. Additionally, in patients with COVID-19, it can be used as a predictor of in-hospital mortality and ICU admission. [PMID34099089] [PMID: 25215048]
Calc; Calculation; CLIN; CLIN.RISK; Point in time; QNT; Quan; Quant; Quantitative; Random; Ratios; Rto; SI

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

Shock index CalculatedSI CalcShock indexCLIN.RISKRatioPt^Patient

Frequently asked questions

Code details

Code98909-5
SystemLOINC
Display nameShock index Calculated
DescriptionShock index
Short nameSI Calc
ComponentShock index
PropertyRatio
TimingPt
System (specimen)^Patient
ScaleQn
MethodCalculated
ClassCLIN.RISK
Example unitsratio
StatusACTIVE
Order/ObservationBoth

Flags

BillableNo
Valid clinical useNo

Source

SourceLOINC
Version2.82
Releasemain
First released2.72
Last changed2.72

Part names

Shock indexRatioPt^PatientQnCalculatedPoint 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 98909-5 | HealthAssure