LOINCActiveBoth

LOINC Code 98910-3: Modified shock index Calculated

98910-3 is a LOINC code used to identify Modified 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 Modified 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 Modified 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

Modified shock index Calculated
Modified shock index
The Modified Shock Index (mSI) originates from the Shock Index (SI) [LOINC98909-5] but also takes diastolic blood pressure into account by using the mean arterial pressure rather than systolic blood pressure as part of the calculation. mSI is calculated as heart rate/mean arterial pressure (mSI=HR/MAP). Both low (<0.6) and high (>1.3) mSI scores are associated with increased mortality. [PMID: 34099089] [PMID: 25215048]
Calc; Calculation; CLIN; CLIN.RISK; mSI; 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

Modified shock index CalculatedmSI CalcModified shock indexCLIN.RISKRatioPt^Patient

Frequently asked questions

Code details

Code98910-3
SystemLOINC
Display nameModified shock index Calculated
DescriptionModified shock index
Short namemSI Calc
ComponentModified shock 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

Modified 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 98910-3 | HealthAssure