LOINCActiveObservation

LOINC Code 55404-8: Asthma spells per week

55404-8 is a LOINC code used to identify Asthma spells per week 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 Asthma spells. 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 Asthma spells. 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: Observation

What it does not mean

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

Key facts

  • Asthma spells per week
  • Asthma spells
  • 1 week; Count/time; Lung; nRate; Number rate; Number Rate = Count/Time; PULMONARY; Pulmonology; QNT; Quan; Quant; Quantitative; Respiratory

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

Asthma spells per weekAsthma spells 1W nRateAsthma spellsPULMNRat1W^Patient

Frequently asked questions

Code details

Code55404-8
SystemLOINC
Display nameAsthma spells per week
DescriptionAsthma spells
Short nameAsthma spells 1W nRate
ComponentAsthma spells
PropertyNRat
Timing1W
System (specimen)^Patient
ScaleQn
ClassPULM
Example units/wk
StatusACTIVE
Order/ObservationObservation

Flags

BillableNo
Valid clinical useNo

Source

SourceLOINC
Version2.82
Releasemain
First released2.27
Last changed2.70

Part names

Asthma spellsNRat1W^PatientQnNumber Rate1 week

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 55404-8 | HealthAssure