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  1. FHIR Specification Feedback
  2. FHIR-43402

what does average mean?

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    • Icon: Change Request Change Request
    • Resolution: Persuasive with Modification
    • Icon: Medium Medium
    • US Core (FHIR)
    • 7.0.0-ballot
    • Cross-Group Projects
    • STU
    • US Core Average Blood Pressure Profile
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      It is clear from the definition of LOINC 96607-7 that the mean systolic and mean diastolic blood pressure is the Arithmetic mean ( vs a Geometric or Harmonic Mean) and synonymous with the average; in other words, the sum divided by the count.

      Average (mean) Blood Pressure (systolic and diastolic) is the average of two or more blood pressure (BP) readings in a specified time period or according to a specified algorithm or protocol....

      Average is used in the narrative since it is the commonly understood term and used by USCDI

      RE:

      Please clarify that any one of these different interpretations of the word average satisfy the requirement. 

      Decision:

      Will clarify that this profile is protocol agnostic.

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      It is clear from the definition of LOINC 96607-7 that the mean systolic and mean diastolic blood pressure is the Arithmetic mean ( vs a Geometric or Harmonic Mean) and synonymous with the average; in other words, the sum divided by the count. Average (mean) Blood Pressure (systolic and diastolic) is the average of two or more blood pressure (BP) readings in a specified time period or according to a specified algorithm or protocol.... Average is used in the narrative since it is the commonly understood term and used by USCDI RE: Please clarify that any one of these different interpretations of the word average satisfy the requirement.  Decision : Will clarify that this profile is protocol agnostic.
    • Isaac Vetter/Eric Haas: 41-0-1
    • Clarification
    • Non-substantive

    Description

      It's unclear how a developer should calculate the "average" blood pressure. 

      The US Core profile cites “24-hour ambulatory measurement” but only as an example. Is this one of many definitions of average that I need to support to be compliant?

      Looking at the mandated LOINC code (96607-7) suggests three different patterns, and uses the word mean, which, of course is a more precise meaning than the ambiguous term "average"  (e.g. mean vs median and even arithmetic mode!). 

      The USCDIv4 examples add a few more – to 3-day morning and evening home monitoring, clinical encounter repeat average, and 24-hour ambulatory measurement.

      Please clarify that any one of these different interpretations of the word average satisfy the requirement. 

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            Isaac.Vetter Isaac Vetter
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