Seven Levels

• Before HL7, there was a lack of coordination at all levels:

• 1. organization or structure of medical data

  e.g., a patient has a name, age, gender, ...
  

• 2. vocabulary used to express concepts

  e.g., "potassium" vs. "serum potassium" vs. "K"
  

• 4. what can you do with the data

  e.g., query, update
  

• 5. high level protocol

  e.g., solicited vs unsolicited data transfer
  

• 6. how to encode the information for transmission

  e.g., what actually crosses the network
  

• 7. low-level communications protocols (bit level)

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