ExL7

Elixir HL7 quick parsing, mapping, and manipulation library.

Examples

Parsing

hl7 =
  "MSH|^~\\&|ExL7|iWT Health||1|||ORU^R01||T|2.4\r" <>
    "PID|123^MR~456^AN|AttDoc^888^Ross&Bob~RefDoc^999^Hill&Bobby|||||20000119\r" <>
    "OBR|20160315224533|20160124040433+0600\r" <>
    "OBX|1|doc^ricky|diagnosis^flu\r" <>
    "OBX|2|doc^bobby|diganosis^cold"

{:ok, e_message} = ExL7.parse(hl7)

Basic Queries

"ExL7" = ExL7.query(e_message, "MSH|2")
"R01" = ExL7.query(e_message, "MSH|8^1")
["doc^ricky", "doc^bobby"] = ExL7.query(e_message, "OBX[2]")
["flu", "cold"] = ExL7.query(e_message, "OBX|3[1]")

# Matching specific field from a list of repetitions
"999" = ExL7.query(e_message, "PID|2(0,RefDoc)^1")
"Bob" = ExL7.query(e_message, "PID|2(0,AttDoc)^2&1")

Date Queries

Date queries will convert a given date into a UTC timestamp unless otherwise specified.

DateTime Parsing

"20000119" = ExL7.query(e_message, "PID|7")
"2000-01-19 00:00:00" = ExL7.query(e_message, "@PID|7")

"20160315224533" = ExL7.query(e_message, "OBR|1")
"2016-03-15 22:45:33" = ExL7.query(e_message, "@OBR|1")

# Offset converted to UTC is a day earlier
"20160124040433+0600" = ExL7.query(e_message, "OBR|2")
"2016-01-23 22:04:33" = ExL7.query(e_message, "@OBR|2")

DateTime Timezones

"20000119" = ExL7.query(e_message, "PID|7", %ExL7.Query.DateOptions{timezone: "America/Chicago"})
"2000-01-19 06:00:00" = ExL7.query(e_message, "@PID|7", %ExL7.Query.DateOptions{timezone: "America/Chicago"})
"2000-01-18 13:00:00" = ExL7.query(e_message, "@PID|7", %ExL7.Query.DateOptions{timezone: "Australia/Sydney"})

"20160315224533" = ExL7.query(e_message, "OBR|1")
"2016-03-15 22:45:33" = ExL7.query(e_message, "@OBR|1")
"2016-03-16 03:45:33" = ExL7.query(e_message, "@OBR|1", %ExL7.Query.DateOptions{timezone: "America/Chicago"})
"2016-03-15 22:45:33" = ExL7.query(e_message, "@OBR|1", %ExL7.Query.DateOptions{timezone: "America/Chicago", ignore_timezone: true})

# Offset converted to UTC is a day earlier
"20160124040433+0600" = ExL7.query(e_message, "OBR|2")
"2016-01-23 22:04:33" = ExL7.query(e_message, "@OBR|2")

# DateTimes with an offset ignore the timezone property
"2016-01-23 22:04:33" = ExL7.query(e_message, "@OBR|2", %ExL7.Query.DateOptions{timezone: "America/Chicago"})
"2016-01-23 22:04:33" = ExL7.query(e_message, "@OBR|2", %ExL7.Query.DateOptions{timezone: "Australia/Sydney"})

# Ignore the timezone offset
"2016-01-24 04:04:33" = ExL7.query(e_message, "@OBR|2", %ExL7.Query.DateOptions{ignore_timezone: true})

DateTime Formatting

"2000-01-19" = ExL7.query(e_message, "@PID|7", %ExL7.Query.DateOptions{format: "{YYYY}-{0M}-{0D}"})
"2000-01-19 000000" = ExL7.query(e_message, "@PID|7", %ExL7.Query.DateOptions{format: "{YYYY}-{0M}-{0D} {h24}{m}{s}"})

"20160315" = ExL7.query(e_message, "@OBR|1", %ExL7.Query.DateOptions{format: "{YYYY}{0M}{0D}"})
"2016-03-15" = ExL7.query(e_message, "@OBR|1", %ExL7.Query.DateOptions{format: "{YYYY}-{0M}-{0D}"})

String Functions

# Return the original message
"MSH|^....." = ExL7.Message.to_string(e_message)

Acknowledgement

# Start a Sequence Agent to generate sequences (or use your own custom sequences)
{:ok, sequence_pid} = ExL7.Ack.Sequence.start_link()
sequence_id = ExL7.Ack.Sequence.get_next(sequence_pid)

ExL7.Ack.acknowledge(e_message, sequence_id)

ack_config = %ExL7.Ack.Config{}

# App Error Responses
ExL7.Ack.error(ack_config, sequence_id)
ExL7.Ack.error(ack_config, sequence_id, "server down")

ExL7.Ack.default_error(sequence_id)
ExL7.Ack.default_error(sequence_id, "server down")

# App Rejection Responses
ExL7.Ack.reject(ack_config, sequence_id)
ExL7.Ack.reject(ack_config, sequence_id, "bad msh")

ExL7.Ack.default_reject(sequence_id)
ExL7.Ack.default_reject(sequence_id, "bad msh")

# Custom Responses
ExL7.Ack.other(ack_config, sequence_id, "OT")
ExL7.Ack.other(ack_config, sequence_id, "OT", "other reason")

Versioning

Use SemVer for versioning. Still in development.

Acknowledgements

• medic/L7
• iWT Health