.Data
..Type of observation (code / type)
Cardinality: 1..1
CodeableConcept
Describes what was observed. Sometimes this is called the observation "name".

value must match SNOMED CT: 412726003("Length of gestation at birth (observable entity)") from LOINC Codes (>1000 codes)
codinghas cardinality: 1..1
..Clinically relevant time/time-period for observation
Cardinality: 0..1
dateTime
The time or time-period the observed value is asserted as being true. For biological subjects - e.g. human patients - this is usually called the "physiologically relevant time". This is usually either the time of the procedure or of specimen collection, but very often the source of the date/time is not known, only the date/time itself.

..Component results
Cardinality: 0..1
Group
Some observations have multiple component observations. These component observations are expressed as separate code value pairs that share the same attributes. Examples include systolic and diastolic component observations for blood pressure measurement and multiple component observations for genetics observations.

...Type of component observation (code / type)
Cardinality: 1..1
CodeableConcept
Describes what was observed. Sometimes this is called the observation "code".

value is bound to LOINC Codes (>1000 codes)
codinghas cardinality: 1..1
...Actual component result
Cardinality: 0..1
Quantity
The information determined as a result of making the observation, if the information has a simple value.

code is fixed to 0000034
system is fixed to http://www.ontobee.org/ontology/UO
unit is fixed to week
..Component results
Cardinality: 0..1
Group
Some observations have multiple component observations. These component observations are expressed as separate code value pairs that share the same attributes. Examples include systolic and diastolic component observations for blood pressure measurement and multiple component observations for genetics observations.

...Type of component observation (code / type)
Cardinality: 1..1
CodeableConcept
Describes what was observed. Sometimes this is called the observation "code".

value is bound to LOINC Codes (>1000 codes)
codinghas cardinality: 1..1
...Actual component result
Cardinality: 0..1
Quantity
The information determined as a result of making the observation, if the information has a simple value.

code is fixed to 0000033
system is fixed to http://www.ontobee.org/ontology/UO
unit is fixed to day
.Protocol
..registered | preliminary | final | amended +
Cardinality: 1..1
code
The status of the result value.

value is fixed to final from ObservationStatus (8 codes)
.Context
..Who and/or what the observation is about
Cardinality: 1..1
Reference
The patient, or group of patients, location, or device this observation is about and into whose record the observation is placed. If the actual focus of the observation is different from the subject (or a sample of, part, or region of the subject), the focus element or the code itself specifies the actual focus of the observation.

value must point to a RareLink IPS Patient

doco Documentation for this format