Observation.referenceRange

Guidance on how to interpret the value by comparison to a normal or recommended range. Multiple reference ranges are interpreted as an "OR". In other words, to represent two distinct target populations, two `referenceRange` elements would be used.

= Must Support, = Is Modifier, = QiCore defined extension

Field	Card.	Type	Description
low	0..1	Quantity	The value of the low bound of the reference range. The low bound of the reference range endpoint is inclusive of the value (e.g. reference range is >=5 - <=9). If the low bound is omitted, it is assumed to be meaningless (e.g. reference range is <=2.3).
high	0..1	Quantity	The value of the high bound of the reference range. The high bound of the reference range endpoint is inclusive of the value (e.g. reference range is >=5 - <=9). If the high bound is omitted, it is assumed to be meaningless (e.g. reference range is >= 2.3).
type	0..1	Concept	Codes to indicate the what part of the targeted reference population it applies to. For example, the normal or therapeutic range. Binding: Code for the meaning of a reference range. (preferred)
appliesTo	0..*	List<Concept>	Codes to indicate the target population this reference range applies to. For example, a reference range may be based on the normal population or a particular sex or race. Multiple `appliesTo` are interpreted as an "AND" of the target populations. For example, to represent a target population of African American females, both a code of female and a code for African American would be used. Binding: Codes identifying the population the reference range applies to. (example)
age	0..1	Interval<Quantity>	The age at which this reference range is applicable. This is a neonatal age (e.g. number of weeks at term) if the meaning says so.