30091000175105: decubitus categorie I van rechter enkel (aandoening)

SNOMED CT Concept\Clinical finding (finding)\...

\Finding of limb structure\Disorder of limb (disorder)\Disorder of soft tissue of limb\Disorder of soft tissue of lower limb\Pressure injury of right lower limb (disorder)\Pressure injury of right ankle (disorder)\Pressure injury of right ankle stage I (disorder)
\Finding of limb structure\Disorder of limb (disorder)\Disorder of soft tissue of limb\Disorder of soft tissue of lower limb\Pressure injury of ankle (disorder)\Pressure injury of ankle stage I (disorder)\Pressure injury of right ankle stage I (disorder)
\Finding of limb structure\Disorder of limb (disorder)\Disorder of soft tissue of limb\Disorder of soft tissue of lower limb\Pressure injury of ankle (disorder)\Pressure injury of right ankle (disorder)\Pressure injury of right ankle stage I (disorder)
\Finding of limb structure\Disorder of limb (disorder)\Disorder of lower limb\Disorder of right lower extremity (disorder)\Injury of right lower limb (disorder)\Injury of right ankle (disorder)\Pressure injury of right ankle (disorder)\Pressure injury of right ankle stage I (disorder)
\Finding of limb structure\Disorder of limb (disorder)\Disorder of lower limb\Disorder of right lower extremity (disorder)\Injury of right lower limb (disorder)\Pressure injury of right lower limb (disorder)\Pressure injury of right ankle (disorder)\Pressure injury of right ankle stage I (disorder)
\Finding of limb structure\Disorder of limb (disorder)\Disorder of lower limb\Disorder of free lower limb (disorder)\Injury of free lower limb\Injury of ankle\Injury of right ankle (disorder)\Pressure injury of right ankle (disorder)\Pressure injury of right ankle stage I (disorder)
\Finding of limb structure\Disorder of limb (disorder)\Disorder of lower limb\Disorder of free lower limb (disorder)\Injury of free lower limb\Injury of ankle\Pressure injury of ankle (disorder)\Pressure injury of ankle stage I (disorder)\Pressure injury of right ankle stage I (disorder)
\Finding of limb structure\Disorder of limb (disorder)\Disorder of lower limb\Disorder of free lower limb (disorder)\Injury of free lower limb\Injury of ankle\Pressure injury of ankle (disorder)\Pressure injury of right ankle (disorder)\Pressure injury of right ankle stage I (disorder)
\Finding of limb structure\Disorder of limb (disorder)\Disorder of lower limb\Disorder of free lower limb (disorder)\Disorder of ankle (disorder)\Injury of ankle\Injury of right ankle (disorder)\Pressure injury of right ankle (disorder)\Pressure injury of right ankle stage I (disorder)
\Finding of limb structure\Disorder of limb (disorder)\Disorder of lower limb\Disorder of free lower limb (disorder)\Disorder of ankle (disorder)\Injury of ankle\Pressure injury of ankle (disorder)\Pressure injury of ankle stage I (disorder)\Pressure injury of right ankle stage I (disorder)
\Finding of limb structure\Disorder of limb (disorder)\Disorder of lower limb\Disorder of free lower limb (disorder)\Disorder of ankle (disorder)\Injury of ankle\Pressure injury of ankle (disorder)\Pressure injury of right ankle (disorder)\Pressure injury of right ankle stage I (disorder)
\Finding of limb structure\Disorder of limb (disorder)\Disorder of lower limb\Disorder of soft tissue of lower limb\Pressure injury of right lower limb (disorder)\Pressure injury of right ankle (disorder)\Pressure injury of right ankle stage I (disorder)
\Finding of limb structure\Disorder of limb (disorder)\Disorder of lower limb\Disorder of soft tissue of lower limb\Pressure injury of ankle (disorder)\Pressure injury of ankle stage I (disorder)\Pressure injury of right ankle stage I (disorder)
\Finding of limb structure\Disorder of limb (disorder)\Disorder of lower limb\Disorder of soft tissue of lower limb\Pressure injury of ankle (disorder)\Pressure injury of right ankle (disorder)\Pressure injury of right ankle stage I (disorder)
\Finding of limb structure\Disorder of limb (disorder)\Disorder of lower limb\Injury of lower limb\Injury of right lower limb (disorder)\Injury of right ankle (disorder)\Pressure injury of right ankle (disorder)\Pressure injury of right ankle stage I (disorder)
\Finding of limb structure\Disorder of limb (disorder)\Disorder of lower limb\Injury of lower limb\Injury of right lower limb (disorder)\Pressure injury of right lower limb (disorder)\Pressure injury of right ankle (disorder)\Pressure injury of right ankle stage I (disorder)
\Finding of limb structure\Disorder of limb (disorder)\Disorder of lower limb\Injury of lower limb\Injury of free lower limb\Injury of ankle\Injury of right ankle (disorder)\Pressure injury of right ankle (disorder)\Pressure injury of right ankle stage I (disorder)
\Finding of limb structure\Disorder of limb (disorder)\Disorder of lower limb\Injury of lower limb\Injury of free lower limb\Injury of ankle\Pressure injury of ankle (disorder)\Pressure injury of ankle stage I (disorder)\Pressure injury of right ankle stage I (disorder)
\Finding of limb structure\Disorder of limb (disorder)\Disorder of lower limb\Injury of lower limb\Injury of free lower limb\Injury of ankle\Pressure injury of ankle (disorder)\Pressure injury of right ankle (disorder)\Pressure injury of right ankle stage I (disorder)
\Finding of limb structure\Finding of lower limb\Finding of ankle or foot (finding)\Finding of ankle region\Disorder of ankle (disorder)\Injury of ankle\Injury of right ankle (disorder)\Pressure injury of right ankle (disorder)\Pressure injury of right ankle stage I (disorder)
\Finding of limb structure\Finding of lower limb\Finding of ankle or foot (finding)\Finding of ankle region\Disorder of ankle (disorder)\Injury of ankle\Pressure injury of ankle (disorder)\Pressure injury of ankle stage I (disorder)\Pressure injury of right ankle stage I (disorder)
\Finding of limb structure\Finding of lower limb\Finding of ankle or foot (finding)\Finding of ankle region\Disorder of ankle (disorder)\Injury of ankle\Pressure injury of ankle (disorder)\Pressure injury of right ankle (disorder)\Pressure injury of right ankle stage I (disorder)
\Finding of limb structure\Finding of lower limb\Disorder of lower limb\Disorder of right lower extremity (disorder)\Injury of right lower limb (disorder)\Injury of right ankle (disorder)\Pressure injury of right ankle (disorder)\Pressure injury of right ankle stage I (disorder)
\Finding of limb structure\Finding of lower limb\Disorder of lower limb\Disorder of right lower extremity (disorder)\Injury of right lower limb (disorder)\Pressure injury of right lower limb (disorder)\Pressure injury of right ankle (disorder)\Pressure injury of right ankle stage I (disorder)
\Finding of limb structure\Finding of lower limb\Disorder of lower limb\Disorder of free lower limb (disorder)\Injury of free lower limb\Injury of ankle\Injury of right ankle (disorder)\Pressure injury of right ankle (disorder)\Pressure injury of right ankle stage I (disorder)
\Finding of limb structure\Finding of lower limb\Disorder of lower limb\Disorder of free lower limb (disorder)\Injury of free lower limb\Injury of ankle\Pressure injury of ankle (disorder)\Pressure injury of ankle stage I (disorder)\Pressure injury of right ankle stage I (disorder)
\Finding of limb structure\Finding of lower limb\Disorder of lower limb\Disorder of free lower limb (disorder)\Injury of free lower limb\Injury of ankle\Pressure injury of ankle (disorder)\Pressure injury of right ankle (disorder)\Pressure injury of right ankle stage I (disorder)
\Finding of limb structure\Finding of lower limb\Disorder of lower limb\Disorder of free lower limb (disorder)\Disorder of ankle (disorder)\Injury of ankle\Injury of right ankle (disorder)\Pressure injury of right ankle (disorder)\Pressure injury of right ankle stage I (disorder)
\Finding of limb structure\Finding of lower limb\Disorder of lower limb\Disorder of free lower limb (disorder)\Disorder of ankle (disorder)\Injury of ankle\Pressure injury of ankle (disorder)\Pressure injury of ankle stage I (disorder)\Pressure injury of right ankle stage I (disorder)
\Finding of limb structure\Finding of lower limb\Disorder of lower limb\Disorder of free lower limb (disorder)\Disorder of ankle (disorder)\Injury of ankle\Pressure injury of ankle (disorder)\Pressure injury of right ankle (disorder)\Pressure injury of right ankle stage I (disorder)
\Finding of limb structure\Finding of lower limb\Disorder of lower limb\Disorder of soft tissue of lower limb\Pressure injury of right lower limb (disorder)\Pressure injury of right ankle (disorder)\Pressure injury of right ankle stage I (disorder)
\Finding of limb structure\Finding of lower limb\Disorder of lower limb\Disorder of soft tissue of lower limb\Pressure injury of ankle (disorder)\Pressure injury of ankle stage I (disorder)\Pressure injury of right ankle stage I (disorder)
\Finding of limb structure\Finding of lower limb\Disorder of lower limb\Disorder of soft tissue of lower limb\Pressure injury of ankle (disorder)\Pressure injury of right ankle (disorder)\Pressure injury of right ankle stage I (disorder)
\Finding of limb structure\Finding of lower limb\Disorder of lower limb\Injury of lower limb\Injury of right lower limb (disorder)\Injury of right ankle (disorder)\Pressure injury of right ankle (disorder)\Pressure injury of right ankle stage I (disorder)
\Finding of limb structure\Finding of lower limb\Disorder of lower limb\Injury of lower limb\Injury of right lower limb (disorder)\Pressure injury of right lower limb (disorder)\Pressure injury of right ankle (disorder)\Pressure injury of right ankle stage I (disorder)
\Finding of limb structure\Finding of lower limb\Disorder of lower limb\Injury of lower limb\Injury of free lower limb\Injury of ankle\Injury of right ankle (disorder)\Pressure injury of right ankle (disorder)\Pressure injury of right ankle stage I (disorder)
\Finding of limb structure\Finding of lower limb\Disorder of lower limb\Injury of lower limb\Injury of free lower limb\Injury of ankle\Pressure injury of ankle (disorder)\Pressure injury of ankle stage I (disorder)\Pressure injury of right ankle stage I (disorder)
\Finding of limb structure\Finding of lower limb\Disorder of lower limb\Injury of lower limb\Injury of free lower limb\Injury of ankle\Pressure injury of ankle (disorder)\Pressure injury of right ankle (disorder)\Pressure injury of right ankle stage I (disorder)

\General finding of soft tissue\Disorder of soft tissue\...

\Soft tissue injury\Pressure injury\...

\Pressure injury of right lower limb (disorder)\Pressure injury of right ankle (disorder)\Pressure injury of right ankle stage I (disorder)

\Pressure injury stage I (disorder)\Pressure injury of ankle stage I (disorder)\Pressure injury of right ankle stage I (disorder)

\Pressure injury of ankle (disorder)\Pressure injury of ankle stage I (disorder)\Pressure injury of right ankle stage I (disorder)
\Pressure injury of ankle (disorder)\Pressure injury of right ankle (disorder)\Pressure injury of right ankle stage I (disorder)

\Disorder of soft tissue of limb\Disorder of soft tissue of lower limb\...

\Pressure injury of right lower limb (disorder)\Pressure injury of right ankle (disorder)\Pressure injury of right ankle stage I (disorder)

\Pressure injury of ankle (disorder)\Pressure injury of ankle stage I (disorder)\Pressure injury of right ankle stage I (disorder)
\Pressure injury of ankle (disorder)\Pressure injury of right ankle (disorder)\Pressure injury of right ankle stage I (disorder)

\Soft tissue lesion\Pressure injury\...

\Pressure injury of right lower limb (disorder)\Pressure injury of right ankle (disorder)\Pressure injury of right ankle stage I (disorder)

\Pressure injury stage I (disorder)\Pressure injury of ankle stage I (disorder)\Pressure injury of right ankle stage I (disorder)

\Pressure injury of ankle (disorder)\Pressure injury of ankle stage I (disorder)\Pressure injury of right ankle stage I (disorder)
\Pressure injury of ankle (disorder)\Pressure injury of right ankle (disorder)\Pressure injury of right ankle stage I (disorder)

\Erythema\Pressure injury stage I (disorder)\Pressure injury of ankle stage I (disorder)\Pressure injury of right ankle stage I (disorder)

\Disease\Disorder of joint region\Disorder of ankle (disorder)\Injury of ankle\Injury of right ankle (disorder)\Pressure injury of right ankle (disorder)\Pressure injury of right ankle stage I (disorder)
\Disease\Disorder of joint region\Disorder of ankle (disorder)\Injury of ankle\Pressure injury of ankle (disorder)\Pressure injury of ankle stage I (disorder)\Pressure injury of right ankle stage I (disorder)
\Disease\Disorder of joint region\Disorder of ankle (disorder)\Injury of ankle\Pressure injury of ankle (disorder)\Pressure injury of right ankle (disorder)\Pressure injury of right ankle stage I (disorder)
\Disease\Traumatic or non-traumatic injury (disorder)\Soft tissue injury\Pressure injury\Pressure injury of right lower limb (disorder)\Pressure injury of right ankle (disorder)\Pressure injury of right ankle stage I (disorder)
\Disease\Traumatic or non-traumatic injury (disorder)\Soft tissue injury\Pressure injury\Pressure injury stage I (disorder)\Pressure injury of ankle stage I (disorder)\Pressure injury of right ankle stage I (disorder)
\Disease\Traumatic or non-traumatic injury (disorder)\Soft tissue injury\Pressure injury\Pressure injury of ankle (disorder)\Pressure injury of ankle stage I (disorder)\Pressure injury of right ankle stage I (disorder)
\Disease\Traumatic or non-traumatic injury (disorder)\Soft tissue injury\Pressure injury\Pressure injury of ankle (disorder)\Pressure injury of right ankle (disorder)\Pressure injury of right ankle stage I (disorder)
\Disease\Traumatic or non-traumatic injury (disorder)\Injury of lower limb\Injury of right lower limb (disorder)\Injury of right ankle (disorder)\Pressure injury of right ankle (disorder)\Pressure injury of right ankle stage I (disorder)
\Disease\Traumatic or non-traumatic injury (disorder)\Injury of lower limb\Injury of right lower limb (disorder)\Pressure injury of right lower limb (disorder)\Pressure injury of right ankle (disorder)\Pressure injury of right ankle stage I (disorder)
\Disease\Traumatic or non-traumatic injury (disorder)\Injury of lower limb\Injury of free lower limb\Injury of ankle\Injury of right ankle (disorder)\Pressure injury of right ankle (disorder)\Pressure injury of right ankle stage I (disorder)
\Disease\Traumatic or non-traumatic injury (disorder)\Injury of lower limb\Injury of free lower limb\Injury of ankle\Pressure injury of ankle (disorder)\Pressure injury of ankle stage I (disorder)\Pressure injury of right ankle stage I (disorder)
\Disease\Traumatic or non-traumatic injury (disorder)\Injury of lower limb\Injury of free lower limb\Injury of ankle\Pressure injury of ankle (disorder)\Pressure injury of right ankle (disorder)\Pressure injury of right ankle stage I (disorder)
\Disease\Disorder of limb (disorder)\Disorder of soft tissue of limb\Disorder of soft tissue of lower limb\Pressure injury of right lower limb (disorder)\Pressure injury of right ankle (disorder)\Pressure injury of right ankle stage I (disorder)
\Disease\Disorder of limb (disorder)\Disorder of soft tissue of limb\Disorder of soft tissue of lower limb\Pressure injury of ankle (disorder)\Pressure injury of ankle stage I (disorder)\Pressure injury of right ankle stage I (disorder)
\Disease\Disorder of limb (disorder)\Disorder of soft tissue of limb\Disorder of soft tissue of lower limb\Pressure injury of ankle (disorder)\Pressure injury of right ankle (disorder)\Pressure injury of right ankle stage I (disorder)
\Disease\Disorder of limb (disorder)\Disorder of lower limb\Disorder of right lower extremity (disorder)\Injury of right lower limb (disorder)\Injury of right ankle (disorder)\Pressure injury of right ankle (disorder)\Pressure injury of right ankle stage I (disorder)
\Disease\Disorder of limb (disorder)\Disorder of lower limb\Disorder of right lower extremity (disorder)\Injury of right lower limb (disorder)\Pressure injury of right lower limb (disorder)\Pressure injury of right ankle (disorder)\Pressure injury of right ankle stage I (disorder)
\Disease\Disorder of limb (disorder)\Disorder of lower limb\Disorder of free lower limb (disorder)\Injury of free lower limb\Injury of ankle\Injury of right ankle (disorder)\Pressure injury of right ankle (disorder)\Pressure injury of right ankle stage I (disorder)
\Disease\Disorder of limb (disorder)\Disorder of lower limb\Disorder of free lower limb (disorder)\Injury of free lower limb\Injury of ankle\Pressure injury of ankle (disorder)\Pressure injury of ankle stage I (disorder)\Pressure injury of right ankle stage I (disorder)
\Disease\Disorder of limb (disorder)\Disorder of lower limb\Disorder of free lower limb (disorder)\Injury of free lower limb\Injury of ankle\Pressure injury of ankle (disorder)\Pressure injury of right ankle (disorder)\Pressure injury of right ankle stage I (disorder)
\Disease\Disorder of limb (disorder)\Disorder of lower limb\Disorder of free lower limb (disorder)\Disorder of ankle (disorder)\Injury of ankle\Injury of right ankle (disorder)\Pressure injury of right ankle (disorder)\Pressure injury of right ankle stage I (disorder)
\Disease\Disorder of limb (disorder)\Disorder of lower limb\Disorder of free lower limb (disorder)\Disorder of ankle (disorder)\Injury of ankle\Pressure injury of ankle (disorder)\Pressure injury of ankle stage I (disorder)\Pressure injury of right ankle stage I (disorder)
\Disease\Disorder of limb (disorder)\Disorder of lower limb\Disorder of free lower limb (disorder)\Disorder of ankle (disorder)\Injury of ankle\Pressure injury of ankle (disorder)\Pressure injury of right ankle (disorder)\Pressure injury of right ankle stage I (disorder)
\Disease\Disorder of limb (disorder)\Disorder of lower limb\Disorder of soft tissue of lower limb\Pressure injury of right lower limb (disorder)\Pressure injury of right ankle (disorder)\Pressure injury of right ankle stage I (disorder)
\Disease\Disorder of limb (disorder)\Disorder of lower limb\Disorder of soft tissue of lower limb\Pressure injury of ankle (disorder)\Pressure injury of ankle stage I (disorder)\Pressure injury of right ankle stage I (disorder)
\Disease\Disorder of limb (disorder)\Disorder of lower limb\Disorder of soft tissue of lower limb\Pressure injury of ankle (disorder)\Pressure injury of right ankle (disorder)\Pressure injury of right ankle stage I (disorder)
\Disease\Disorder of limb (disorder)\Disorder of lower limb\Injury of lower limb\Injury of right lower limb (disorder)\Injury of right ankle (disorder)\Pressure injury of right ankle (disorder)\Pressure injury of right ankle stage I (disorder)
\Disease\Disorder of limb (disorder)\Disorder of lower limb\Injury of lower limb\Injury of right lower limb (disorder)\Pressure injury of right lower limb (disorder)\Pressure injury of right ankle (disorder)\Pressure injury of right ankle stage I (disorder)
\Disease\Disorder of limb (disorder)\Disorder of lower limb\Injury of lower limb\Injury of free lower limb\Injury of ankle\Injury of right ankle (disorder)\Pressure injury of right ankle (disorder)\Pressure injury of right ankle stage I (disorder)
\Disease\Disorder of limb (disorder)\Disorder of lower limb\Injury of lower limb\Injury of free lower limb\Injury of ankle\Pressure injury of ankle (disorder)\Pressure injury of ankle stage I (disorder)\Pressure injury of right ankle stage I (disorder)
\Disease\Disorder of limb (disorder)\Disorder of lower limb\Injury of lower limb\Injury of free lower limb\Injury of ankle\Pressure injury of ankle (disorder)\Pressure injury of right ankle (disorder)\Pressure injury of right ankle stage I (disorder)
\Disease\Disorder of soft tissue\Soft tissue injury\Pressure injury\Pressure injury of right lower limb (disorder)\Pressure injury of right ankle (disorder)\Pressure injury of right ankle stage I (disorder)
\Disease\Disorder of soft tissue\Soft tissue injury\Pressure injury\Pressure injury stage I (disorder)\Pressure injury of ankle stage I (disorder)\Pressure injury of right ankle stage I (disorder)
\Disease\Disorder of soft tissue\Soft tissue injury\Pressure injury\Pressure injury of ankle (disorder)\Pressure injury of ankle stage I (disorder)\Pressure injury of right ankle stage I (disorder)
\Disease\Disorder of soft tissue\Soft tissue injury\Pressure injury\Pressure injury of ankle (disorder)\Pressure injury of right ankle (disorder)\Pressure injury of right ankle stage I (disorder)
\Disease\Disorder of soft tissue\Disorder of soft tissue of limb\Disorder of soft tissue of lower limb\Pressure injury of right lower limb (disorder)\Pressure injury of right ankle (disorder)\Pressure injury of right ankle stage I (disorder)
\Disease\Disorder of soft tissue\Disorder of soft tissue of limb\Disorder of soft tissue of lower limb\Pressure injury of ankle (disorder)\Pressure injury of ankle stage I (disorder)\Pressure injury of right ankle stage I (disorder)
\Disease\Disorder of soft tissue\Disorder of soft tissue of limb\Disorder of soft tissue of lower limb\Pressure injury of ankle (disorder)\Pressure injury of right ankle (disorder)\Pressure injury of right ankle stage I (disorder)
\Disease\Disorder of soft tissue\Soft tissue lesion\Pressure injury\Pressure injury of right lower limb (disorder)\Pressure injury of right ankle (disorder)\Pressure injury of right ankle stage I (disorder)
\Disease\Disorder of soft tissue\Soft tissue lesion\Pressure injury\Pressure injury stage I (disorder)\Pressure injury of ankle stage I (disorder)\Pressure injury of right ankle stage I (disorder)
\Disease\Disorder of soft tissue\Soft tissue lesion\Pressure injury\Pressure injury of ankle (disorder)\Pressure injury of ankle stage I (disorder)\Pressure injury of right ankle stage I (disorder)
\Disease\Disorder of soft tissue\Soft tissue lesion\Pressure injury\Pressure injury of ankle (disorder)\Pressure injury of right ankle (disorder)\Pressure injury of right ankle stage I (disorder)

Status: current, Sufficiently defined by necessary conditions definition status (core metadata concept). Date: 30-Nov 2021. Module: SNOMED CT core

Descriptions:

Id Description Lang Type Status Case? Module

4668388016 Pressure injury of right ankle stage I (disorder) en Fully specified name Active Only initial character case insensitive (core metadata concept) SNOMED CT core

4668389012 Pressure injury of right ankle stage 1 en Synonym (core metadata concept) Active Entire term case insensitive (core metadata concept) SNOMED CT core

4668391016 Pressure injury of right ankle stage I en Synonym (core metadata concept) Active Only initial character case insensitive (core metadata concept) SNOMED CT core

13253731000146111 decubitus categorie I van rechter enkel (aandoening) nl Fully specified name Active Only initial character case insensitive (core metadata concept) SNOMED CT Netherlands NRC maintained module (core metadata concept)

13253741000146115 decubitus categorie 1 van rechter enkel nl Synonym (core metadata concept) Active Entire term case insensitive (core metadata concept) SNOMED CT Netherlands NRC maintained module (core metadata concept)

13253751000146117 doorligwond categorie I van rechter enkel nl Synonym (core metadata concept) Active Only initial character case insensitive (core metadata concept) SNOMED CT Netherlands NRC maintained module (core metadata concept)

13253761000146119 decubitus categorie I van rechter enkel nl Synonym (core metadata concept) Active Only initial character case insensitive (core metadata concept) SNOMED CT Netherlands NRC maintained module (core metadata concept)

Expanded Value Set

Outbound Relationships	Type	Target	Active	Characteristic	Refinability	Group	Values
Pressure injury of right ankle stage I (disorder)	Is a	Pressure injury of right ankle (disorder)	true	Inferred relationship	Some
Pressure injury of right ankle stage I (disorder)	Is a	Pressure injury of ankle stage I (disorder)	true	Inferred relationship	Some
Pressure injury of right ankle stage I (disorder)	Finding site	Structure of soft tissue of right ankle (body structure)	true	Inferred relationship	Some	1
Pressure injury of right ankle stage I (disorder)	Associated morphology	Pressure injury stage I (morphologic abnormality)	true	Inferred relationship	Some	1

Inbound Relationships

Type

Active

Source

Characteristic

Refinability

Group

This concept is not in any reference sets