This code system http://hl7.org/fhir/v2/0258 defines the following codes:

CodeDisplay
BPUBlood product unit
CONTROLControl
DONORDonor
PATIENTPatient

Additional Language Displays

Codenl
BPUBloedproducteenheid
CONTROL
DONORDonor
PATIENTPatiënt