This code system http://hl7.org/fhir/v2/0490 defines the following codes:

CodeDisplay
EXExpired
QSQuantity not sufficient
RAMissing patient ID number
RBBroken container
RCClotting
RDMissing collection date
REMissing patient name
RHHemolysis
RIIdentification problem
RMLabeling
RNContamination
RPMissing phlebotomist ID
RRImproper storage
RSName misspelling