@startuml
autonumber

actor "Laboratory Coordinator" as labC
activate labC

labC -> System ++: validate a Test Result/Diagnosis
System --> labC --: shows a list of to-be validated tests
loop for how many tests the Laboratory Coordinator chooses
labC -> System ++: selects a test from the list
System -->  labC --: displays its data (registration date, chemical analysis date, diagnosis date) and requests to choose if it's valid
end
loop until the Laboratory Coordinator confirms the selected state of the chosen tests
labC ->  System ++: selects the desired state
System --> labC --: shows it and requests a confirmation
labC -> System ++: confirms the selected state
end
System --> labC --: informs about the operation success

@enduml