The doctor has written the prescription
El doctor ha escrito la prescripción
The prescription is written
La prescripción está escrita
The doctor has prepared himself for surgery
El doctor se ha preparado para la cirugía
The doctor has given the diagnosis to the patient
El doctor ha dado el diagnóstico al paciente
The doctor has given it (the diagnosis)
El doctor lo ha dado
Where are direct object pronouns placed?
Before the auxiliary verb
Where are reflexive pronouns placed?
Before the auxiliary verb
Can the past participle be used as an adjective as well?
Yes