| ONP | operating nursing procedure; orthonitrophenyl |
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| OP | occipitoparietal; occipitoposterior; occiput posterior; octapeptide; olfactory peduncle; opening pre... |
| proc | proceedings, procedure; process |
| PROC | GLM general linear model procedure |
| SOP | service-object pair; standard operating procedure |
| fontan procedure | <procedure> A procedure in which total right atrial or total caval blood flow is channeled directly into the pulmonary artery or into a small right ventricle that serves only as a conduit. The principal congenital malformations for which this operation is useful are tricuspid atresia and single ventricle with pulmonary stenosis. (08 Mar 2000) |
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| loop electrocautery excision procedure | Electrocautery excisional biopsy of abnormal cervical tissue. (05 Mar 2000) |