| OLA | left occipitoanterior [fetal position] [Lat. occipito-laeva anterior]; oligonucleotide ligation assa... |
|---|---|
| OLP | left occipitoposterior [fetal position] [Lat. occipito-laeva posterior] |
| OLT | left occipitotransverse [fetal position] [Lat. occipito-laeva transversa]; orthotopic liver transpla... |
| OPS | operations; optical position sensor; osteoporosis-pseudolipoma syndrome; outpatient service; outpati... |
| PDH | past dental history; phosphate dehydrogenase; position-of-the-dynamometer-handle [test]; progressive... |