| OS | osteogenic sarcoma |
|---|---|
| OS-EM | ordered subset expectation maximization |
| OSA | Obstructive Sleep Apnea |
| OSA | Osteosarcoma |
| OSA | obstructive sleep apnoea syndrome |
| OSAHS | Obstructive sleep apnea hypopnea syndrome |
| OSAS | Obstructive Sleep Apnea Syndrome |
| OSBP | Oxysterol binding protein |
| OSC | osteocalcin |
| OSC | oxidosqualene cyclase |