| SFIS | structural family interaction scale |
|---|---|
| SI | International System of Units [Fr. le Systeme International d'Unites]; sacroiliac; saline infusion; ... |
| DPA | Dual Photon Absorptiometry |
| DPX | Dual Photon X-Ray |
| SPA | 1) Single Photon Absorptiometry 2) Sperm Penetration Assay |