Appendix B : Acronyms, Abbreviations, and Symbols
Encyclopedia
Updated Jan 16, 2025
B.1 PURPOSE
This Appendix provides guidance, made available in the acronym, abbreviation, and symbol definitions listed below.
B.2 ABBREVIATIONS AND ACRONYMS
| % | percent, percentile |
| ACLS | advanced cardiac life support |
| ATLS | advanced trauma life support |
| ASCR | astronaut strength, conditioning, and rehabilitation specialist |
| ALARA | as low as reasonably achievable |
| ARED | advanced resistive exercise device |
| ART | assisted reproductive technology |
| BFO | blood forming organ(s) |
| BMD | bone mineral density |
| CCP | Commercial Crew Program |
| CDR | commander |
| CEVIS | cycle ergometer with vibrational isolation and stabilization |
| CHOC | crew health operations concept |
| cm | centimeter |
| CMO | crew medical officer |
| CO2 | carbon dioxide |
| COSPAR | Committee for Space Research |
| CPR | cardiopulmonary resuscitation |
| DMCF | definitive medical care facility |
| DOD/DoD | Department of Defense |
| DRM | design reference mission |
| DXA | dual energy x-ray absorptiometry |
| ECLSS | environmental control life support system |
| EMS | emergency medical services |
| EMT | emergency medical technician |
| ETA | estimated time of arrival Engineering Technical Authority |
| EVA | extravehicular activity |
| FAR | Federal Acquisition Regulation |
| FOD | Flight Operations Directorate |
| FFD | fitness for duty |
| FFRDC | Federally Funded Research and Development Center |
| FS | flight surgeon |
| G | gravity |
| GCR | galactic cosmic rays |
| GSP | ground support personnel gravity transitions |
| G-transition | gravity transitions |
| HEOMD | Human Exploration and Operations Mission Directorate |
| HIDH | Human Integration Design Handbook |
| HIDP | Human Integration Design Processes |
| HMTA | Health and Medical Technical Authority |
| Hr | hour |
| HRP | Human Research Program |
| HSP | Health Stabilization Program |
| IMM | integrated medical model |
| ISS | International Space Station |
| ICRP | International Commission on Radiological Protection and Measurements |
| IP | International Partner |
| IV | intravenous |
| JSC | Johnson Space Center |
| kcal | kilocalorie(s) |
| kg | kilogram(s) |
| LE | lower extremity |
| LEO | Low-Earth orbit |
| LET | linear energy transfer |
| m | meter(s) |
| max | maximum |
| MCC | Mission Control Center |
| MED | medical evaluation documents |
| MeV | megaelectron volt |
| mGy | milligray |
| mGy-Eq | milligray‐equivalent |
| min | minute(s) |
| ml | milliliter(s) |
| MORD | Medical Operations Requirements Document |
| MSFC | Marshall Space Flight Center |
| mSv | millisieverts |
| NASA | National Aeronautics and Space Administration |
| NBL | Neutral Buoyancy Laboratory |
| NCRP | National Council on Radiation Protection and Measurements |
| NPD | NASA Policy Directive |
| NPR | NASA Procedural Requirement |
| OCHMO | Office of the Chief Health and Medical Officer |
| OSHA | Occupational Safety and Health Administration |
| PEL | permissible exposure limit |
| PMC | private medical communication/conference |
| POL | permissible outcome limits |
| PPE | personal protective equipment |
| PRA | probabilistic risk assessment |
| PFC | private family conference |
| PPC | private psychological conference |
| PRD | program technical requirements document |
| RBE | relative biological effectiveness |
| REID | risk of exposure-induced death |
| RER | respiratory exchange |
| ROC | receiver operating characteristic |
| SANS | Spaceflight Associated Neuro-Ocular Syndrome |
| SARS-CoV-2 | severe acute respiratory syndrome coronavirus 2 |
| SAS | Space Adaptation Syndrome |
| SD | standard deviation |
| SI | System International or metric system of measurement |
| SMATA | Safety and Mission Assurance Technical Authority |
| SPE | solar particle event |
| SPEL | space permissible exposure limits |
| SSP | Space Station Program |
| STD | standard |
| STS | Space Transportation System |
| TREAT | To Research, Evaluate, Assess, and Treat |
| U.S./US | United States |
| V1 | Volume 1 |
| V2 | Volume 2 |
| VO | volume of oxygen |
