| Abbreviation | Definition |
|---|---|
| MARS | Mobile Automated Regulatory Services (ORA) |
| MASC | Manipulated Autologous Structural Cell |
| MAScell | manipulated autologous structural cell |
| MAT | Modular Antigen Transporter |
| MATS | Management Assignment Tracking System |
| MATTB | Manufacturers Assistance and Technical Training Branch |
| MATTB(CBER) | Manufacturers Assistance and Technical Training Branch (CBER) |
| MAUDE | Manufacturer And User facility Device Experience database |
| MAUDE | Manufacturer and User Facility Device Experience Database (CDRH) |
| MAV | Maximum Allowable Variation |
| MB(CFSAN) | Microanalytical Evaluations Branch of the Center for Food Safety and Applied Nutrition |
| MBC | Minimum Bactericidal Concentration |
| MBES | Medicaid Budget and Expenditure System |
| MCA | Medicines Control Agency (part of MHRA) |
| MCAFT | Modified Canadian Aerobic Fitness Test |
| MCM | medical countermeasure |
| MCM | Medical Counter-Measure |
| MCMi | Medical Countermeasures Initiative |
| MCO | Managed Care Organization |
| MDA | Medical Device Amendments of the Safe Medical Devices Act |