What is the abbreviation for "bed rest"?

The abbreviation for "bed rest" is indeed commonly recognized as "BR." This abbreviation is often used in nursing documentation and communication to indicate that a patient should remain in bed, which is typically prescribed for various health conditions needing reduced activity. This concise representation allows healthcare professionals to convey important information quickly and efficiently, aligning with the need for clear communication in clinical settings.

The other choices do not reflect standard medical abbreviation practices; while "ABR," "REST," and "BEDR" might intuitively relate to the concept of bed rest, they are not widely accepted abbreviations within nursing or medical terminology, thus highlighting the importance of understanding recognized shorthand in clinical practice.