According to MDS guidelines, a clinically significant weight gain is defined as which threshold?

• A. 5% in 1 month
• B. 2% in 1 month
• C. 5% in 3 months
• D. 15% in 6 months

Answer: (A)

Weight change is used in MDS nutrition assessment to flag meaningful shifts in a resident’s status that may require investigation. A gain of about 5% in one month is the threshold because this amount is large enough to exceed typical measurement error and normal day-to-day fluctuation, yet rapid enough to signal a true change in body weight or fluid balance. In older adults, such a shift can reflect edema or fluid retention, but it can also indicate other acute changes like illness, medication effects, or changes in intake. Detecting a 5% gain within 30 days prompts timely assessment and possible intervention to prevent complications. Smaller changes are more likely to be noise, and waiting for a larger change over several months may delay needed action.