Weight Monitoring
Accurate weight monitoring is essential for identifying malnutrition risk early. Regular weighing allows care staff to detect significant weight changes, trigger appropriate interventions, and provide evidence for dietitian referrals. This guidance covers when and how to weigh residents, what constitutes a significant change, and when to escalate concerns.
CQC Requirement: Under Regulation 14 of the Health and Social Care Act 2008, providers must ensure service users receive adequate nutrition and hydration. CQC inspectors will review weight records and MUST screening as evidence of effective nutritional care. Records should demonstrate that weight changes are identified promptly and appropriate action is taken.
Weekly Weighing
When: Residents identified as medium or high malnutrition risk (MUST score ≥ 1)
Actions Required:
- Weigh at the same time of day, ideally before breakfast
- Use the same scales each time — record the scale type and serial number
- Ensure the resident is wearing similar clothing each time
- Record weight to the nearest 0.1 kg
- Plot weight on the weight monitoring chart
- Calculate percentage weight loss from previous recordings
Monthly Weighing
When: Residents at low risk of malnutrition (MUST score 0) and stable weight
Actions Required:
- Weigh monthly at a consistent time
- Record on weight chart
- Compare to previous month's weight
- Re-screen with MUST if any weight change observed
Significant Weight Loss — Urgent Action
When: Unintentional weight loss > 5% in 3 months or > 10% in 6 months
Actions Required:
- Refer to dietitian within 24–48 hours
- Increase frequency of weighing to weekly
- Implement high-risk MUST management plan
- Review and adjust nutritional care plan
- Inform GP and consider medical investigations
- Consider oral nutritional supplements if not already prescribed
- Document all actions in care plan and daily notes
Dietitian Referral Criteria
When: When to refer to a dietitian
Actions Required:
- MUST score of 2 or more (high risk)
- Unintentional weight loss > 5% in 3 months or > 10% in 6 months
- BMI < 18.5
- Difficulty swallowing requiring texture-modified diet
- Poor dietary intake for 5 or more days
- Pressure injuries with nutritional implications
- Resident requiring enteral feeding support
- Complex dietary needs (e.g., renal diet, diabetes management combined with malnutrition)
Recording and Documentation
When: Every weighing occasion
Actions Required:
- Record date, time, and weight in kg
- Note if weight is estimated or measured
- Note any factors affecting weight (oedema, dehydration, clothing)
- Calculate and record percentage weight change
- Update MUST screening score
- Record actions taken in response to weight changes
- Ensure weight is recorded on the care plan and communicated to the team
Key Principles of Weight Monitoring
- 1.Weigh residents using calibrated scales — record the scale type and serial number on the weight chart.
- 2.Ensure consistency: weigh at the same time of day, with similar clothing, and using the same scales each time.
- 3.Significant weight loss is defined as: >5% in 3 months or >10% in 6 months. This triggers an urgent dietitian referral.
- 4.Always note if weight was measured or estimated — estimated weights are less reliable and should be verified as soon as possible.
- 5.Consider factors that may affect weight: oedema, dehydration, recent surgery, or changes in medication.
- 6.Weight monitoring is a team responsibility — all care staff should be trained in correct weighing technique and documentation.
Weight Change Thresholds
| Time Period | Weight Loss | Risk Level | Action Required |
|---|---|---|---|
| 1 week | >1–2% | Monitor closely | Re-weigh in 1 week; increase food monitoring |
| 1 month | >2–3% | Moderate concern | Complete MUST reassessment; consider dietitian referral |
| 3 months | >5% | High risk | Urgent dietitian referral; implement high-risk care plan |
| 6 months | >10% | High risk | Urgent dietitian referral; inform GP; medical investigations |
Based on BAPEN MUST guidelines. Weight loss percentages are cumulative and should be calculated from the baseline weight recorded at admission.
Authoritative Resources
Important Notice:The weight monitoring guidance provided by Care Handbook is for reference only and does not replace professional clinical judgement. Always follow your organisation's policies and consult a registered dietitian or GP when making clinical decisions about nutritional care. Significant weight changes should be reported to the GP and dietitian without delay.