Pre/Post Weights, Target Weight, and Fluid Gains
Key Takeaways
- Pre-treatment weight, post-treatment weight, and target weight guide fluid-removal decisions.
- Interdialytic weight gain is a practical estimate of fluid gained between treatments.
- One kilogram of weight gain is approximately one liter of fluid.
- Target weight is set by the clinical team; technicians measure accurately, verify concerns, and report discrepancies.
Weight data drives fluid planning
Pre-treatment weight is measured before dialysis. Post-treatment weight is measured after dialysis. Target weight is the goal weight ordered by the care team when excess fluid has been removed and the patient is clinically stable.
Interdialytic weight gain is the weight gained between treatments. Because 1 kg is about 1 liter of water, a 2.5 kg gain is about 2.5 liters of fluid before ordered adjustments and facility-specific calculations.
Technician calculation check
If the pre-treatment weight is 74.8 kg and the target weight is 72.8 kg, the patient is 2.0 kg above target. That suggests about 2.0 liters of fluid before accounting for ordered additions, rinseback, prime, or facility policy.
Common weight scenarios
| Scenario | Why it matters | CCHT-safe action |
|---|---|---|
| Weight seems impossible or inconsistent | UF goal may be wrong | Reweigh, verify scale process, and report. |
| Large gain with swelling or shortness of breath | Possible fluid overload and high UF risk | Notify licensed staff and document findings. |
| Post-weight remains above target | Fluid removal may be incomplete | Report and document per policy. |
| Post-weight below target with dizziness | Possible excessive fluid removal | Follow protocol and alert the RN. |
Small weighing errors can become large UF errors. Use the correct scale process, account for facility rules on shoes or equipment, and do not estimate a weight when an actual weight is required.
A patient's pre-treatment weight is 70.5 kg and target weight is 68.5 kg. About how much fluid is the patient above target before ordered adjustments?
A patient says the scale reading is wrong and it does not match recent weights. What should the CCHT do first?
Who determines the patient's target weight?