Dry weight, also called target weight, is the estimated post-dialysis weight your doctor has ordered as the goal for treatment. It represents the weight your care team is aiming for when your fluid level is thought to be appropriately balanced after dialysis.
It is not simply your everyday scale weight, and it is not a permanent number that never changes.
Your target weight is part of your dialysis prescription. The dialysis team uses it, along with your pre-treatment weight, your doctor’s orders, your symptoms, and how you tolerate fluid removal, to guide treatment.
What dry weight means in everyday language
When your kidneys are no longer able to remove enough fluid, some of what you drink and some of the fluid contained in food can remain in your body between dialysis treatments.
That retained fluid adds weight.
For example, if your target weight is lower than the number on the scale when you arrive for dialysis, part of that difference may represent fluid that has accumulated since your last treatment.
Dialysis helps remove that excess fluid.
Your dry weight or target weight is the clinical estimate your doctor uses to represent an appropriate post-treatment weight for you.
It is better to think of dry weight as a treatment target rather than a perfectly measurable number.
Dry weight is different from your everyday body weight
One of the most important things to understand is that fluid weight and actual body weight are not the same thing.
Your weight can increase between dialysis treatments because of fluid accumulation.
But your actual body weight can also change over time because of things such as:
- changes in appetite
- improved or reduced nutrition
- illness
- muscle gain or loss
- changes in body fat
- hospitalization or recovery
- changes in overall health
That distinction matters.
If someone genuinely loses body tissue but their target weight remains unchanged, the old target may no longer accurately reflect their current condition.
Likewise, if someone gains healthy body weight, their previous target may eventually need to be reassessed.
This is one reason dry weight should not be thought of as a permanent number.
How target weight is used on treatment day
When you arrive for hemodialysis, you are typically weighed before sitting down for treatment.
The dialysis team compares your pre-treatment weight with the target weight ordered by your doctor.
That difference helps the team understand how much fluid may need to be removed during treatment.
However, the scale difference does not independently determine the fluid-removal goal.
The treatment goal follows your doctor’s prescription and may also depend on clinical factors such as:
- how you are tolerating fluid removal
- your blood pressure
- symptoms during treatment
- your treatment time
- your current medical condition
- whether you still make urine
- fluids you may receive or consume during treatment
- other instructions included in your dialysis prescription
The goal is not simply to make the scale reach a specific number at all costs.
Your response to treatment matters.
Why you are weighed again after dialysis
After treatment, you are usually weighed again.
Your post-treatment weight gives the care team another piece of information about how the treatment went.
They can compare:
- where you started
- how much fluid was removed
- where you finished
- how close you came to the ordered target
- how you felt during and after treatment
Over time, these patterns can help your doctor and dialysis team determine whether the current target weight still appears appropriate.
A single treatment does not tell the whole story. The team usually looks at trends.
Why dry weight is an estimate
There is no simple test that produces one perfectly exact dry-weight number.
Your doctor determines and reassesses the target using the overall clinical picture.
That may include:
- blood pressure trends
- swelling
- breathing symptoms
- how you feel during treatment
- how you feel after treatment
- cramping or dizziness
- changes in your actual body weight
- changes in urine output
- recent illness or hospitalization
- nutritional changes
- your cardiovascular condition
- other clinical findings
Because these things can change, your target weight can change too.
Why your target weight may be adjusted
A change in target weight does not automatically mean something is wrong.
Sometimes your body itself has changed.
For example, someone may:
- lose weight after an illness
- regain weight as appetite improves
- lose muscle over time
- gain muscle or body fat
- begin making less urine
- experience changes in fluid balance
Your doctor may adjust the prescribed target weight as those circumstances change.
The important distinction is that the target should be reassessed clinically rather than changed simply because the scale moved one day.
What patients commonly notice when fluid removal is difficult
Fluid removal is something your body has to tolerate during dialysis.
If fluid is being removed faster or in a greater amount than your body is tolerating well at that time, symptoms can occur.
These may include:
- muscle cramps
- lightheadedness
- dizziness
- weakness
- nausea
- feeling unusually washed out
- a drop in blood pressure
These symptoms do not automatically mean that your dry weight is wrong.
They can have several possible causes, including the amount or rate of fluid removal and other medical factors.
Tell the dialysis staff if you experience symptoms during treatment so they can evaluate what is happening and respond according to your doctor’s orders and your clinical condition.
What may happen if you are carrying extra fluid
If more fluid remains in the body than is appropriate for you, possible signs can include:
- swelling in the feet, ankles, legs, hands, or around the eyes
- shortness of breath
- higher blood pressure
- feeling unusually full or heavy
- difficulty lying flat in some cases
These symptoms can have causes other than fluid accumulation, so they should not be self-diagnosed.
Report new or worsening symptoms to your dialysis care team.
What happens if you do not reach your target weight?
There may be treatments when your post-dialysis weight does not reach the ordered target.
That can happen for several reasons.
- your blood pressure may fall
- you may develop cramping or dizziness
- the treatment may need to end early
- your body may not tolerate additional fluid removal
- the prescribed treatment parameters may limit how much can safely be removed during that session
- your target weight may need clinical reassessment
Not reaching target weight on one treatment does not automatically mean the treatment failed.
The dialysis team has to balance the prescribed fluid-removal goal with how you are tolerating treatment.
If this happens repeatedly, it is worth discussing with your nurse and nephrologist.
What does “interdialytic weight gain” mean?
You may hear the term interdialytic weight gain, sometimes shortened to IDWG.
It means the increase in your weight between dialysis treatments.
A substantial portion of that increase may represent fluid that accumulated since the previous treatment.
However, the number should always be interpreted in context.
Your care team considers your individual treatment plan, remaining kidney function, nutritional status, and other medical factors.
Do not use someone else’s weight gain or fluid target as a goal for yourself.
Why dialysis centers use kilograms
Most dialysis centers record weight in kilograms rather than pounds.
One kilogram is approximately 2.2 pounds.
You may therefore hear staff say numbers such as:
- 70 kilograms
- 72.5 kilograms
- 68.8 kilograms
Using kilograms is standard in dialysis because treatment calculations and medical equipment commonly use the metric system.
You do not need to calculate anything yourself.
The important thing is understanding what your current target weight is and asking questions if something does not make sense.
A simple example
Suppose a patient’s ordered target weight is 70 kilograms, and they arrive for dialysis weighing 72 kilograms.
The approximately 2-kilogram difference tells the dialysis team that there has been a weight increase since the target weight.
That information helps guide the treatment plan.
But it does not automatically mean exactly 2 liters should be removed.
The actual fluid-removal goal still follows the doctor’s prescription and may account for:
- the patient’s clinical condition
- how the patient tolerates treatment
- blood pressure
- treatment time
- fluids given or consumed during the treatment
- other prescribed instructions
This is why dialysis treatment involves more than subtracting two numbers on a scale.
What can vary from patient to patient
Dry weight management is highly individualized.
Two people who weigh exactly the same amount may have completely different:
- target weights
- fluid-removal goals
- treatment times
- blood pressure responses
- urine output
- heart conditions
- medications
- tolerance for fluid removal
That is why comparing your numbers with another person in the dialysis center is usually not useful.
Your treatment is based on your own prescription and clinical condition.
Questions worth asking your dialysis care team
- What is my current ordered target weight?
- Has my target weight changed recently?
- What factors does my doctor use when deciding whether to adjust it?
- How close have I been getting to my target after treatment?
- What symptoms should I report during fluid removal?
- If I gain or lose actual body weight, how should I let the team know?
- How does my remaining urine output affect my fluid management?
- What should I understand about my weight gain between treatments?
You do not need to understand every treatment calculation.
But knowing what the numbers mean can make conversations with your care team much easier.
The main thing to remember
Dry weight is not simply “what you should weigh.”
It is an estimated post-dialysis target included in your treatment plan.
Your pre-treatment weight helps the dialysis team understand how much weight has accumulated since the previous treatment, but fluid removal is carried out according to your doctor’s prescription, your clinical condition, and how your body is tolerating the treatment.
Your target weight may also change over time as your actual body weight, urine output, health, and fluid status change.
If a target weight consistently feels difficult to reach or you develop symptoms during or after treatment, tell your dialysis care team so they can evaluate what is happening.
Related Renal Care Planner Resources
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- How to Manage Fluid Restriction on Dialysis \n\n
- What Happens During Hemodialysis?
- Your First Hemodialysis Treatment: What to Expect
- Why Am I So Tired After Dialysis?
- What to Bring to Dialysis: A Practical Treatment-Day Packing Guide
- Treatment Day Notes & Questions Log
- Why Are You Weighed Before and After Dialysis?
- What Is a UF Goal in Dialysis?
Frequently Asked Questions
Is dry weight the same as my normal weight before kidney failure?
Not necessarily.
Dry weight is a current clinical target used as part of your dialysis treatment plan. Your body weight may have changed since before kidney failure because of illness, nutrition, muscle changes, age, or other factors.
Can my dry weight change over time?
Yes.
Your doctor may reassess your target weight as your actual body weight, urine output, blood pressure, symptoms, nutritional status, or overall medical condition changes.
It should not be thought of as a number that automatically changes with every routine fluctuation on the scale.
Why do staff keep talking about kilograms?
Dialysis centers typically use kilograms because medical equipment and treatment calculations commonly use the metric system.
One kilogram is approximately 2.2 pounds.
Does reaching my dry weight mean all extra fluid is definitely gone?
Not necessarily.
Dry weight is a clinical estimate rather than a directly measurable point where every bit of excess fluid can be proven to be gone.
Your doctor and dialysis team use multiple clinical signs and trends to judge whether the target remains appropriate.
What if I feel worse when trying to reach my target weight?
Tell the staff while you are being treated.
Symptoms such as cramping, dizziness, weakness, nausea, or low blood pressure can occur when your body is having difficulty tolerating fluid removal.
Those symptoms do not automatically prove that the target weight is incorrect, but they are important information for your care team.
Can I decide to change my own target weight?
No.
Target weight is part of the dialysis prescription and should be set or adjusted by your doctor based on your clinical condition.
If you think your target may no longer feel appropriate, discuss what you are experiencing with your dialysis nurse and nephrologist.
Sources
- National Kidney Foundation. What Is Dry Weight?
- National Institute of Diabetes and Digestive and Kidney Diseases. Hemodialysis.
- National Institute of Diabetes and Digestive and Kidney Diseases. Eating & Nutrition for Hemodialysis.
- Canaud B, Chazot C, Koomans J, Collins A. Fluid and hemodynamic management in hemodialysis patients: challenges and opportunities. J Bras Nefrol. 2019;41(4):550–559. PMID: 31661543.
General education only. Renal Care Planner provides general educational information and planning resources and does not replace individualized medical care. Target weight and fluid-removal goals are determined through your dialysis prescription and managed by your dialysis care team. Do not change your fluid intake, treatment settings, or target weight based on information on this page. Discuss symptoms or concerns with your nephrologist or dialysis care team.