Hemodiafiltration · HDF
A superior machine,a deeper clean.
Standard dialysis clears the small wastes. Hemodiafiltration goes further — flushing out the bigger, more harmful molecules that ordinary dialysis leaves behind. In the largest trial ever run, patients on high-dose HDF lived longer.
77%
higher survival with high-dose HDF, compared with standard high-flux dialysis — the CONVINCE trial
NEJM 2023 · 1,360 patients · 8 countries
What actually changes
Two ways to clean blood — one reaches further.
Think of your kidneys’ job as picking waste out of your blood. Both treatments use a filter, but they pull waste out in different ways. The difference is which wastes get removed.
Standard dialysis (HD)
Diffusion only — the wastes drift out
Small waste molecules slowly drift across the filter on their own. It works — but the larger, stickier molecules move too slowly to clear well, so many stay in the blood.
Hemodiafiltration (HDF)
Diffusion + convection — the wastes get flushed
HDF adds a strong current of clean fluid that washes through the filter and drags the bigger molecules out with it. So both small and middle-sized wastes leave the body — much closer to what a real kidney does.
In plain words
Why the bigger wastes matter
01
Not all waste is small
Failing kidneys let many wastes build up. The small ones are easy to remove. But a whole class of middle-sized molecules also accumulates — and standard dialysis struggles to shift them.
02
These are the ones that make you unwell
Those middle molecules are linked to inflammation, stiff and damaged blood vessels, poor appetite and fatigue — the slow, grinding toll that dialysis patients know well.
03
HDF clears them out
By flushing a large volume of clean fluid through the filter every session, HDF removes far more of these harmful middle molecules — leaving the blood genuinely cleaner.
The evidence · the CONVINCE trial
This isn’t a theory. It was measured.
In 2023, a landmark trial — CONVINCE, published in the New England Journal of Medicine and co-authored by Prof. Bernard Canaud — randomly assigned 1,360 dialysis patients across eight European countries to either high-dose HDF or standard high-flux dialysis, then followed them for about two and a half years.
Survival Probability
More people on HDF survived during the trial — a 77% higher probability of survival (a result very unlikely to be down to chance).
The benefit was strongest against infection-related deaths, including COVID-19. A later 2024 analysis in The Lancet, pooling every major trial, reached the same verdict: HDF reduces deaths, and more clean-fluid flushing means more benefit.
What it means for you
The advantages, one by one
Living longer
The headline finding: a 23% lower risk of death from any cause versus standard dialysis, in the largest trial ever conducted.
Fewer infections that turn deadly
The clearest survival gain came from a drop in infection-related deaths — your body copes better when the blood is cleaner and less inflamed.
Steadier sessions
HDF tends to be gentler on blood pressure during treatment, so patients often feel less of the crashing, cramping and washed-out feeling that can follow dialysis.
A sharper mind, a fuller life
In the trial’s quality-of-life results, HDF patients held on to their thinking, physical function and social life better than those on standard dialysis — the decline was slower.
It’s not just more years. It’s better ones.
CONVINCE measured how patients actually felt — every three months — across physical health, pain, mood, sleep and thinking. The HDF group’s quality of life slipped more slowly than the standard-dialysis group’s, with the clearest gap in cognitive function: the ability to think clearly and stay engaged.
For the first time in decades, a change in the basic principles of dialysis has turned out to be genuinely meaningful for patients. Hemodiafiltration can be considered a superior alternative to standard dialysis.
HDF at Apex Kidney Care
Available to you —even at home.
Apex offers hemodiafiltration both in our centres and as part of our home dialysis programme, so patients who would benefit from a deeper clean can have it in the comfort and safety of their own bedroom — supervised by a trained, ACLS-certified team.
Explore Home DialysisApex HDF, at a glance
Talk to your nephrologist about hemodiafiltration.
Not everyone needs HDF, and not every patient is suited to it — but for many on dialysis, it’s the closest thing yet to a deeper, kinder clean.
Ask the Apex team whether it’s right for you.
For quick contact :
74000 95950 | info@apexkidneycare.com
Disclaimer: The information provided is for general awareness only and should not replace professional medical advice. Always consult your nephrologist for guidance specific to your condition.