If you or someone you love is in the months leading up to dialysis, the home tracking you do right now matters more than at any other point in kidney disease. A clear personal baseline — weights, blood pressures, urine output, symptoms, fluid intake — gives your nephrology team the information they need to guide the transition well and gives you a reference point for understanding what's happening to your body. This post covers what the pre-dialysis window actually is, what to track, how to work with your care team, and why consistency matters more than perfection.
A note first: this is a hard time, and reading a blog post about it may or may not be what you need right now. If you're feeling overwhelmed, close this tab and come back later. Nothing here requires urgency. When you're ready, the information will still be here.
The pre-dialysis window (what it is and what to do)
The pre-dialysis window is the clinical term for the period between late-stage CKD and actually starting dialysis. For most people, this is roughly the stretch when eGFR has dropped below 20 but you haven't yet begun kidney replacement therapy. It can last anywhere from a few months to a few years depending on how rapidly your disease is progressing.
According to the National Kidney Foundation, this window is when several important decisions get made. You and your care team are evaluating dialysis options (hemodialysis at a center, home hemodialysis, or peritoneal dialysis), considering transplant evaluation if you're a candidate, and preparing your body for the transition. Vascular access (a fistula for hemodialysis or a catheter for peritoneal dialysis) often gets placed during this window, weeks to months before it's actually needed, so it has time to mature.
During this window, your daily experience is probably changing. Symptoms that were manageable earlier may be getting harder — fatigue, swelling, decreased appetite, trouble concentrating, sleep disruption. This isn't your imagination and it isn't your fault. It's the reality of what happens as kidney function drops below about 15 percent of normal.
What to do with the window is less about aggressive intervention and more about preparation. Build a personal baseline. Learn what your body's rhythms look like so you can tell the difference between normal day-to-day variation and genuine changes. Develop relationships with your care team. Get clear on what your options are so the choices ahead feel informed rather than rushed.
Key metrics to establish as your baseline
Five things are worth tracking consistently during the pre-dialysis window. None of them take long. The value is in the cumulative record across weeks and months.
Daily morning weight, taken at the same time, after urinating, before eating. At this stage, weight changes reflect fluid status more than food. A creeping upward trend over days often signals fluid retention before swelling becomes visible, which gives you and your doctor a chance to respond sooner.
Blood pressure, twice daily if you have a home cuff — once in the morning, once in the evening. Pre-dialysis blood pressure can be unstable, and patterns across the day matter. A notebook or a home monitor with memory both work.
Urine output, at least a rough estimate. Some patients measure directly; others just note whether urination feels normal, reduced, or much reduced compared to their baseline. Decreased urine output is one of the signals that the window is closing and dialysis start is approaching.
Symptoms, one-line daily note. Fatigue level, sleep quality, appetite, swelling anywhere, concentration, mood. You don't need to score these precisely. What matters is that you notice changes week over week.
Fluid intake, approximate ounces. If your nephrologist has given you a specific fluid restriction, tracking intake becomes essential. Even without a formal restriction, knowing your daily intake helps interpret weight and symptom changes.
Apps like Urivia let you log urine color, hydration, and symptoms across time, which makes it easier to see patterns across weeks than trying to remember from memory. A paper journal or spreadsheet works equally well. The tool matters less than the consistency.
Working with your care team on tracking
The data you collect at home is most useful when it connects to what your care team sees in labs and appointments. This requires two-way communication that doesn't always happen automatically.
Bring your tracking log to every appointment. Not memorized — actually written down or in an app you can show. A nephrologist looking at a 30-day weight trend alongside lab results can often see patterns that neither alone would reveal.
Ask your team which specific metrics they most want you to track. Different nephrologists prioritize different signals. Some care most about weight. Others care most about blood pressure. Most care about symptoms. Direct guidance on what to prioritize prevents you from wasting effort on things that don't inform clinical decisions.
Establish clear rules for when to call. "Call if your weight jumps more than X pounds over Y days." "Call if blood pressure hits this number twice in a row." "Call if urination drops noticeably." Having explicit thresholds prevents the twin failure modes of calling for every small change and of waiting too long when something real is happening.
Know who to call after hours. Pre-dialysis patients sometimes need urgent guidance on nights and weekends. Your nephrology practice should have an on-call system. Know the number and know when it's appropriate to use.
The post on reading your kidney labs covers how home tracking data connects to the lab numbers your team is monitoring, which helps these conversations feel grounded in shared evidence.
Keeping personal records
The records you keep during the pre-dialysis window serve you for years beyond it. Patients who start dialysis with a clear personal baseline often navigate the transition more smoothly and advocate for themselves more effectively in appointments.
A good record-keeping setup for this stage includes:
A running document or app where daily tracking data goes. Dates, weights, blood pressures, symptoms, fluid intake, any notable events. Nothing fancy.
A lab record organized by date. Your eGFR, creatinine, BUN, potassium, phosphorus, hemoglobin, and albumin over time. Patient portals usually let you export these. Having them in one place makes trends obvious in a way that scrolling through individual reports doesn't.
A list of your medications, current and recent. Include dosages and when changes happened. This is useful for every appointment and essential in emergencies.
A list of your care team with contact information. Nephrologist, primary care, dialysis center (once assigned), vascular access surgeon if you've had an access placed, renal dietitian. When something happens, you shouldn't have to search for a phone number.
Questions that come up between appointments, written down as they occur. You'll forget them otherwise. A running list makes appointment time more productive.
The post on questions for your nephrologist has a starting framework for what to bring to appointments.
Why consistency matters more than perfection
Most patients starting home tracking imagine they'll track perfectly every day. Most patients, realistically, track four or five days a week for a while, then slip to three, then sometimes fewer. This is normal and it's fine.
What matters is whether you have enough data to see patterns, not whether every cell in your tracking log is filled in. A weight recorded four days a week across a month tells the same trend story as seven days a week. A blood pressure log with weekends missing still reveals the overall pattern.
Don't quit because you missed a day. Don't apologize to your doctor for gaps. Just pick back up the next day and keep going.
The exception is when your care team has asked you to track something specific daily because they're using it to make clinical decisions. In that case, the consistency matters more. Ask directly which pieces of tracking are being used that way.
Perfectionism is a common quiet reason people stop tracking altogether. The moment tracking starts to feel like a burden that you're failing at, you're likely to drop it entirely. A sustainable imperfect record beats an aspirational perfect one.
When to see a doctor
This window involves frequent medical contact, but some changes warrant urgent calls rather than waiting for the next appointment:
Call your nephrologist or on-call team promptly for: sudden weight gain of more than 3 pounds over one to two days; new or rapidly worsening swelling; significant drop in urination; shortness of breath that's new or worse; blood pressure readings well above or below your typical range; confusion or severe fatigue beyond your baseline.
Go to urgent care or the ER for: severe shortness of breath, especially when lying flat; chest pain; confusion that comes on suddenly; inability to urinate for an extended period; severe swelling that appeared rapidly; any signs of infection alongside your other symptoms.
A blog post can't examine you. These guidelines are a starting point, not a replacement for clinical judgment. When in doubt, call.
How to track this yourself
Apps like Urivia let you log urine color, hydration, weight, and symptoms across time, which is particularly useful during the pre-dialysis window when pattern recognition matters most. A paper journal or spreadsheet works equally well if that's what you'll actually use consistently.
The CKD stages post covers what stage 4 and 5 CKD looks like clinically, which helps contextualize the tracking you're doing.
What you're building is a reference point. The data from these months will inform conversations with your care team for years, including after dialysis starts when some baseline comparisons become clinically useful.
Frequently asked questions
How far in advance does dialysis prep usually start?
Clinical preparation often begins when eGFR drops below 20, which for most patients is months to a few years before actual dialysis start. Vascular access (fistula) placement typically happens 3 to 6 months before anticipated dialysis, so the fistula has time to mature. Education about dialysis options and transplant evaluation often start even earlier.
What's the difference between home tracking and what my dialysis center does?
Dialysis centers track the specifics of each treatment session and the lab values relevant to dialysis care. Home tracking captures the day-to-day patterns between sessions, which the center only sees in snapshots. Both sets of data are valuable, and they answer different questions. Your home record helps your team understand what's happening in your life between appointments.
Can I prepare for dialysis while still hoping for a transplant?
Yes, and most care teams encourage both tracks. Transplant evaluation and dialysis prep happen in parallel for most candidates, because even patients who will eventually receive a transplant often need dialysis as a bridge. Having both options developed reduces the pressure of late-stage decisions.
What should I do if my weight jumps overnight?
A single day's jump of a pound or two is usually normal variation (meal timing, constipation, sodium intake the day before). A jump of 3 pounds or more in one to two days, especially if it persists, warrants a call to your nephrology team. Fluid retention is common in pre-dialysis and often responds to medication adjustment or dietary changes.
Is it normal to feel exhausted during pre-dialysis prep?
Yes. Fatigue is one of the most common symptoms of late-stage CKD and affects almost everyone in the pre-dialysis window. Anemia (low red blood cells, which damaged kidneys contribute to) is a frequent cause and is often treatable. Mention fatigue specifically at appointments — it's easy to skip over as "just how I feel" when it actually has addressable causes.
Should I tell family members what I'm tracking?
Helpful, in most cases. A family member who knows what your baseline weight is, what your normal symptoms look like, and what warning signs matter is better positioned to help if something urgent happens. This is especially important if you live alone or travel. You don't need to hand over your full log — a summary of what matters and what the warning signs are is usually enough.
How does peritoneal dialysis preparation differ from hemodialysis prep?
The tracking priorities are similar across both modalities. The main differences are around access: hemodialysis requires a fistula (usually in your arm), which has its own set of checks and precautions. Peritoneal dialysis requires an abdominal catheter with specific care requirements. Your care team will give you modality-specific guidance layered on top of general pre-dialysis tracking.