Most patients reach a nephrology clinic later than they should have. Not because anyone was careless. Chronic kidney disease produces no symptoms until it is advanced, and the two tests that catch it early are easy to order and easy to forget.
By the time swelling, fatigue, or foamy urine push someone toward a specialist, a large share of kidney function is usually gone and is not coming back. Referred at the right point, the same person often has years of preserved function still ahead.
If you have just been handed a referral and the word dialysis is stuck in your head: most people I see for a first visit never need it. A referral usually means someone caught something early, which is exactly when this specialty does the most good.
Here are the thresholds that matter, what the first visit looks like, and what to ask while you are in the room.
The two numbers
Kidney function is staged on two measurements, and you need both. Either one alone will mislead you.
eGFR, the estimated glomerular filtration rate, is calculated from a blood creatinine level along with age and sex. It estimates how much blood the kidneys filter each minute. Above 90 is normal. 60 to 89 is mildly reduced. 45 to 59 and 30 to 44 are the moderate bands. 15 to 29 is severe. Below 15 is kidney failure.
uACR, the urine albumin-to-creatinine ratio, measures protein leaking into the urine. Under 30 mg/g is normal. 30 to 300 is moderately increased. Above 300 is severely increased.
Why both matter: protein in the urine often shows up years before eGFR starts to fall. Someone with an eGFR of 85 and a uACR of 400 has kidney disease and a real risk of it getting worse, and an eGFR-only workup will tell them they are fine. The reverse mistake happens too. One low eGFR on a morning you were dehydrated is not chronic kidney disease. The abnormality has to last at least three months.
That is why nephrologists talk about a grid rather than a single number.
When to see a nephrologist
These are the points where guidelines say a specialist should be involved:
- eGFR persistently below 30. The clearest threshold there is, and the point where planning for future treatment options has to start, well before anything is needed.
- uACR persistently above 300 mg/g , or any protein in the urine along with unexplained blood.
- A sustained drop in eGFR of 25 percent or more from your baseline, or a steady downward slope over months, wherever the number sits.
- Blood pressure above goal on three medications , one of them a diuretic.
- Recurrent kidney stones , or a first stone in a young person or someone with a strong family history.
- Sodium, potassium, calcium, or bicarbonate that keep drifting out of range.
- Acute kidney injury that has not returned to baseline , or a second episode.
- A known genetic kidney condition , or a parent, sibling, or child on dialysis or living with a transplant.
Plenty of people reasonably see a nephrologist earlier than this, with an eGFR under 60 or any protein in the urine, especially with diabetes or a family history. Earlier is never the wrong time.
Notice what is missing from the list: a single abnormal creatinine, and symptoms. Waiting for symptoms is exactly how patients arrive late.
Nephrologist or primary care: who manages your kidney disease?
Usually both, with clear roles.
Your primary care doctor stays at the center: blood pressure and diabetes between visits, screening, vaccines, everything that is not the kidney. The nephrologist sets the kidney plan, confirms the cause, chooses and doses the drugs that protect the kidneys, manages complications like anemia, acid buildup, and potassium, and plans ahead if kidney failure becomes likely.
Mild, stable disease can often go back to primary care with a written plan and a yearly check-in. Fast decline, heavy protein in the urine, or an eGFR below 30 belong with a nephrologist for the long haul. Earlier referral is linked with better outcomes, including fewer people starting dialysis in an emergency.
The handoffs work best when both doctors read the same chart.
Your first nephrologist appointment: what to expect
Not a prescription. A cause and a slope.
The visit has three questions to answer. Why are the kidneys injured: diabetes, hypertension, an immune process, a blockage, a medication, something inherited? How fast is it moving, judged from your prior labs rather than today's single value? And what can be changed: blood pressure, blood sugar, protein in the urine, over-the-counter anti-inflammatories, contrast exposure, or a drug whose dose needs adjusting for your kidney function?
To get there, expect a detailed history, a medication review more thorough than you are used to, a blood pressure check and a look for leg swelling, a urinalysis with microscopy, a quantified albumin measurement, and in most cases a kidney ultrasound. Occasionally a biopsy is the only way to answer the why, and that decision belongs at this visit, not three appointments later.
You should leave with a stage, a likely cause, and a plan with a follow-up interval attached. If you are missing any of the three, ask before you go.
What to bring
- Every creatinine and eGFR result you can find , going back as far as possible. One value tells me where you are. Several tell me where you are heading.
- Any urine tests and imaging reports.
- Every pill bottle , including over-the-counter pain relievers, acid reducers, vitamins, and supplements. Ibuprofen and naproxen are the most common things I stop at a first visit. Some herbal supplements are a close second.
- A week of home blood pressure readings , if you have a cuff.
- The names of your other doctors , and any family history of dialysis, transplant, or kidney cysts.
The day before, drink normally and skip a hard workout, since both dehydration and heavy exercise can bump creatinine. If you take creatine for training, say so; it raises creatinine on a blood test without any real change in the kidney, as our post on creatine and your kidneys explains.
And if you have diabetes, high blood pressure, or a family history of kidney disease and have never had a urine albumin test, ask for one before you come in. It is the single most useful test to bring.
Questions to ask your nephrologist
Pick the ones that fit:
- Do I have chronic kidney disease, and what stage?
- What is causing it?
- Is my kidney function stable or changing, and how fast?
- Which of my medications should I stop, change, or start?
- Am I on every drug that protects the kidneys, such as an ACE inhibitor or ARB and an SGLT2 inhibitor? If not, why not?
- What should my blood pressure goal be?
- Which pain relievers are safe for me? Our guide to kidney-safe pain relievers is a good start.
- How often should my kidneys be checked, and what should make me call before then?
Write the answers down, or bring someone to take notes. Most people remember less than half of what they hear at a specialist visit.
After the first visit
How often you come back depends on your stage and how fast things are moving. Stable early disease might mean one or two visits a year. Advanced or changing disease can mean every one to three months, and many lab reviews and medication adjustments can be done by video.
If kidney disease reaches stage 4, Medicare Part B covers up to six sessions of kidney disease education on diet, medications, and the options if kidney failure comes. Few people use them. Ask.
Nephrologist or urologist
Patients get routed to the wrong one regularly. A nephrologist is an internal medicine physician with fellowship training in how the kidneys work: filtration, blood pressure, electrolytes, acid-base balance, dialysis, and transplant medicine. A urologist is a surgeon who operates on the urinary tract. Our explainer on what a nephrologist is compares the two side by side.
Kidney stones cause most of the confusion. A stone that is stuck and needs to come out is a urology problem. Working out why you keep forming stones, and stopping the next one, is a nephrology problem. Patients with recurrent stones often need both, and the metabolic workup is the half that usually gets skipped.
Three things specific to kidney patients in this city
Heat. Repeatedly working or training to the point of dehydration in extreme heat causes measurable kidney injury, and the build-up of those episodes is now an established path to chronic kidney disease in outdoor workers worldwide. In a city with a long, punishing summer and a very large outdoor workforce, that is not a theoretical risk. If you work outside and have any risk factor at all, your kidney function belongs on a schedule.
Storms. Dialysis is the medical service most exposed to flooding and power loss, and this region has tested that repeatedly. Anyone on dialysis, or getting close, should have a plan on file before hurricane season: a backup unit outside their usual flood corridor, a current copy of the dialysis prescription, the emergency diet, and the regional kidney emergency line. Arrange it in February, not in August.
The Medical Center. Houston's concentration of transplant programs is a real advantage, but evaluation has its own timeline, and eligibility can be established long before dialysis begins. A transplant done before dialysis starts generally turns out better than one done after. That timing decision is made in a nephrology clinic, not at the transplant center.
Checking a nephrologist's credentials
Nephrology is a subspecialty of internal medicine, certified through the American Board of Internal Medicine. You can confirm any physician's board certification free through the American Board of Medical Specialties. The Texas Medical Board publishes license status, training, and any disciplinary record for every physician licensed in the state, and the federal NPI registry confirms specialty and practice location.
All three take about two minutes combined. For a specialty this consequential, spend them.