Why Was I Referred to a Nephrologist? What to Expect

Your doctor has referred you to a nephrologist, a kidney specialist, and you want to know why. Reasons include kidney blood or urine results, blood in the urine, or blood pressure that is hard to control. Letters, lab reports and scan reports can go in a folder or in Sam's Health Vault, your own copy, not linked to an electronic patient record.

This article covers why people are referred, what a nephrologist does, how the first visit works and what to bring. What creatinine, eGFR and albumin mean is explained in kidney test results explained. What Sam keeps for this condition is on the chronic kidney disease page.

Why do doctors refer people to a nephrologist?

Causes of chronic kidney disease (CKD) include high blood pressure and diabetes, according to the NHS. In many cases it is found in a routine blood or urine test done for another reason.

The UK guideline NICE NG203 (2021) lists when to refer adults with CKD for specialist assessment. Doctors weigh your wishes and other conditions too. Any one of these counts:

• A calculated 5-year risk of kidney failure above 5%, estimated by your doctor with a validated risk tool.
• A urine albumin-to-creatinine ratio (ACR) of 70 mg/mmol or more, unless diabetes explains it and it is already treated.
• An ACR above 30 mg/mmol together with blood in the urine.
• A sustained fall in eGFR of 25% or more within 12 months, with a change in eGFR category.
• A sustained fall in eGFR of 15 ml/min/1.73 m2 or more per year.
• Blood pressure above your target despite at least four blood pressure medicines at therapeutic doses.
• A known or suspected rare or genetic cause, or a suspected narrowing of a kidney artery.

The international KDIGO guideline (2024) gives a similar list. It adds an eGFR below 30, an uncertain cause, hereditary kidney disease, recurrent kidney stones and lasting potassium problems.

These criteria are for clinicians. They are not a test you can run on your own report, and not meeting one is no all-clear.

What does a nephrologist do?

Doctors in renal medicine, also called nephrologists, diagnose and treat diseases of the kidneys, says the NHS careers service. That includes inherited conditions such as polycystic kidney disease, autoimmune disorders and kidney tumours. Nephrologists also treat people with kidney failure through dialysis or a transplant.

KDIGO describes the scope as broad. It covers acute and chronic kidney disease and kidney involvement in whole-body diseases. It also covers blood pressure that resists treatment and imbalances in blood chemistry. One goal of a referral is to look for a specific diagnosis where that is appropriate.

What happens at the first appointment?

KDIGO lists the building blocks for finding the cause. They include your own and your family's history, social and environmental factors and your medicines. Then come a physical exam, lab tests and imaging. In some cases genetic testing or a kidney biopsy follows.

The National Kidney Federation, a UK patient charity, describes the visit itself like this:

1. A physical examination, which may include your blood pressure and a check for fluid retention.
2. Blood and urine tests to look at kidney function.
3. A talk about treatment options once the results are back.

The NHS adds that an ultrasound, MRI or CT scan shows the kidneys and any blockage. A biopsy takes a small sample of kidney tissue to look at under a microscope. KDIGO suggests a biopsy when it can clarify the cause and guide treatment. Your nephrologist decides whether you need one.

You may not get every answer on the day. Some results come later.

How to prepare for your first nephrology visit

Clinics vary, so ask what yours needs before the day. A typical list:

• Your referral details and appointment letter.
• Earlier blood and urine results, including ones from other clinics or a hospital. KDIGO only calls kidney disease chronic after at least three months and lists past results as evidence.
• Doctor's letters, discharge summaries and scan reports. How to ask for copies is covered in getting a copy of your medical records.
• A full list of your medicines, including over-the-counter and herbal products and supplements. The National Kidney Federation calls the medication list one of the most useful things to bring. See what to put on a medication list.
• A urine sample. The National Kidney Federation suggests one in a clean container from your hospital, pharmacy or GP surgery.
• Home blood pressure readings, if you take them. High blood pressure can cause kidney disease. It can also be a result of it, notes the German GP guideline.
• What you know about kidney disease in your family, such as polycystic kidneys or relatives on dialysis.
• Your questions, the most important first.

Questions worth asking: What is the likely cause? Which tests come next? Who will do my check-ups from now on? Who do I contact if I get worse? Can I have a copy of the clinic letter? For a general list, see the doctor appointment checklist for a chronic condition.

How do you keep letters and results to hand?

In Sam, letters, discharge summaries, imaging reports and lab reports go into the Health Vault. You add them by camera scan, photo or PDF. At the visit you open the pages full screen in the app. You can pass the original file on through the iOS share sheet, for example to print it.

Once you consent, Sam takes values such as creatinine and eGFR from lab reports. It recognizes about 33 lab values by name, and urine albumin is not one of them. Some rows are filed under the wrong name: urine creatinine, for example, can be saved as blood creatinine. When a report prints separate ranges for women and men, Sam keeps only the first. So always check the original report.

Your medicines go in the medication list. The catalog is a selection, not a recommendation, so check the strength on your pack. Sam does not check interactions.

Outside the blood pressure diary, Sam shows blood pressure only when your cuff saves readings to Apple Health. You also need to switch on the Blood Pressure & Glucose group in your health metrics. Sam does not measure blood pressure and has no blood pressure log for kidney disease. If a doctor has also confirmed high blood pressure, Sam has a blood pressure diary. There you enter readings yourself and can create a doctor report on your blood pressure as a PDF. Sam has no doctor report for the kidneys.

Nephrologist or urologist: who does what?

Both work with the kidneys, but in different ways. Nephrologists are physicians and do not operate. Urologists are urological surgeons, says the NHS careers service. They treat problems of the female urinary system and the male genitourinary tract. Kidney stones, urinary retention and kidney infections are common in their work, and they use lasers and robotic surgery.

The German GP guideline, which adapts NICE here, draws one clear line: signs of a blocked urine outflow, such as a widened renal pelvis on ultrasound, should lead to a referral to urology. Your GP or primary care doctor helps decide which specialist fits.

Do you need a referral, and how long is the wait?

On the NHS, you generally cannot refer yourself to a hospital specialist. The specialist sees you with a letter from your GP, which gives your history and what to look at. In England, the NHS Constitution covers non-urgent referrals. You have the right to start consultant-led treatment within 18 weeks. The exceptions are when you choose to wait longer or a longer wait is clinically right.

In the US, it depends on your plan. HealthCare.gov notes that many HMOs require a referral from your primary care doctor. Without one, the plan may not pay. Check with your plan before you book. This is general information, not legal advice. Rights and plan rules differ by country, plan and over time.

While you wait, go back to your doctor sooner if symptoms get worse or new ones appear. For the signs in the next section, do not wait at all.

What if you feel worse before the visit?

Early CKD usually causes no symptoms, according to the NHS. Some signs still need help sooner than a planned visit:

• For sudden or severe trouble breathing, chest pain or confusion, call your local emergency number (112 in the EU, 999 in the UK, 911 in the US).
• For clearly less urine than usual, new swelling, trouble breathing when you lie down, rapid weight changes, ongoing vomiting or diarrhea, or visible blood in your urine (pink, red or dark brown), ask for an urgent appointment with your doctor today. Out of hours, use your local urgent care line, such as NHS 111 in the UK.
• For any other new or worsening symptom, contact your doctor rather than waiting for the clinic date.

Do not wait for it to pass. You can log symptoms such as leg swelling or blood in urine in the symptom diary. There is one entry per symptom per day. Sam does not interpret the entry medically, and it does not replace a call to your doctor.

What happens after the first visit?

The German GP guideline separates a one-off visit, for example at first diagnosis or when something changes, from ongoing shared care with the kidney clinic. Whether you keep seeing the nephrologist is decided case by case. Reasons include the type and severity of the disease, complications, special treatments and your wishes. The guideline also provides for settling which tasks your GP practice takes on and which the kidney clinic does.

Ask at the end of the visit who does your next check-up and when. Ask for a copy of the clinic letter too, and add it to your other reports in Sam.

Keep letters and reports ready in Sam for the kidney clinic

You arrive at the kidney clinic with your letters, results and medicines in one app, not in folders.

• Instead of a folder: the Health Vault keeps doctor's letters, discharge summaries, scan reports and lab reports. You add them by camera scan, photo or PDF and open the pages full screen at the visit.
• Instead of comparing two printouts: once you consent, Sam takes values such as creatinine and eGFR from lab reports. It shows up to three values that changed most between your last two lab reports.
• Instead of a paper list: the medication list holds long regimens and reminds you at the set intake times when you switch the reminder on.

Sam measures neither kidney function nor blood pressure and does not know urine albumin as a value of its own. More on the chronic kidney disease page.

Try Sam for free

Sam is a wellness companion, not a medical device. The app does not diagnose, treat, cure or prevent any disease or health condition. Always consult qualified professionals for medical decisions.

Related reading

• Low eGFR: what to do after a high creatinine result
• Kidney test results explained: creatinine, eGFR, albumin
• Medication list for your doctor: what to include
• Doctor appointment checklist for a chronic condition
• Getting a copy of your medical records when changing doctor
• Managing multiple conditions: appointments and records

Sources

Updated: October 2026

• NICE: Chronic kidney disease: assessment and management (NG203) (published 25 August 2021, last updated 24 November 2021; recommendation 1.5.5)
• KDIGO: KDIGO 2024 Clinical Practice Guideline for the Evaluation and Management of Chronic Kidney Disease, Kidney International 2024;105(4S):S117-S314 (Practice Points 1.1.3.1 and 1.1.4.1, Recommendation 1.1.4.1, Practice Point 5.1.1 with Figure 48 and its rationale)
• NHS: Chronic kidney disease and diagnosis (last reviewed 22 March 2023), Acute kidney injury (last reviewed 11 March 2026), Blood in urine (last reviewed 25 September 2026), Referrals for specialist care (last reviewed 12 April 2023)
• NHS Health Careers: Renal medicine and Urology (no date shown)
• National Kidney Federation (UK): Preparing for your first visit to a nephrologist (published 1 October 2024, updated 25 February 2025)
• HealthCare.gov: Referral (glossary)
• DEGAM/DGfN: S3 guideline on chronic kidney disease not requiring dialysis in primary care, long version (AWMF 053-048, version 2.0, 2024; section 6.2.1 on blood pressure, section 6.3 and recommendations 6.13 and 6.14 on shared care and urology; German)