Tutorial: Explaining a CKD Trend to a Patient

This tutorial walks you through drafting a letter that explains a patient's CKD trajectory in plain language. The scenario: a 67-year-old man has been attending your clinic for two years. His eGFR has declined gradually from 48 to 38 over that period. He is at Stage 3b. He comes to every appointment with his printed blood results and asks the same question: "Am I getting worse?"

The answer is nuanced — yes, there has been a gradual decline, but no, he is not in crisis, and there is a meaningful difference between a slow progressive decline and a rapidly deteriorating trajectory. You have explained this verbally at every visit. He absorbs it in the consultation but cannot always recall or convey it to his family. He has asked for something in writing.

Step 1: Open the tool and set the task

Open claude.ai or chat.openai.com. Start a fresh conversation. Type:

You are helping a nephrologist draft a patient letter about CKD 
(chronic kidney disease) progression. I will describe the 
patient's clinical situation and the key messages I want to 
convey. Draft a clear, calm letter in plain English.

Rules:
- Do not include specific lab values
- Do not include dietary specifics
- Do not include drug names or doses
- Do not be alarming — but do not minimise a genuine clinical issue
- Maximum 350 words

Step 2: Describe the clinical situation and key messages

Patient: man in his late sixties, CKD Stage 3b, cause — 
hypertension and age-related decline.

Trend: gradual decline in eGFR over 2 years — from the upper 
end of Stage 3b to the lower end. Rate of decline: slow and 
consistent, not rapid.

He asks at every appointment whether he is "getting worse." 
The honest answer is: there has been a gradual decline, but 
the pace is slow, it is being monitored, and slow decline is 
very different from a rapidly deteriorating situation.

Key messages I want to convey:
1. What eGFR measures, briefly
2. His kidneys are working less efficiently than they should, 
   and this has changed slightly over the past two years
3. The change has been slow and gradual — this matters 
   clinically
4. What he can do to support his kidney health: 
   blood pressure management, staying well hydrated, 
   avoiding anti-inflammatory painkillers (NSAIDs)
5. That monitoring continues and he will be seen again in 6 months
6. He should contact the team if he notices a change in his health

Step 3: Read the first draft

The tool will produce a letter. Here is an example of what it might return:

Dear [Name],

Thank you for attending your recent clinic appointment. I am writing to explain the results of your kidney function tests in more detail, as I know you find it helpful to have something in writing.

What the Tests Measure

Your kidney function test measures your eGFR — estimated glomerular filtration rate. This is a way of expressing how well your kidneys are doing their job, roughly as a percentage of what fully healthy kidneys would do. A figure in the mid-forties, where yours are, means your kidneys are working at roughly half capacity. That is lower than ideal, but it is a level at which many people live well, with careful monitoring.*

What Has Changed

Over the past two years, your eGFR has declined gradually. You have moved from the higher end of Stage 3b to the lower end. Your question at each appointment — "am I getting worse?" — deserves an honest answer. There has been a small change. But the pace of that change has been slow and consistent.

This matters. A slow, gradual decline in kidney function is a very different clinical situation from a rapid one. It means we are watching something that is changing over years, not something that is deteriorating quickly. The goal of monitoring — and of the steps you take to manage your blood pressure and general health — is to keep the rate of change as slow as possible.

What You Can Do

The most important things are blood pressure management, staying well hydrated (particularly during illness or hot weather), and avoiding anti-inflammatory painkillers — such as ibuprofen — which can put additional strain on kidneys.

What Happens Next

I will see you again in six months. If anything changes between appointments — new symptoms, a significant change in how you feel, or if you are unwell — please contact the clinic rather than waiting for the scheduled appointment.

Yours sincerely, [Your name and contact details]

Step 4: Review the draft

Read the letter as a clinician. In this example:

• The eGFR explanation as "roughly a percentage of what fully healthy kidneys would do" is a reasonable lay framing
• The acknowledgement that his question deserves an honest answer is good — it mirrors how you actually communicate
• The "what has changed" section is honest without being alarming

One sentence to check: "your kidneys are working at roughly half capacity." This framing is commonly used in lay explanation but some patients find it alarming. If you prefer a different framing, ask for a revision:

The phrase "roughly half capacity" might alarm this patient. 
Rewrite that sentence to describe Stage 3b in terms that are 
honest but slightly less stark. Keep the same level of honesty 
about the function being reduced.

Read the revision. If it captures the right clinical and emotional register, keep it. If not, write that sentence yourself.

Step 5: Add the NSAID warning more specifically

The draft mentions "anti-inflammatory painkillers — such as ibuprofen." This is good. But you want to be slightly more specific because this patient occasionally takes ibuprofen for back pain. Ask:

Add a sentence in the "what you can do" section specifically 
noting that ibuprofen and similar anti-inflammatory painkillers 
should be avoided, and that the patient should speak to their 
GP or pharmacist if they need pain relief, as there are 
alternatives that are safer for kidneys.

The tool will add this sentence. Review it to ensure it is accurate and appropriately directive without specifying what the alternative should be — that is a clinical decision for the prescriber.

Step 6: Copy and personalise

Copy the reviewed draft into your letter template. Add:

• The patient's name and address
• Specific eGFR values if your practice includes them in letters (or refer back to the enclosed blood results copy)
• Your name, title, and contact details
• The date
• The next appointment date

Step 7: Read the complete letter one final time

Read it aloud — or at least slowly. This patient is in his late sixties, attends every appointment, and cares about understanding his condition. He will read this letter more than once and share it with his family. Every sentence should be clear and honest. No sentence should either falsely reassure or unnecessarily alarm.

What the tool does badly

The tool does not know the relationship this patient has had with his care over two years. That context — the fact that he asks the same question every time, that he is engaged and attentive, that he finds it helpful to have things in writing — came from you and shaped the draft. Without that context, the tool produces a more generic letter.

It also cannot calibrate the emotional register for a specific patient. Whether "roughly half capacity" is appropriate for this patient is a clinical communication judgement. The tool makes a reasonable general choice. You know whether it is right for him.

What to try next

Apply the same approach to a letter explaining a more rapid decline — for a patient at Stage 4 whose trajectory warrants a more direct discussion of what comes next. The method is the same, but the clinical messages are different, and the emotional calibration requires more care.

Remember: AI is a helpful assistant, not a clinician. You make the call.