Roofer Told He May Have Kidney Disease After Months On A High Protein Diet — Free SCA Practice Case
Roofer told he may have kidney disease after months on a high protein diet
Station Timer
Golden Minute
Initial Introduction
•Introduce yourself
•Ask an open question — "How can I help you today?"
•Listen — don't interrupt
•Catch early cues
Data Gathering
History, ICE & Diagnosis
Clinical Management
Diagnosis, Plan & Decisions
Safety Net
Follow-up & Close
Five cases are free: a live 12-minute consultation with an AI patient each, marked, and no card.
Materials for Candidate
Please review before starting the consultation
Full Name
Lloyd Rutter
Age
54 years
Consultation Type
TelephoneAge
54
Situation
Telephone Consultation. Follow up of blood results.
Reason for Encounter
"The receptionist said my kidney blood test was off and booked me a call. I want to know what is going on."
Medical Records
- ●PMH: Hypertension for 3 years.
- ●Medications: Amlodipine 5 mg once daily.
- ●Allergies: NKDA.
- ●Social: Roofer. Married. Non smoker.
Recent Notes
- ●Blood pressure review, 5 days ago: BP 136/82. Bloods taken. Creatinine 140 micromol/L, eGFR 52 ml/min/1.73 m2.
- ●Previous bloods, 2 years ago: Creatinine 100 micromol/L, eGFR 78 ml/min/1.73 m2.
Patient Script
For the friend playing the patient role
Character Overview: You are Lloyd Rutter, a 54 year old roofer who works for a building firm. You live with your wife Gaynor, who works in a school kitchen, and your grown up son Tyler comes round most weekends. You have had high blood pressure for three years and take one tablet for it. At your blood pressure review last week you had blood tests, and yesterday afternoon the receptionist rang to say your kidney result was "off" and booked this call. Your dad, Ray, was told he had diabetes when you were sixteen, never got on top of it, and needed dialysis in his sixties. He always said he felt fine until a doctor read him a number, and you feel fine now. Last night you read online that protein shakes "wreck your kidneys" and lay awake thinking you had done this to yourself. Roofing is all you have done for twenty five years. You are plain speaking, and under the bluntness you are frightened. Your voice goes quiet and flat when you mention your dad or the shakes. You are impatient with waiting and want something done today.
Opening Sentence: "The receptionist said my kidney test was off. It's the same thing that happened to my dad, I'm sure of it. I want a scan and to see a specialist today, please."
History if Asked (Data Gathering Phase)
- ●The result: "She rang yesterday and just said it was off and a doctor needed to ring me. Nobody's told me the numbers."
- ●How you feel: "Honestly, fine. Fitter than I've been in years. No tiredness beyond normal, no itching, no metallic taste, no feeling sick. Not breathless, and my ankles and face aren't puffy."
- ●Passing urine: "Normal. Up once in the night at most. No burning, no blood, no foam, no colour change, and the stream's fine. Plenty during the day when I'm at home. No loin pain."
- ●Recent illness: "None. No vomiting, no runny tummy, no flu or chest infection, no fevers lately. No operations or hospital stays."
- ●The diet: "I started it four months ago. I'd put on weight and my belt wouldn't do up. It's a high protein plan from a gym channel online. Two whey shakes a day, one after breakfast and one in the evening, and meat with every meal: chicken, beef, bacon and eggs. Hardly any bread, rice or fruit. I've lost two stone and I'm made up about it."
- ●The day of the test: "I had a big steak the evening before, then a bacon sandwich on the way to the review. Nobody told me not to. I'd had a shake as usual that morning too."
- ●Fluids: "Honestly not much. Tea at breakfast, a mug on site, a bottle of squash usually still half full by the end of the day. I sweat a lot up there and there's nowhere to go to the toilet on a roof, so I don't drink until I'm home."
- ●Other supplements: "Only the whey. No creatine, no pre workout, no fat burners, no herbal stuff."
- ●Painkillers (if asked): "Nothing for pain, bar a paracetamol now and then if my back aches after a long day. No ibuprofen or anti inflammatories, no gels or patches, and no steroids or antibiotics lately."
Ideas, Concerns, Expectations
Gating note: Lloyd does not raise any of the following unprompted. Each part comes out only when the doctor asks what he thinks is going on, what is worrying him, or what he was hoping for.
- ●Ideas: He thinks what happened to his dad has started in him, and that he has made it worse himself. "I looked it up last night and it said shakes wreck your kidneys. Two a day for four months. Dad was told to look after his sugar and didn't. I swore I'd never be like him, and then I do this with a tub of powder."
- ●Concerns: He fears he has done lasting damage that cannot be put right, and that it will end his work. "Dad said he was fine right up until they gave him the number. I feel fine. That's what frightens me." He cannot picture doing anything but roofing. "It's all I know. If my kidneys are shot, I'm off the roofs."
- ●Expectations: He wants a scan today to see whether there is damage, and a specialist to tell him straight. "If there's something wrong I want it found now, not weeks down the line." He also asks whether to bin the shakes and whether he can carry on working.
If Asked: Medical History and Medications
Gating note: Lloyd answers each of these plainly when the doctor asks about it.
- ●Blood pressure: "Fine on the amlodipine. One every morning, nothing changed. They said my blood pressure was good at the review."
- ●Other conditions: "Nothing else. No diabetes; my sugar was normal last year. No heart trouble, gout, kidney stones, prostate problems or water infections. As far as I know nobody ever told me I'd got protein in my urine."
- ●Family history: "My dad, Ray, was told he had diabetes in his forties, when I was about sixteen. He never took it seriously, with tablets in a drawer and appointments missed. By his sixties his kidneys had failed and he needed dialysis for the last few years of his life. My mum's fine. I've got a sister and she's fine, as far as I know. There's no one else with kidney trouble."
- ●Dad's last years (if asked what it was like): "Hospital transport at the crack of dawn. A lump in his forearm he had to guard. Mum counting every cup he drank."
- ●Tablets and allergies: "Only the amlodipine. I'm not allergic to anything."
- ●Weight before: "I was nearly fifteen stone and now I'm thirteen, eating normal home cooking before."
- ●Practical questions: If tests are suggested he asks whether he can come in on his day off.
Social History and Lifestyle Impact
- ●Work: Roofer for twenty five years, employed by a firm that does repairs and new builds. Carries slates, lead and bundles of tiles up ladders all day. "Heavy lifting, up and down, I'm built like a barn door."
- ●Home: Lives with Gaynor in a semi. Tyler is 26 and lives in his own flat.
- ●Lifestyle: Non smoker. About ten pints a week, mostly at the weekend. No drugs. Walks the dog most evenings.
- ●Impact: He has been snappy at home since the call and could not eat his tea. "Gaynor knows something's up."
If Asked: Associated Symptoms
Gating note: Answers are brief. All negative: swelling, breathlessness, chest pain, palpitations, blood or froth in the urine, reduced urine, difficulty passing urine, loin pain, fever, rash, joint pains, tiredness, itching, nausea, loss of appetite, muscle pain or dark urine after work, and weight loss apart from the diet.
Responses to Management (The Negotiation Phase)
- ●If the doctor explains that one result is not a diagnosis and that the test should be repeated, perhaps after avoiding meat:
- ●Reaction: Surprised, a little sceptical. "Meat? I live on chicken. What counts? And what about my shakes?" He asks how soon, and whether he can come in tomorrow. "So it could be wrong? How can a test be wrong?" He accepts once told cooked meat and muscle can push the number up. He asks about drinking. "Dad had to count every cup, so I thought kidneys meant drinking less?" He will drink properly once told normal drinking is wanted.
- ●If the doctor explains how diet, muscle and protein shakes can affect the creatinine, or mentions a different blood test (cystatin C):
- ●Reaction: Thoughtful. "So I'm all muscle and that makes it look worse?" Then, quietly: "I read shakes wreck your kidneys. Have I done damage that can't be put right?" If told the diet has definitely harmed them, he goes quiet: "So I did do it myself." If told there is nothing to worry about, he does not believe it. If told honestly that nobody can say yet and the repeat will show more, he steadies: "Fair enough, at least that's straight." He asks what the other blood test is for and whether it is more accurate.
- ●If the doctor declines a scan or specialist today and explains that kidney disease is only diagnosed if the problem lasts three months:
- ●Reaction: Pushes back at first. "Three months? I can't wait three months not knowing. Dad left it too late." He softens if the doctor takes his fear seriously, gives a clear plan with dates and says what would make things move faster. "So you're not brushing me off? What number would make you send me?" He also asks, "Can I carry on working? I'm up a ladder first thing tomorrow."
- ●If the doctor discusses a urine test, blood pressure checks, diabetes testing, or avoiding painkillers and other drugs that harm the kidneys:
- ●Reaction: Agreeable and practical. "Right, a wee sample, I can do that. Morning one is easy, I'm up early anyway. Can I keep taking the amlodipine? What about ibuprofen, I might need it for my back?" He will come for his blood pressure check and tests on his day off.
- ●If the doctor addresses his father's kidney problem and whether it runs in the family:
- ●Reaction: Quiet, then steadier. "He felt fine too, right up until they gave him the number." Once told that his father's kidneys were harmed by many years of uncontrolled diabetes, that early kidney problems give no symptoms so tests are the way to look, and that his own sugar was normal last year, he says, "So getting it checked now is the opposite of what Dad did." He asks if he could get diabetes himself and wants it checked. "What do I tell Gaynor?"
- ●If the doctor gives vague safety netting such as "come back if you are worried":
- ●Reaction: "Worried about what exactly? Give me the actual signs, and who do I ring at the weekend?" He wants a date for results. "Will somebody ring me, or do I have to chase?"
Mark Scheme
Domain 1: Data Gathering and Diagnosis
Domain 2: Clinical Management and Medical Complexity
Domain 3: Relating to Others
Clinical Learning Points
The Core Dilemma and the Model Plan
- ●Lloyd is a 54 year old roofer whose eGFR has fallen from 78 to 52 over two years, found at a blood pressure review. His father needed dialysis in his sixties because of diabetes; Lloyd believes the same has started in him and that his protein shakes did lasting damage, and wants a scan and a specialist today. The skill is to avoid both over investigation and false reassurance: one low result is not chronic kidney disease (CKD), but it must not be ignored.
- ●Model plan: take a history to exclude an acute cause and to find factors that distort creatinine; repeat the creatinine and eGFR promptly after avoiding meat; send an early morning urine ACR and test for blood; plan a further eGFR at three months to confirm or exclude CKD; discuss cystatin C with the laboratory or kidney team only if the picture stays borderline; check HbA1c and blood pressure; advise on medicines to avoid; address his fear about his father, the shakes and his work; give specific safety netting and a date for results.
- ●Also acceptable: repeating the blood test within about two weeks together with ACR at the same visit, asking him to book a longer appointment to go through the results, or involving the practice pharmacist or nurse for tests. A scan or urgent referral today is not needed on these facts.
One Result Is Not a Diagnosis
- ●NICE guideline NG203 defines CKD as abnormalities of kidney structure or function present for more than 3 months, including an eGFR below 60 on at least two occasions separated by at least 90 days, or markers of kidney damage such as an ACR above 3 mg/mmol.
- ●For an adult with a first eGFR below 60, NG203 says to repeat the test within 2 weeks, allowing for the biological and analytical variability of creatinine (about 5%). The aim is to exclude an acute fall, such as acute kidney injury, or the effect of starting a new medicine.
- ●Lloyd's drop from 78 to 52 is about a third: large enough to take seriously, small enough to be explained by non kidney factors. His eGFR places him in category G3a, but he cannot be labelled CKD at this stage.
Excluding Acute Kidney Injury and Other Acute Causes
- ●Ask about vomiting, diarrhoea, fever, reduced urine, recent infection, new medicines, and any heavy sweating or poor fluid intake. Lloyd has had no illness, but he sweats on the job and drinks little until he gets home, so mild dehydration is plausible.
- ●Ask about anti inflammatory painkillers, antibiotics, herbal remedies and supplements. He takes only amlodipine, the odd paracetamol and whey protein, and no ACE inhibitor, ARB or diuretic.
- ●Ask about urinary symptoms: blood, foam, frequency, nocturia, hesitancy, loin pain, stones and water infections. All are negative here, so obstruction, glomerular disease and stones are unlikely.
Why His Creatinine May Overestimate the Problem
- ●Creatinine comes from muscle and from cooked meat. NG203 says to interpret creatinine based eGFR with caution in people who use protein supplements, have high muscle mass or are acutely ill. A heavy manual worker with a muscular frame, two whey shakes a day and meat at every meal can have a higher creatinine without any change in kidney filtration.
- ●NG203 also advises adults not to eat any meat in the 12 hours before a blood test for eGFR creatinine. Lloyd ate a large steak the evening before and a bacon sandwich that morning.
- ●Low fluid intake can also temporarily raise creatinine. A high protein diet may increase glomerular filtration pressure, but it is not established that it harms healthy kidneys. Do not tell him that the diet has damaged his kidneys, and do not promise it is harmless.
The Repeat Test and the Urine Tests
- ●Repeat the creatinine and eGFR within about two weeks, with no meat for the preceding 12 hours, normal fluids and, ideally, a break from the shakes. Sooner contact is needed if he becomes unwell. If the repeat is clearly back near 78, the earlier result was most likely distorted.
- ●Measure the early morning urine ACR (NG203 recommends ACR, not protein dipstick, to detect proteinuria) and use a reagent strip for haematuria. A raised ACR of 3 mg/mmol or more, if confirmed on a second early morning sample for results between 3 and 70, is a marker of kidney damage in its own right.
- ●An HbA1c is reasonable given his father's diabetes and his weight change. Lipids can be added when estimating cardiovascular risk.
Confirming CKD and When Cystatin C Helps
- ●If the repeat eGFR is still below 60, repeat it again so that two results are at least 90 days apart. CKD is diagnosed if the eGFR remains below 60 for at least three months or if ACR or another marker of kidney damage is present.
- ●Cystatin C is not affected by muscle mass or meat intake in the way creatinine is. The 2014 NICE guideline advised considering a cystatin C based eGFR when the creatinine eGFR was 45 to 59 for 90 days with no proteinuria or other marker of damage, and not diagnosing CKD if the cystatin C eGFR was above 60. NG203 (2021) removed that recommendation because evidence for its accuracy in UK practice was weak and it may add false negatives. It is therefore not a routine primary care test. For a muscular man on protein supplements whose repeat creatinine eGFR stays between 45 and 59 with a normal ACR, discussing a cystatin C eGFR with the local laboratory or renal team is reasonable where it is available; naming why creatinine may mislead matters more than the test itself.
Blood Pressure, Medicines and Treatment if CKD Is Confirmed
- ●Continue amlodipine and recheck his blood pressure. For adults with CKD and an ACR below 70 mg/mmol, NG203 gives a clinic systolic target below 140 mmHg (range 120 to 139) and a diastolic below 90 mmHg. If CKD is confirmed with hypertension and an ACR above 30 mg/mmol, an ACE inhibitor or ARB is offered.
- ●Offer atorvastatin 20 mg for primary prevention if CKD is confirmed (NICE NG238).
- ●Advise avoiding anti inflammatory painkillers and checking with a pharmacist before buying medicines.
Scan and Referral: Why Not Today
- ●NG203 recommends renal ultrasound for adults with CKD who have accelerated progression, visible or persistent invisible haematuria, symptoms of urinary tract obstruction, a family history of polycystic kidney disease with age above 20, an eGFR below 30, or when a nephrologist expects a biopsy. Lloyd has none of these.
- ●Refer for specialist assessment if, for example, the 5 year risk of needing renal replacement therapy exceeds 5%, ACR is 70 mg/mmol or more, ACR is above 30 mg/mmol with haematuria, or eGFR falls by 25% or more with a change in category, or by 15 ml/min/1.73 m2 or more in a year. Explain what would change the plan so he does not feel dismissed.
Responding to His Fear About His Father and the Shakes
- ●His father had diabetes from his forties, never controlled it, and developed kidney failure in his sixties. That is a different route to kidney damage from Lloyd's, whose blood sugar was normal last year. A relative with kidney failure is a reason to test him, but one result does not show he will follow the same course.
- ●His sharpest fear is that he feels fine, as his father said he did until a doctor read him a number. Explain that early kidney disease usually causes no symptoms, so blood and urine tests are the right way to look, and that being checked early is the opposite of what his father did. Avoid "you will be fine" before results.
- ●He also blames himself for the shakes he read "wreck your kidneys". Use the honest line from section 4: diet can distort the number, nobody can say yet whether any harm is lasting, and the repeat will show more. Do not blame him or promise it is harmless.
- ●Ask what he fears for his work. One eGFR of 52 without symptoms is no reason to stop roofing while tests are done, if he drinks regularly on site; a rapid fall on the repeat, or feeling unwell, would change that. Most people with early CKD never need dialysis.
Common Mistakes in This Station
- ●Telling him he has CKD, or rules it out, on a single result.
- ●Booking a scan or urgent referral today because he asks, with no explanation of what would change that.
- ●Repeating the test without advice about meat, shakes and fluids.
- ●Forgetting the urine ACR, or using a dipstick alone to assess protein.
- ●Not asking about anti inflammatory painkillers and supplements.
- ●Ignoring his father's story and his fear that the shakes did lasting damage, or reassuring him before any results.
- ●Blaming the diet outright, or stopping amlodipine.
- ●Vague safety netting and no date for results.
Mapped to the RCGP curriculum topic: Renal and Urology.
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