Blog — Clinical Spanish

Renal failure in Spanish: the creatinine conversation, dialysis education, and the patient who says “mis riñones están trabajando mal”

A GFR of 18 is not a percentage of life remaining. It is a filtering speed. But many Spanish-speaking patients hear “18%” and do the arithmetic they weren’t supposed to do. Three failure modes for kidney-failure conversations across the language barrier: the creatinine number without a framework, the GFR percentage that sounds like a death sentence, and the dialysis conversation that starts with the machine before the patient knows what dialysis replaces.

The woman who thought 18 percent meant 18 percent of her life

Rosa Delgado is 58. She has had CKD for three years — first diagnosed when a routine blood panel came back with a creatinine of 2.1 and nobody explained what that number meant. Her chart says “educated re: CKD management.” She has been attending her nephrology appointments and taking her medications.

At today’s visit, her creatinine is 4.2. Her GFR is 18. The nephrologist tells her: “Sus riñones están funcionando al 18%. Ya estamos en etapa 4 de la enfermedad. Vamos a empezar a hablar de diálisis.”

The nephrologist leaves. You come into the room to prep Rosa for the next appointment. She looks at the wall, not at you. After a moment she asks, very quietly:

“¿Cuánto tiempo me queda?”

How much time do I have left.

She heard 18% and did the only math available to her: 18% of a normal lifespan. She did not know that GFR is a filtration speed, not a life-expectancy ticker. She did not know that stage 4 CKD, managed well, can remain stable for years. She did not know that the dialysis conversation was about planning ahead, not about imminent failure.

She had been nodding through every appointment for three years and none of the numbers had ever had a framework.

“Mis riñones están trabajando mal” — a phrase that covers everything

The phrase mis riñones están trabajando mal (my kidneys are working badly) is used by Spanish-speaking patients to describe everything from a GFR of 62 to end-stage renal disease requiring three-times-weekly hemodialysis. It is a lay description of dysfunction, not a staging system. Before any clinical teaching, you need to know which conversation you are actually having.

The orientation questions:

“¿Cuándo le dijeron por primera vez que tenía un problema con los riñones?”
(When were you first told you had a kidney problem?)

“¿Le han dicho cuánto por ciento están funcionando sus riñones?”
(Have they told you what percentage your kidneys are functioning at?)

“¿Le dijeron en qué etapa está?”
(Did they tell you what stage you are at?)

A patient who says “me dijeron que estoy al 60%” is in stage 3a or 3b. A patient who says “me dijeron que estoy muy mal, que ya necesito diálisis” is stage 5 or already ESRD. The phrase trabajando mal does not distinguish between them. Your clinical teaching must be calibrated to which stage you are actually managing — because a stage 3 conversation about slowing progression is completely different from a stage 5 conversation about access planning.

The five-stage framing in plain Spanish:

• Etapas 1–2 (GFR > 60): “Sus riñones funcionan bien, pero tienen un daño que hay que vigilar de cerca.” (Your kidneys are functioning well, but there is damage we need to monitor closely.)
• Etapa 3 (GFR 30–59): “Sus riñones están trabajando al 30–60% de lo normal — siguen haciendo su trabajo, pero con menos fuerza. Aquí es cuando las medidas para cuidarlos marcan la diferencia.” (Your kidneys are working at 30–60% of normal — they are still doing their job, but with less strength. This is when protective measures make the difference.)
• Etapa 4 (GFR 15–29): “Sus riñones están al 15–29%. Siguen trabajando, pero aquí es cuando empezamos a planificar para el futuro.” (Your kidneys are at 15–29%. They are still working, but this is when we start planning for the future.)
• Etapa 5 / IRCT (GFR < 15): “Sus riñones ya no pueden filtrar suficiente solos — necesitan apoyo para hacer ese trabajo. La diálisis o el trasplante hacen lo que los riñones ya no pueden hacer.” (Your kidneys can no longer filter enough on their own — they need support to do that work. Dialysis or a transplant does what the kidneys can no longer do.)

Notice the language: never “sus riñones fallaron” (your kidneys failed) in early stages. Fallaron sounds final. Save that framing for the conversation where it is accurate. In stage 3 and early stage 4, the kidneys are failing gradually — the clinical word is “progressive CKD” — but a patient who hears sus riñones fallaron may disengage from management because they believe the outcome is fixed.

Three failure modes for kidney-failure conversations in Spanish

1. The creatinine number without a framework

“Su creatinina está en 4.2.” To a patient who has never heard of creatinine, this is a number with no axis. It has no normal range they can compare it to, no physical mechanism, and no connection to the symptoms they are or are not feeling. Telling a patient their creatinine and not explaining what creatinine is produces the same result as telling them their voltage drop across a transistor: they will nod, write it down, and continue with no functional understanding.

The three-step sequence that builds the framework before the number:

Step 1: What kidneys do.

“Los riñones filtran la sangre — sacan los desechos y el líquido extra, como si fueran un filtro de agua pero para la sangre. Con cada latido del coraón, una parte de la sangre pasa por los riñones para limpiarse. Los desechos salen por la orina y el agua extra también.”
(The kidneys filter the blood — they remove waste and extra fluid, as if they were a water filter but for blood. With each heartbeat, some blood passes through the kidneys to be cleaned. The waste comes out in urine and extra water too.)

Step 2: What creatinine is.

“La creatinina es un desecho que produce el músculo cada vez que trabaja — cuando camina, cuando levanta algo, cuando hace cualquier esfuerzo. Los riñones sanos la sacan de la sangre y la mandan a la orina. Cuando los riñones no filtran bien, la creatinina se acumula en la sangre en lugar de salir.”
(Creatinine is a waste product the muscle produces every time it works — when you walk, when you lift something, when you make any effort. Healthy kidneys remove it from the blood and send it to urine. When the kidneys do not filter well, creatinine builds up in the blood instead of coming out.)

Step 3: What the number means.

“Lo normal para la mayoría de los adultos es menos de 1.2. El suyo está en 4.2 — eso significa que hay más desecho en la sangre de lo que debería haber. No lo está sintiendo todavía porque el cuerpo se adapta. Pero cuando el número sube suficiente, empieza a sentir cansancio, náusea, y confusión — eso se llama uremia.”
(Normal for most adults is below 1.2. Yours is at 4.2 — that means there is more waste in the blood than there should be. You are not feeling it yet because the body adapts. But when the number rises enough, you start to feel fatigue, nausea, and confusion — that is called uremia.)

Now — and only now — the GFR number lands with a framework:

“El GFR le dice a qué velocidad filtran sus riñones comparado con lo que debería ser. Un GFR de 18 significa que están filtrando al 18% de la velocidad normal. No es un porcentaje de vida que le queda — es la velocidad del filtro. Gente con GFR de 18 vive años con el manejo correcto.”
(The GFR tells you at what speed your kidneys are filtering compared to what they should be. A GFR of 18 means they are filtering at 18% of normal speed. It is not a percentage of life remaining — it is the speed of the filter. People with a GFR of 18 live years with the right management.)

That last sentence is the one Rosa needed to hear before her appointment ended. It needed to be said explicitly, not inferred.

For the full framework for explaining any abnormal lab value — BUN, potassium, phosphorus, hemoglobin — see How to explain lab results in Spanish.

2. The GFR percentage that sounds like a death sentence

The “18% of life remaining” misread is not a rare error. It is a predictable consequence of delivering a percentage with no explanatory frame. The human brain pattern-matches percentages to completion: a 20% battery is almost dead. A tank at 18% is almost empty. A body at 18% is —

The correction requires two moves, not one. The first move is the reframe: it is a filter speed, not a life fraction. The second move is giving Rosa a concrete referent for what “stage 4, plan now” actually means in practical terms.

“La etapa 4 significa que tenemos tiempo para planificar bien. Eso es exactamente por qué hablamos de diálisis ahora y no en la sala de emergencia. Hablar de esto hoy no significa que lo necesita mañana — significa que usted va a poder elegir qué tipo prefiere y prepararse con tiempo.”
(Stage 4 means we have time to plan well. That is exactly why we are talking about dialysis now and not in the emergency room. Talking about this today does not mean you need it tomorrow — it means you will be able to choose which type you prefer and prepare with time.)

The phrase “prepare with time” (prepararse con tiempo) is doing significant clinical work here. It positions the current conversation as a form of respect — we are telling you early because we want you to have agency — rather than as a terminal announcement.

The related conversation on delivering serious diagnoses across the language barrier — including the “polite yes” trap and the teach-back that confirms comprehension — is covered in How to explain a new diagnosis in Spanish.

3. The dialysis conversation that starts with the machine

“Va a necesitar diálisis.”
(You are going to need dialysis.)

What many Spanish-speaking patients hear when they receive this sentence: a machine. Three times a week. A center. The neighbor who went on dialysis and never seemed the same afterward. The cousin who died two years after starting. The end of working, traveling, being a person who makes their own schedule.

The clinical conversation and the patient’s internal conversation have decoupled at the word “diálisis.” The nurse can continue explaining, but the patient has stopped processing new information.

The sequence that keeps the conversation open:

First: what dialysis replaces.

“La diálisis hace el trabajo que sus riñones ya no pueden hacer solos — filtra la sangre, saca el líquido extra, y equilibra los minerales. No cura la enfermedad, pero hace que el cuerpo se sienta bien aunque los riñones no estén trabajando bien. Es un apoyo, no un final.”
(Dialysis does the work your kidneys can no longer do alone — it filters the blood, removes extra fluid, and balances minerals. It does not cure the disease, but it makes the body feel well even when the kidneys are not working well. It is a support, not an ending.)

Second: that there are two types.

“Hay dos tipos de diálisis, y los dos hacen el mismo trabajo pero de manera diferente. La hemodiálisis se hace en un centro de diálisis tres veces por semana, unas cuatro horas cada vez. La diálisis peritoneal se puede hacer en casa, a diario, con un proceso más corto. Las dos funcionan — la elección depende de su vida, no de cuál es más fácil para nosotros.”
(There are two types of dialysis, and both do the same work but differently. Hemodialysis is done at a dialysis center three times a week, about four hours each time. Peritoneal dialysis can be done at home, daily, with a shorter process. Both work — the choice depends on your life, not on which is easier for us.)

That last clause — la elección depende de su vida, no de cuál es más fácil para nosotros — is not incidental. Spanish-speaking patients in nephrology care are disproportionately initiated on hemodialysis in the US, partly because PD is systematically less presented as an option. Naming PD explicitly equalizes the default.

Third: the access conversation.

For hemodialysis:

“Para la hemodiálisis, el cuerpo necesita un acceso especial — un lugar para conectar la máquina a la sangre. La fístula es una pequeña cirugía en el brazo donde el cirujano une una vena con una arteria. Eso hace que la vena crezca y se fortalezca. Se hace con meses de anticipación para que esté lista cuando la necesite.”
(For hemodialysis, the body needs a special access — a place to connect the machine to the blood. The fistula is a small surgery in the arm where the surgeon connects a vein to an artery. That makes the vein grow and strengthen. It is done months in advance so it is ready when you need it.)

For peritoneal dialysis:

“Para la diálisis peritoneal, el cirujano coloca un tubo delgado y suave en el abdomen — por dentro del ombligo pero hacia abajo. Por ese tubo entra el líquido de diálisis y sale. Se cicatriza en dos a cuatro semanas antes de empezar. Una vez listo, usted lo hace en casa — se conecta de noche mientras duerme, o en intercambios durante el día.”
(For peritoneal dialysis, the surgeon places a thin, soft tube in the abdomen — inside below the navel. Through that tube the dialysis fluid enters and exits. It heals over two to four weeks before starting. Once ready, you do it at home — connecting overnight while you sleep, or in exchanges during the day.)

The question that opens the conversation after both modalities are named:

“Ahora que le expliqué los dos tipos, ¿tiene preguntas? ¿Hay algo de lo que escuchó que le preocupa especialmente?”
(Now that I’ve explained both types, do you have questions? Is there something you heard that is worrying you specifically?)

This question surfaces the neighbor with hemodialysis, the cousin who died, the fear about travel, the concern about work. Those fears are the actual conversation the patient has been waiting to have.

For the clinical Spanish vocabulary specific to nephrology units, see Spanish for dialysis nurses.

The dietary restrictions that hit Latin American diets hardest

The CKD diet is one of the most complex medical diets in clinical practice. It restricts potassium, phosphorus, and sodium simultaneously, and in advanced CKD adds fluid restriction on top. For patients eating traditional Mexican and Central American diets, the potassium and phosphorus restrictions hit the staple foods — frijoles, papas, plátanos, aguacate, jitomate — not the fried chicken from a fast-food menu.

Potassium: name the foods before you name the restriction

Do not say “avoid high-potassium foods” before naming what they are. Most patients have never heard of potassium and do not know what foods contain it. The sequence:

“El potasio es un mineral que los riñones sanos sacan de la sangre. Cuando los riñones fallan, el potasio se acumula, y cuando está muy alto puede causar un ritmo de corazón peligroso. Los alimentos que tienen más potasio son los frijoles, las papas y el camote, el plátano o guineo, el aguacate, el jitomate, la mayoría de las frutas secas, y el jugo de naranja o tomate.”
(Potassium is a mineral that healthy kidneys remove from blood. When kidneys fail, potassium builds up, and when it is very high it can cause a dangerous heart rhythm. The foods with the most potassium are beans, potatoes and sweet potato, banana, avocado, tomato, most dried fruits, and orange or tomato juice.)

Then the bridge that keeps the conversation realistic:

“Esto no significa que nunca puede comerlos — significa que las porciones importan. Y hay una técnica para los frijoles y las papas: remójelos en agua fría por lo menos cuatro horas antes de cocinarlos, tire esa agua, y cuézalos en agua nueva. Eso reduce bastante el potasio. Se llama la técnica de lixiviación.”
(This does not mean you can never eat them — it means portions matter. And there is a technique for beans and potatoes: soak them in cold water for at least four hours before cooking, discard that water, and cook them in fresh water. That significantly reduces the potassium. It is called the leaching technique.)

The leaching technique is real, clinically validated, and specifically relevant to patients whose diet centers on frijoles de olla. A dietitian who does not name frijoles explicitly will be teaching potassium restriction to a patient who eats them twice a day and walks out thinking the restriction applies to someone else’s diet.

Phosphorus: the soda problem nobody mentions

Phosphorus restrictions cover dairy, nuts, whole grains, organ meats — and cola sodas. The phosphoric acid in Pepsi and Coca-Cola is rapidly absorbed (more so than the phosphorus in natural foods) and is a significant phosphorus load for dialysis patients. Many patients are not told this:

“El fósforo viene principalmente de los lácteos, las nueces, los cereales integrales, y — esto sorprende a muchos — los refrescos de cola como el Pepsi y el Coca-Cola. El ácido fosfórico de la soda el cuerpo lo absorbe diferente al fósforo natural de los alimentos. Para los riñones que ya no filtran bien, esa diferencia importa.”
(Phosphorus comes mainly from dairy, nuts, whole grains, and — this surprises many people — cola sodas like Pepsi and Coca-Cola. The phosphoric acid in soda is absorbed differently by the body than the natural phosphorus in food. For kidneys that no longer filter well, that difference matters.)

Fluid restriction: the patient who is thirsty

Fluid restriction is the restriction that feels like punishment. Stage 5 and dialysis patients are often told “1,500 mL per day” — a number that means nothing until you translate it into physical terms:

“Una botella de agua grande como las de 1.5 litros — eso es todo el líquido para el día, incluyendo el caldo, el café, los jugos, la leche, los líquidos de la comida. Todo cuenta. No solo el agua que toma directamente.”
(A large water bottle like the 1.5-liter ones — that is all the fluid for the day, including broth, coffee, juices, milk, liquids in food. Everything counts. Not just the water you drink directly.)

The caldo note is critical for patients whose primary meal is a bowl of soup. A patient on fluid restriction who eats caldo de res every day is consuming significant fluid in the broth. This is rarely covered in standard fluid-restriction counseling and almost never covered in the translated handout.

The thirst management question — what to do when you are thirsty but already at your fluid limit:

“Si tiene sed pero ya llegó a su límite, hay formas de manejar la sed sin tomar más líquido: un cubo de hielo que se derrite en la boca cuenta como menos líquido que un vaso de agua. Un peu de dulce ácido estimula la saliva. Enjuagarse la boca con agua y escupirla alivia sin agregar líquido.”
(If you are thirsty but have already reached your limit, there are ways to manage thirst without drinking more: an ice cube that melts in the mouth counts as less fluid than a glass of water. A small sour candy stimulates saliva. Rinsing your mouth with water and spitting it out relieves without adding fluid.)

Always defer the complete dietary prescription to the renal dietitian. The nurse’s role in this conversation is to introduce the concepts and name the culturally specific foods before the first dietitian visit — so the patient walks in knowing that the dietitian is going to address frijoles and caldo, not assuming the standard handout applies to someone else.

The CKD patient who is not following the diet — three reasons to ask about before assuming noncompliance

A Spanish-speaking CKD patient whose potassium is chronically elevated is documented as “noncompliant with diet” more often than a similar patient from a non-Latino background. Before that label is applied, three questions:

1. Does the patient know which foods to restrict by name?

“¿Qué alimentos le dijeron que debe limitar por el potasio? ¿Me puede decir cuáles son?”
(What foods were you told to limit because of potassium? Can you tell me which ones?)

If the patient cannot name specific foods, the education did not happen in a form they retained. This is a teaching failure, not a compliance failure.

2. Does the patient understand why the restriction matters?

“¿Le explicaron por qué el potasio alto es peligroso — qué le puede pasar al cuerpo?”
(Were you explained why high potassium is dangerous — what it can do to the body?)

A patient who does not know that elevated potassium can cause a fatal arrhythmia will not prioritize a restriction that means stopping frijoles. The “why” is the compliance lever. The food list alone is not.

3. Does the patient have access to the alternative foods?

The CKD diet in many clinic handouts lists low-potassium alternatives that are common in standard US diets but not in the local tienda: apples over bananas, white bread over tortillas de maíz (corn tortillas are lower in potassium than flour tortillas, and both are lower than beans — but this nuance is rarely in the handout), white rice over whole grains. Asking what is available at the patient’s regular grocery source is not extra — it is clinical.

For the medication history that surfaces adherence barriers — including patients on phosphate binders who are not taking them with meals — see Medication reconciliation in Spanish. For the broader framework on delivering complex diagnoses across the language barrier and confirming comprehension, see Discharge instructions in Spanish.

The dialysis patient who is a long-term patient in your unit

A brief note on patients who have been on hemodialysis for years and whose chart shows full Spanish-only. These patients know more clinical Spanish than most nurses who see them for the first time. They have been coming to the same center three times a week, they know their access by name, they know what their dry weight is and why it matters. The failure mode here is not teaching too little — it is the first-session nurse who explains the entire hemodia­lysis process to a patient who has been doing it for four years.

The orientation question before any teaching with a returning dialysis patient:

“¿Cuánto tiempo lleva en diálisis? ¿Qué tiene más preguntas hoy — sobre la máquina, los líquidos, los medicamentos, la dieta, o algo más?”
(How long have you been on dialysis? What do you have the most questions about today — the machine, fluids, medications, diet, or something else?)

This question does two things: it prevents condescending over-explanation to an experienced patient, and it opens a directed conversation about what they actually want from the encounter.

For a full vocabulary reference for dialysis nursing in Spanish — access sites, fluid removal terms, machine alarms, weight check phrases — see Spanish for dialysis nurses. For the goals-of-care conversation when CKD progresses to end-stage and the patient begins hospice discussions, see Advance directives in Spanish. For the connection between T2D as the leading cause of CKD and the Spanish-language diabetes education that prevents progression, see Diabetic emergency in Spanish.

Practice what you’ve read. ClinicaLingo’s AI-voiced patient scenarios include nephrology and chronic-disease encounters — creatinine explanations, dialysis education, dietary counseling across cultural contexts. Try the practice scenarios.