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Oxygen-carrying red blood cells

Hemoglobin at anemia

Low hemoglobin is common in CKD and dialysis, but it is not always an EPO problem. Iron availability, blood loss, inflammation, vitamin B12 or folate, nutrition, dialysis adequacy and other causes may need review.

KidneyTalksPH Editorial7 min readChecked September 21, 2026

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Hemoglobin carries oxygen

Low hemoglobin may need iron studies and a wider anemia assessment.

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Hemoglobin is the oxygen-carrying protein in red blood cells. Anemia is common in later-stage CKD and kidney failure, but a low hemoglobin result is a finding—not the complete diagnosis.

In dialysis, low hemoglobin can come from more than low erythropoietin. Iron deficiency, blood loss during treatment or repeated blood tests, inflammation or infection, low vitamin B12 or folate, inadequate nutrition, inadequate dialysis, hyperparathyroidism and other medical causes can contribute. The 2026 KDIGO anemia guideline recommends looking for correctable causes rather than responding to hemoglobin alone.

What symptoms can anemia cause?

Fatigue, weakness, shortness of breath, dizziness, palpitations, headaches and reduced exercise tolerance can happen with anemia. But the same symptoms can have other causes, including fluid overload, heart or lung problems, infection and low blood pressure.

If symptoms are new, severe or worsening, they deserve assessment rather than assuming they are 'just dialysis fatigue.'

Before increasing EPO: check why hemoglobin is low

More EPO is not always the answer. If the body does not have enough usable iron, vitamin B12 or folate—or if there is ongoing blood loss or inflammation—the response to an ESA can be poor.

Useful checks commonly include CBC indices, ferritin and transferrin saturation (TSAT), and when clinically indicated vitamin B12, folate, reticulocyte count and evaluation for bleeding, infection or inflammation. Dialysis adequacy and access-related blood loss may also need review.

KDIGO advises addressing correctable causes of anemia, including iron deficiency, before or alongside ESA treatment.

Practical points

  • ✓Ask for the hemoglobin trend, not just one result.
  • ✓Ask whether ferritin and TSAT suggest low iron stores or poor iron availability.
  • ✓Report black stools, visible bleeding, frequent nosebleeds, unusually heavy menstruation or repeated bleeding from the dialysis access.
  • ✓If hemoglobin is not responding as expected, ask whether infection, inflammation, inadequate dialysis, malnutrition, B12/folate deficiency or another cause has been considered.

Ano ang puwedeng kainin para makatulong sa paggawa ng dugo?

Food can support red-blood-cell production when nutrition or a nutrient deficiency is part of the problem, but food alone usually cannot correct dialysis-related EPO deficiency or significant iron deficiency. A kidney dietitian can help fit anemia-friendly foods around your potassium, phosphorus, fluid, diabetes and protein needs.

Iron-rich choices that may fit a dialysis diet include appropriately portioned lean beef, pork, chicken or fish. Animal-source iron is generally absorbed more efficiently than plant-source iron. Fortified cereals or grains can also contribute iron, but labels should be checked for sodium, sugar and phosphate additives.

Folate and vitamin B12 are also needed for red blood cells. B12 is found mainly in animal foods such as meat, fish, eggs and dairy; folate is found in foods such as leafy vegetables, beans and fortified grains. Some plant foods can be high in potassium or phosphorus, so the right choice depends on your labs.

A small amount of vitamin-C-containing food with an iron-containing meal may help iron absorption. For dialysis patients, choose options and portions that fit potassium and fluid limits rather than automatically using large amounts of orange juice or supplements.

Practical points

  • ✓Prioritize adequate protein if you are on dialysis; under-eating can worsen nutrition and make recovery harder.
  • ✓Choose fresh or minimally processed protein more often than processed meats because processed foods can be high in sodium and phosphate additives.
  • ✓If potassium is high, do not add large servings of high-potassium fruit or juice just for vitamin C; ask for lower-potassium options.
  • ✓If phosphorus is high, check processed foods for ingredients containing 'phos' and discuss portions of dairy, beans, nuts and organ meats with a renal dietitian.

Ano ang hindi magandang gawin para lang tumaas ang hemoglobin?

Do not self-start high-dose iron, folic acid, vitamin B12, vitamin C, herbal 'blood builders' or other supplements just because hemoglobin is low. CKD changes how some nutrients are handled, and excess supplements can cause harm or interfere with treatment.

Do not rely on one 'blood-building' food such as liver, beetroot or a juice regimen as a substitute for anemia work-up. Liver and organ meats can be high in phosphorus, and juices can add potassium, sugar and fluid.

Do not drastically restrict protein because BUN is high if you are on dialysis. Dialysis patients often need adequate protein, and severe dietary restriction can worsen malnutrition.

Blood transfusion is sometimes necessary for severe or urgent anemia, but in people who may pursue kidney transplant, unnecessary transfusions are generally avoided when possible because they can cause HLA sensitization and make donor matching more difficult.

What can be done besides IV iron and EPO?

The answer depends on the cause. Correcting blood loss, treating infection or inflammation, replacing documented vitamin B12 or folate deficiency, improving nutrition, checking dialysis adequacy and addressing other reversible causes can all matter.

Some dialysis patients may be candidates for newer oral HIF-prolyl hydroxylase inhibitor therapy depending on the country, clinical situation and local approval, but this is a prescription decision for the nephrologist—not a substitute for finding the cause of anemia.

If a dialysis circuit repeatedly retains blood, the access bleeds for a long time after needles are removed, or frequent blood sampling is occurring, tell the dialysis team. Small repeated blood losses can add up.

Practical points

  • ✓Make sure the dialysis session is being completed as prescribed and ask about adequacy (for example Kt/V or URR) if anemia is difficult to control.
  • ✓Review medicines and supplements with the nephrologist; some conditions or treatments can affect red-cell production or bleeding risk.
  • ✓Ask whether nutrition markers, appetite and weight trend suggest inadequate intake.
  • ✓If transplant is a goal, remind the team before non-urgent transfusion decisions.

ESA and iron treatment are individualized

Some CKD and dialysis patients receive erythropoiesis-stimulating agents and IV or oral iron. Doses are adjusted using hemoglobin trend, iron status, symptoms and individual risks.

The goal is not to push hemoglobin as high as possible. ESA treatment has important cardiovascular and clotting risks, so targets and dose changes should follow the treating nephrology team rather than a generic online number.

Practical points

  • ✓Keep a simple record of hemoglobin, ferritin, TSAT, ESA dose and iron doses so trends are easier to discuss.
  • ✓Ask why a dose is being changed rather than focusing only on the number.
  • ✓Do not skip or double ESA or iron doses without instruction.

When to seek urgent help

Chest pain, fainting, severe shortness of breath, a very fast or irregular heartbeat, major bleeding, or profound weakness can require urgent medical assessment.

A critical hemoglobin result should be handled according to the instructions of the treating team or emergency service, especially if symptoms or active bleeding are present.

Key takeaway

Low hemoglobin in dialysis is not an EPO-only problem. The practical approach is to check iron availability, blood loss, B12/folate, inflammation or infection, nutrition, dialysis adequacy and other reversible causes—then treat the cause while keeping food choices compatible with potassium, phosphorus and fluid limits.

Magandang itanong sa doctor o dialysis team

  • ?How is my hemoglobin trending, and what target is appropriate for me?
  • ?What are my ferritin and TSAT, and do they suggest low iron stores or low available iron?
  • ?Should vitamin B12, folate, reticulocyte count or other tests be checked in my case?
  • ?Could blood loss from dialysis, my access, the stomach or bowel, or frequent blood tests be contributing?
  • ?Is my dialysis adequacy satisfactory, and could inflammation, infection, nutrition or hyperparathyroidism be affecting my response to ESA?
  • ?What foods can I add safely based on my potassium, phosphorus and fluid limits?
Urgent safety note: Chest pain, fainting, severe shortness of breath, very fast or irregular heartbeat, major bleeding, or a hemoglobin result your clinical team labels critical needs prompt medical assessment.
Medical safety: Paliwanag ito sa test, hindi interpretation ng personal result mo. Huwag baguhin ang medicines, supplements, dialysis prescription o diet base sa guide lang. Gamitin ang treating clinical team para sa individual interpretation.

Clinical references

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