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How aplastic anaemia is graded: severe, very severe and non-severe | CION Cancer Clinics
Aplastic anaemia is graded severe when the marrow biopsy shows less than 25% of normal working tissue and at least two counts are low: neutrophils below 0.5 × 10⁹/L, platelets below 20 × 10⁹/L, or reticulocytes below 20 × 10⁹/L. Very severe adds neutrophils below 0.2 × 10⁹/L. This page explains each grade, and what it does not tell you. At CION Cancer Clinics, our haematologist cares for anaemia, bleeding, clotting and inherited blood disorders, with ArogyaSri, CGHS and cashless insurance accepted.
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Medically reviewed by Dr. Basudev PokhrelConsultant Haematologist · last reviewed September 2026, next review due September 2027
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The short answer
What makes aplastic anaemia "severe"?
Aplastic anaemia is called severe when the bone marrow biopsy shows less than 25% of the normal working marrow, and at least two of three blood counts have fallen below set levels. Those three counts are the neutrophils, the platelets and the reticulocytes.
The three counts, in plain words
Neutrophils are the white cells that fight bacteria. Platelets are the small cells that stop bleeding. Reticulocytes are young red cells, and they show whether the marrow is still making new red cells at all. For severe disease, the neutrophils are below 0.5 × 10⁹/L, the platelets are below 20 × 10⁹/L, and the reticulocytes are below 20 × 10⁹/L. Two of the three are enough.
Why a grade is given at all
The grade is not a label for its own sake. It tells your haematologist how urgently treatment needs to start and which treatments are worth discussing first. It also helps the team plan how closely to watch you for infection and bleeding while decisions are made.
Why the marrow test matters as much as the blood test
Low counts in the blood can have many causes, including a vitamin shortage, a viral illness or a blood cancer. The marrow sample shows whether the marrow is truly empty, or busy but struggling. The grade is only given once both pieces are in place.
Reference ranges and reporting units differ between laboratories. A single result is always read alongside your symptoms and repeat tests.The grades
What are the three grades of aplastic anaemia?
Every grade starts with a marrow that has too few working cells. What separates them is how low the blood counts have gone.
Non-severe
The marrow is emptier than it should be, and the counts are low, but they do not meet the severe cut-offs. Some people stay stable for a long time. Others need support with transfusions, or treatment if the counts keep falling.
What usually follows
- Regular blood counts to spot a downward trend
- Treatment if you need frequent transfusions
Severe
The marrow shows less than 25% of normal working tissue, and at least two of the three counts are below the severe levels. This grade usually leads to a treatment decision within weeks, not months.
What usually follows
- A transplant assessment, including a search for a matched family donor
- A discussion of immune-suppressing treatment
Very severe
Everything in the severe grade, with a neutrophil count below 0.2 × 10⁹/L. At this level the body has almost no defence against bacteria, so an ordinary infection can become dangerous quickly.
What usually follows
- Strict precautions against infection
- Urgent planning of definitive treatment
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What cannot wait for the next appointment
If you or your family member has aplastic anaemia and develops a fever, shivering, bleeding that will not stop, black stools, or sudden severe headache, go to the nearest emergency department now or call 108. Say that the person has aplastic anaemia with low counts. Do not wait to see whether the fever settles at home, and do not take a painkiller first to bring it down.
How it is decided
How does the team work out your grade?
A full blood count
This gives the haemoglobin, white cells, neutrophils and platelets. A reticulocyte count is added to see whether new red cells are being made. The test is often repeated to confirm the pattern.
A blood film
A specialist looks at your blood under the microscope. This helps rule out abnormal cells that would point to a different illness, such as a leukaemia.
Bone marrow sample and biopsy
A small sample of marrow and a core of bone are taken from the back of the hip under local anaesthetic. The core shows how full or empty the marrow is. That fullness is called cellularity.
Extra tests to rule out look-alikes
Tests for PNH, inherited marrow failure, vitamin levels and viral infections are usually sent. Some take a few weeks to come back, and the grade is confirmed once the key results are in.
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On your report
What do the words on the report mean?
- Hypocellular marrow
- The marrow has fewer working cells than expected for your age. It is the key finding in aplastic anaemia, but not proof of it on its own.
- Cellularity
- How much of the marrow space is filled with blood-making cells, given as a percentage. The rest is mostly fat.
- ANC (absolute neutrophil count)
- The number of neutrophils in your blood. This is the count that separates severe from very severe.
- Reticulocyte count
- The number of young red cells. A very low count means the marrow is barely making red cells.
- Pancytopenic picture
- Your report may use this phrase. It means low counts across all three main blood cell types at once.
- PNH clone
- A small group of blood cells with a particular change. It is common in aplastic anaemia and is watched over time.
Commonly believed
What do families often get wrong about the grade?
"Severe aplastic anaemia is a kind of blood cancer."
It is not a cancer. In most cases the immune system is attacking the marrow's own blood-making cells. It is treated by haematologists, sometimes in the same units as blood cancers, which is why families often assume the two are the same thing.
"If the haemoglobin is fine after a transfusion, the grade has improved."
A transfusion lifts the counts for a while, but it does not change what the marrow is doing. The grade is based on the counts and the marrow picture, read by your team over time, not on one good result after a transfusion.
"Non-severe means we can ignore it."
Non-severe disease still needs regular follow-up. Counts can drift down over months, and some people move into the severe grade. Missing blood tests is how that change gets missed.
"Tonics and diet changes can lift the counts."
No food or tonic restarts an empty marrow. Some herbal products can affect the liver or kidneys and make later treatment harder. Tell your haematologist about anything you are taking.
Reading it honestly
What does the grade not tell you?
The grade does not tell you how your own illness will go. It is a way of sorting people so that treatment can be matched to how low the counts are. Two people with the same grade can respond very differently.
What shapes the outlook instead
Your age, your general health, how quickly treatment starts, whether a matched donor is available and how you respond to the first treatment all matter. Infections before treatment matter too. This page cannot weigh those for you. Your haematologist can, and it is fair to ask them to explain their thinking.
Who this grading does not fit neatly
Children, people with a suspected inherited marrow condition, and people whose marrow shows early signs of another disorder may need a different set of tests before any grade is applied. A pregnant woman with low counts is also assessed differently.
What to ask at CION
Ask which grade you are in, and which of the counts put you there. Ask whether any test result is still awaited. At CION, the haematology team reviews the reports, presents the case to a tumour board and helps coordinate transplant assessment with qualified centres where that is needed.
Questions we are asked
Common questions about severe aplastic anaemia
Can the grade change after diagnosis?
Yes. Non-severe disease can become severe if the counts keep falling, and counts can improve after treatment. The label given at diagnosis is mainly used to choose the first treatment. Your team will keep checking your counts, and they will tell you if the picture has changed enough to alter the plan.
My platelets are very low but my neutrophils are fine. Is it severe?
Not on counts alone. Severe disease needs at least two of the three counts below the set levels, along with the marrow finding. One very low count still matters, especially for bleeding risk, so do not dismiss it. Ask your haematologist which counts they are watching most closely and why.
Why do I need a bone marrow biopsy if the blood test is clear enough?
Blood counts show that the marrow is not making enough cells. They cannot show why. The biopsy shows whether the marrow is empty or full of abnormal cells, which points to a completely different illness. The grade cannot be given without it, and treatment choices depend on it.
Does very severe mean nothing can be done?
No. It means the infection risk is high and treatment needs planning without delay. People in this grade are offered the same kinds of treatment as in the severe grade. What it does mean is that fevers must be taken to an emergency department at once, not watched at home.
Why did two laboratories give slightly different numbers?
Machines, methods and reporting units differ between laboratories, and counts also shift from day to day. A small difference is common and rarely changes the grade. Keep copies of every report in date order and bring them all, so your haematologist can read the trend rather than a single result.
Can a child have severe aplastic anaemia?
Yes. The same grading is used in children, but doctors look harder for inherited causes before settling on the diagnosis, because that changes the treatment and the family testing. A child with low counts should be seen by a haematologist with experience in children's blood disorders.
Should we stop the medicines my father was already taking?
Do not stop or change any medicine on your own. Some medicines can affect the marrow, and some cannot safely be stopped suddenly. Make a full list, including tonics and herbal products, and take it to the haematologist. The treating team will decide what, if anything, needs to change.
Is treatment covered by government schemes?
Parts of the care, such as transfusions and some treatments, may be covered under Aarogyasri, PM-JAY, CGHS, ECHS, EHS or cashless insurance. What is covered changes, so check the current rules for your scheme. The CION team can help you understand what your own cover is likely to include.
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Dr. Basudev Pokhrel reviews blood counts, transfusion needs and blood disorders, and works with the CION tumour board on blood cancers.
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Sources
- British Society for Haematology — Guidelines for the diagnosis and management of adult aplastic anaemia
- NHLBI — Aplastic anaemia: diagnosis
- NHS — Aplastic anaemia
- National Health Mission — National Health Mission
This page is general information, not a prescription. Do not change or stop any treatment based on what you read here. If anything is worrying you, contact your own treating team — or call our helpline and we will help you reach the right specialist.
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