Condition Guide

Aplastic Anaemia

Name: Aplastic Anaemia: Blood Tests, Causes & Treatment
Creator: Suman Konda
Published: 2026-07-05

Aplastic anaemia is a rare but serious condition where the bone marrow stops making enough blood cells. A bone marrow biopsy alongside blood tests confirms the diagnosis.

Written by Suman Konda, Clinical Pharmacist · Based on peer-reviewed sources · Editorial policy · Not medical advice

Last reviewed and updated: 28 September 2026 · How we check our content

What is aplastic anaemia?

Aplastic anaemia is a rare but serious condition in which the bone marrow's blood-forming stem cells are destroyed, usually by an autoimmune T-cell attack. The result is pancytopenia: low red blood cells (anaemia), low white blood cells (neutropenia, with risk of serious infections) and low platelets (thrombocytopenia, with risk of bleeding). Without treatment, severe aplastic anaemia is life-threatening.

Causes include autoimmune destruction (most common acquired cause), viral infections such as EBV and seronegative hepatitis, toxic exposures including benzene and radiation, certain drugs, and rarely inherited marrow failure syndromes such as Fanconi anaemia, which need excluding in younger patients.¹

Aplastic anaemia: myths vs facts

Marrow failure is widely misunderstood. Here is what the evidence says:

MYTH It is just a severe form of iron-deficiency anaemia.

FACT Most anaemias affect red cells alone. Aplastic anaemia is failure of the marrow itself, so all three cell lines fall together. A low haemoglobin with normal white cells and platelets is not aplastic anaemia and points elsewhere.

MYTH Blood counts alone can confirm the diagnosis.

FACT Blood counts show pancytopenia but cannot show why. A bone marrow biopsy is essential: it distinguishes an empty, hypocellular marrow from marrow crowded out by leukaemia, lymphoma, myeloma or metastatic cancer, and from myelodysplastic syndrome, which can look similar on blood counts but is treated quite differently.³

MYTH A low reticulocyte count means the marrow is working hard.

FACT The opposite. In most anaemias the marrow responds by producing more young red cells, so reticulocytes rise. In marrow failure they are inappropriately low — one of the earliest clues that the problem is failed production rather than loss or destruction.

MYTH If immunosuppression has not worked by 3 months, it has failed.

FACT The standard non-transplant regimen (antithymocyte globulin + ciclosporin + eltrombopag) is assessed over at least six months. A 2026 analysis found haematological response in 52.6% of patients at 12 weeks, rising to 67.9% at 26 weeks — patients who appear not to respond at three months can still recover later.²

MYTH A stem cell transplant is the only real treatment.

FACT Transplant can cure severe aplastic anaemia in patients under 40 with a matched sibling donor, but immunosuppressive therapy is effective for those without a donor or older patients, with supportive care — transfusions, infection control — carrying much of the load while treatment takes effect.

What to do next

Pancytopenia needs a haematologist, not watchful waiting. Match your situation to the next step:

Situation	Sensible next step	When to seek urgent care
Routine blood test shows low red cells, white cells and platelets together	Ask for an urgent haematology referral; a bone marrow biopsy is the next diagnostic step.	If counts are very low or you have fever, bleeding or severe fatigue — go promptly.
Fever while neutrophils are very low	Medical emergency: fever with severe neutropenia needs immediate antibiotics, not watchful waiting.⁴
Bruising or bleeding with low platelets	Avoid intramuscular injections, contact sports, aspirin and NSAIDs while platelets are low.	Seek urgent care for nosebleeds that will not stop, blood in urine or stool, or severe headache.
On immunosuppressive therapy, no improvement at 3 months	Continue as advised — response is formally assessed at about 6 months, and late responses are common.	Report new fever, bleeding or signs of infection immediately during treatment.
Young patient with suspected inherited cause	Ask whether Fanconi anaemia or dyskeratosis congenita testing is indicated.	—

Blood test findings in aplastic anaemia

The severity thresholds that define the disease:

Test	Finding	Severity threshold
Haemoglobin	Low	<8 g/dL = severe
Neutrophils (ANC)	Very low	<500/µL = severe; <200/µL = very severe
Platelets	Very low	<20,000/µL = severe
Reticulocyte count	Very low	<1% = hypoproliferative bone marrow
Bone marrow biopsy	Hypocellular: mostly fat cells	Confirms diagnosis

Low reticulocytes are the early clue that the problem is failed production rather than loss or destruction, and the biopsy is what separates marrow failure from leukaemia, lymphoma and MDS.

Treatment options

Treatment	For whom
Allogeneic bone marrow transplant	Severe aplastic anaemia in patients under 40 with a matched sibling donor: potential cure
Immunosuppression (ATG + ciclosporin)	Severe disease without a matched donor, or older patients
Eltrombopag (TPO receptor agonist)	Added to immunosuppression to boost marrow recovery
Supportive care	Blood and platelet transfusions, antibiotics for infections — carries much of the load early on

The standard non-transplant regimen has evolved from dual immunosuppression to a triple regimen adding eltrombopag, which stimulates residual marrow stem cells to proliferate while the immunosuppressive component restrains the T-cell attack. Patients who do not respond to first-line immunosuppression may proceed to a second course of ATG or an unrelated-donor transplant — decisions for a specialist centre, not a GP surgery. Discuss every option with your haematologist.

Practical notes

With aplastic anaemia, every blood count matters, so keep all your reports in date order — haemoglobin, neutrophils and platelets together. Noting down any episodes of unusual bleeding, bruising or fever alongside the dates helps your haematologist see patterns and judge how the condition is behaving between visits.

Your doctor will want a complete picture: every medicine and supplement you take (some drugs are known triggers), any recent viral illnesses, exposure to chemicals, solvents or radiation, and family history of blood disorders. Bring this list to each appointment rather than relying on memory.

Day-to-day life usually involves precautions your haematologist will spell out: what level of fever should be reported promptly, which activities to avoid when platelets are low, and which vaccinations are safe and when. Travel plans, dental work and even routine procedures are worth discussing in advance rather than assuming they are fine.

Follow-up is typically frequent, especially when treatment changes — blood counts may be checked weekly or even more often at first, then spaced out as things stabilise. Transfusion thresholds and treatment adjustments are decisions for your haematologist; the most useful thing you can do is keep appointments and report new symptoms promptly.

In India

In India, a complete blood count typically costs around ₹250–₹600 at private labs, though prices vary by city and lab. A full diagnostic workup for aplastic anaemia, including bone marrow biopsy and related tests, runs into several thousand rupees, and treatment costs vary widely — discuss estimates openly with your treating hospital.

Bone marrow evaluation should ideally be done at a centre experienced in blood disorders, and choosing a NABL-accredited lab for the blood work is sensible. Home sample collection is available in major cities for routine counts. As always, the reference range printed on your own report is the one that counts.

Frequently asked questions

What makes aplastic anaemia different from other anaemias?

In aplastic anaemia the bone marrow fails to produce enough of all blood cells — red cells, white cells and platelets — unlike iron-deficiency anaemia, which affects red cells due to low iron. That pancytopenia is the defining feature.

What are the main symptoms?

Because all blood cell lines fall, symptoms include fatigue and pallor (low red cells), frequent infections (low white cells), and easy bruising or bleeding (low platelets).

How is aplastic anaemia diagnosed?

A full blood count showing low counts across all cell types (pancytopenia) prompts a bone marrow biopsy, which confirms the reduced marrow activity characteristic of the condition.

How often will I need blood tests?

It depends on your counts and your treatment stage — testing is often frequent at first, sometimes weekly, and spaced out once things are stable. Your haematologist sets the schedule, and it may change if treatment changes. Keep every appointment even when you feel well, since counts can fall silently.

Can aplastic anaemia turn into something else over time?

A small proportion of people with aplastic anaemia later develop related bone marrow disorders, which is one reason long-term follow-up matters. This is about monitoring, not prediction — your haematologist watches for changes precisely so anything new is caught early. Discuss any worries about this at your appointments.

Should my family members be tested too?

Most aplastic anaemia is acquired rather than inherited, so family testing is not usually needed. In the less common inherited marrow failure syndromes, family screening may be discussed. Your haematologist can tell you whether your particular situation calls for it.

What should I tell other doctors, like my dentist, about my condition?

Tell every clinician you see — dentists, surgeons, even your GP — that you have aplastic anaemia and share your latest counts if you have them. Low platelets and low neutrophils change how procedures and infections are handled. When in doubt, ask your haematologist before any invasive procedure.

References

The clinical information on this page is drawn from peer-reviewed sources indexed by the US National Library of Medicine. Links go to the source so you can read it yourself.

Aplastic Anemia. In: StatPearls. Treasure Island (FL): StatPearls Publishing. NCBI Bookshelf NBK534212
Nakamura F, Ishiyama K, Suzuki R, et al. Phase II study of the triple combination of rabbit ATG, ciclosporin and eltrombopag in patients with transfusion-dependent aplastic anaemia: West Japan Hematology Study Group (W-JHS) AA02 trial. Br J Haematol. 2026;208(3):1084–1092. PMID 41485764
Peslak SA, Olson T, Babushok DV. Diagnosis and Treatment of Aplastic Anemia. Curr Treat Options Oncol. 2017;18(12):70. PMID 29143887 · doi:10.1007/s11864-017-0511-z
Young NS. Aplastic Anemia. N Engl J Med. 2018;379(17):1643–1656. PMID 30354958 · doi:10.1056/NEJMra1413485

Medical Disclaimer: For educational purposes only. Always consult a qualified healthcare professional for diagnosis and treatment.