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MRD in childhood leukaemia, explained for parents | CION Cancer Clinics
MRD, or minimal residual disease, is the very small number of leukaemia cells left after treatment, too few to see under a microscope. Special tests on bone marrow count them. The result, especially at the end of the first phase, helps decide how strong the rest of treatment should be. This page explains what positive and negative results mean, and what they cannot tell you. At CION Cancer Clinics, our haematology team supports patients and families through treatment, cost questions and life at home.
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Medically reviewed by Dr. Basudev PokhrelConsultant Haematologist · last reviewed September 2026, next review due September 2027
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On this page
- What does MRD mean in childhood leukaemia?
- How is MRD measured?
- When is MRD tested during treatment?
- What do the words on an MRD report mean?
- What happens if my child's MRD result is positive?
- What do parents often misunderstand about MRD?
- What can this page not tell you about your child?
- Common questions about MRD in childhood leukaemia
The short answer
What does MRD mean in childhood leukaemia?
MRD stands for minimal residual disease. It is the very small number of leukaemia cells still left in your child's body after treatment, too few to see under an ordinary microscope. Special laboratory tests can find and count them.
Why doctors measure it
After the first phase of treatment, most children look well and their blood counts often recover. A standard marrow test may show no leukaemia at all. MRD testing looks much deeper. It tells the team how much leukaemia is really left, and how fast it is clearing.
What the result is used for
MRD is one of the strongest guides to how much more treatment your child needs. A very low result usually supports the planned treatment. A higher result usually means stronger treatment is added. It helps the team give enough treatment without giving more than your child needs.
MRD is one result among several. The team reads it with the genetic tests, the blood counts and how your child is doing.The tests
How is MRD measured?
All of them look for leukaemia cells hidden among many healthy cells. They differ in how they spot those cells.
The sample
MRD is usually checked on bone marrow, taken with a needle from the back of the hip bone. Children are normally given sedation or a general anaesthetic for this. Some protocols also test blood.
Flow cytometry
A machine reads markers on the surface of thousands of cells, one by one. Leukaemia cells carry a pattern of markers that healthy cells do not. The pattern found at diagnosis helps the laboratory find them later.
PCR
This test looks for a piece of genetic code that belongs only to your child's leukaemia. It can find very small amounts, but it needs a sample from diagnosis to set up the test.
Next-generation sequencing
A newer genetic test that reads the same kind of leukaemia code in great depth. It is not offered everywhere.
Many centres send MRD samples to a specialist laboratory. Ask which test was used, because results from different tests are not always directly comparable.Not sure whether this applies to you?
Ask an oncologistThe timing
When is MRD tested during treatment?
-
At diagnosis
The first marrow test records what the leukaemia looks like. This gives the laboratory the pattern or genetic code to search for later.
-
Part way through induction
Induction is the first phase of treatment. Some protocols check early to see how quickly the leukaemia is falling.
-
End of induction
This is the result most families hear about. It often confirms or changes your child's risk group, the label that sets how strong the next phases will be.
-
After consolidation, in some protocols
If MRD was still found, it is often measured again after the next phase. The plan is adjusted to that result.
-
Later, if there is a concern
MRD may be checked again if counts change, or before decisions such as a transplant.
On your report
What do the words on an MRD report mean?
- MRD negative or undetectable
- The test did not find leukaemia cells down to the level it can measure. It does not prove every cell is gone.
- MRD positive or detectable
- Some leukaemia cells were found. The amount matters more than the word.
- 0.01%
- A level many protocols use as a dividing line: about one leukaemia cell among ten thousand cells. Laboratories and protocols set their own cut-offs.
- Sensitivity
- The smallest amount of leukaemia a test can find. A more sensitive test can find fewer cells.
- Remission
- No leukaemia seen with a standard microscope, and blood counts recovering. A child can be in remission and still be MRD positive.
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If MRD is found
What happens if my child's MRD result is positive?
Usually the treatment becomes stronger, not shorter or stopped. A positive result tells the team the leukaemia needs more treatment to clear. It does not mean treatment has failed.
What may change
Your child may move to a higher risk group. That can mean more medicines in the middle phases, more hospital days and closer checks. The overall shape stays the same: induction, consolidation, then a long maintenance phase at home.
Newer options and transplant
For some children whose MRD stays high, the team may discuss newer immune treatments or a stem cell transplant. These are considered for a small group, not for most children. CION does not carry out transplants or CAR-T. The haematology team reviews the case, presents it at a tumour board and helps you reach a qualified centre if either is advised.
Who a lighter plan does not suit
If MRD is positive, asking for less treatment raises the chance of the leukaemia coming back. Tell the team your worries. Let them set the intensity.
Commonly believed
What do parents often misunderstand about MRD?
"MRD negative means the leukaemia is gone and we can
stop."
A negative result is good news, but a few cells can still hide below what the test can find. That is why the full treatment, including the long maintenance phase, still matters. Never stop tablets on your own.
"MRD positive means our child will not get
better."
A positive result means more treatment is needed. It does not tell you how your child's story ends. Ask your haematologist what the result means for your child, not for children in general.
"The blood counts are normal, so the marrow test is
not needed."
Normal counts can sit alongside leukaemia cells in the marrow. The marrow test is what shows the team whether the plan is working. Missing it can mean the wrong plan.
"Another hospital gave a different number, so one
must be wrong."
Different tests and laboratories measure in different ways. Bring both reports and ask which test each used before drawing conclusions.
Being straight with you
What can this page not tell you about your child?
This page cannot read your child's MRD result or tell you the outlook. That depends on the test used, the protocol, the genetic results and how your child responds over the coming months.
Questions worth asking the team
Which test measured the MRD, and on marrow or blood? What was the level, and what cut-off does your protocol use? Has the risk group changed? When will MRD be checked again? Write the answers down.
Getting a second look
If your child is being treated elsewhere, bring every report, including flow cytometry and genetic results. The CION haematology team can go through them with you.
Questions we are asked
Common questions about MRD in childhood leukaemia
Is MRD the same as remission?
No. Remission means no leukaemia is seen with a standard microscope and the blood counts are recovering. MRD looks far deeper. A child can be in remission and still have leukaemia cells that only an MRD test can find. That is why the team checks both.
Does the MRD test hurt my child?
It uses the same bone marrow test your child may already have had. Most children are given sedation or a general anaesthetic, so they sleep through it. The hip may feel sore or bruised for a day or two. Tell the team if your child is very frightened, because they can help prepare them.
How long does the MRD result take?
It depends on the test and where the sample is sent. Flow cytometry results often come back within days. Genetic tests may take longer. Treatment usually carries on while you wait. Ask the team when to expect the result and who will explain it to you.
Does MRD matter in AML as well as ALL?
Yes. MRD is also measured in childhood AML, another type of leukaemia, and it helps guide treatment there too. The tests, timing and cut-offs are different from ALL. Ask your child's team how MRD is used in their own protocol rather than comparing with an ALL plan.
Can MRD go from positive to negative?
Often, yes. Many children who are MRD positive at the end of induction become negative after the next phase of treatment. That is why the test is repeated in some protocols. A later negative result is taken into account when planning what comes next.
Will MRD be checked after treatment ends?
Not usually as a routine. After treatment, your child has regular clinic visits and blood counts. If something changes, the team may repeat a marrow test and check MRD then. Keep every follow-up visit, even when your child seems completely well.
Should we ask for a lighter plan if MRD is negative?
Some protocols already lighten certain phases for children with a very good response. That decision belongs to the team and the protocol. Share your worries about side effects, school or money, but do not cut treatment on your own, because that raises the chance of the leukaemia coming back.
Is MRD testing covered by schemes or insurance?
It may be, when it is part of an approved treatment plan. Aarogyasri, PM-JAY, CGHS, ECHS, EHS and cashless insurance each have their own rules, and these change. Check the current terms, and ask the team for an estimate if the sample is sent to an outside laboratory.
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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
- National Cancer Institute — Childhood Acute Lymphoblastic Leukemia Treatment (PDQ) - Patient Version
- National Cancer Institute — Childhood Acute Lymphoblastic Leukemia Treatment (PDQ) - Health Professional Version
- National Cancer Institute — Definition of minimal residual disease
- American Cancer Society — Leukemia in Children
- Leukemia & Lymphoma Society — Acute Lymphoblastic Leukemia (ALL)
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.
Keep reading
Related pages
Childhood ALL guideThe full picture of childhood ALL, from diagnosis to follow-upRisk Groups in Childhood ALLHow the MRD result confirms or changes the risk groupALL Treatment Phases in ChildrenWhere induction and consolidation fit in the planRelapsed Childhood LeukaemiaWhat happens if leukaemia returns after treatmentPaediatric Blood CancersEvery guide for parents of a child with a blood cancer
Talk to us
Have an MRD result you do not understand?
Bring or send every report. The CION haematology team will go through the results with you and explain what they mean for the plan. One helpline serves every CION centre.