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LDH, beta-2 microglobulin and what they say about lymphoma | CION Cancer Clinics
LDH and beta-2 microglobulin are blood tests that rise when lymphoma is active or bulky. A raised LDH is one of five factors in the International Prognostic Index for large B-cell lymphoma. Neither test diagnoses lymphoma, and both rise with other causes such as kidney problems, infection or a damaged sample. This page explains what a raised result does and does not mean. At CION Cancer Clinics, our haematology team plans myeloma and lymphoma care with you, discussed at a tumour board and explained in plain words.
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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
- Why are LDH and beta-2 microglobulin checked in lymphoma?
- What do the words next to the result mean?
- What else can raise LDH or beta-2 microglobulin?
- How do these tests feed into prognosis?
- What usually happens after a raised result?
- What do families often believe about these results?
- What can these blood tests not tell you?
- Common questions about LDH and beta-2 microglobulin
The short answer
Why are LDH and beta-2 microglobulin checked in lymphoma?
LDH and beta-2 microglobulin are blood tests that rise when there is a lot of lymphoma activity in the body. A raised LDH is one of the factors doctors use to judge the outlook in many lymphomas. Neither test diagnoses lymphoma, and a raised result does not tell you how you will do on its own.
What LDH is
LDH, short for lactate dehydrogenase, is an enzyme found inside almost every cell. When cells grow fast or break down, more of it spills into the blood. Lymphoma that is large or fast-growing often pushes LDH up. So do many conditions that have nothing to do with cancer.
What beta-2 microglobulin is
Beta-2 microglobulin, often written B2M, is a small protein on the surface of most cells, and lymphocytes shed a lot of it. It tends to be higher when there is more lymphoma or leukaemia in the body. Because the kidneys clear it, weak kidneys also raise it.
Both are ordinary blood tests. They need no fasting unless your doctor asks for other tests at the same time.On your report
What do the words next to the result mean?
- Reference range
- The range the laboratory treats as usual. It differs between laboratories, so compare your result with the range printed beside it.
- Upper limit of normal
- The top of that range. Reports and doctors often describe LDH as "above the upper limit of normal" rather than giving a fixed cut-off.
- H or a flag
- The result is above the laboratory's range. It says nothing about why.
- Haemolysed sample
- Red cells broke open in the tube after the blood was drawn. This can push LDH up falsely, and the test is usually repeated.
- Prognostic index
- A scoring system that combines several findings to describe risk groups. LDH or B2M is part of several of them.
Not sure whether this applies to you?
Ask an oncologistNot always lymphoma
What else can raise LDH or beta-2 microglobulin?
A raised result is read against your whole picture. These are common reasons it can be high without saying anything about the lymphoma.
Red cells breaking down
When red cells break down inside the body, or in the tube after the sample is taken, LDH rises. A haemolysed sample is one of the most common reasons for a surprising result.
Liver, heart and muscle
Liver inflammation, a recent heart problem and hard exercise or muscle injury can all push LDH up.
Tell the team about
- Heavy exercise before the test
- Recent injury or surgery
The kidneys
Beta-2 microglobulin is cleared through the kidneys. When kidney function is reduced, it builds up in the blood even when the lymphoma is small.
Infection and inflammation
Viral infections and long-standing inflammatory conditions can raise both tests. A result taken during a fever may be repeated once you are well.
Reading the outlook
How do these tests feed into prognosis?
Prognosis means the likely course of the illness. In lymphoma, doctors estimate it by combining several findings into an index, and LDH appears in many of them. No single blood test sets the outlook.
In diffuse large B-cell lymphoma
The International Prognostic Index, called IPI, counts five factors: age over 60, stage III or IV, a raised LDH, more than one site outside the lymph nodes, and how much the illness limits daily life. Each factor present adds to the score.
In other lymphomas and related diseases
Follicular lymphoma and mantle cell lymphoma have their own indices, and LDH or beta-2 microglobulin appears in several of them. Beta-2 microglobulin carries particular weight in chronic lymphocytic leukaemia and in myeloma, a related blood cancer.
What an index is used for
An index describes risk groups drawn from large studies. It helps your haematologist choose how intensive treatment should be. It does not describe what will happen to one person, and many people in higher-risk groups respond very well.
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If the result is high
What usually happens after a raised result?
Check the sample
If LDH is unexpectedly high, the team first asks whether the sample was haemolysed or delayed. A repeat test often settles this quickly.
Look for other causes
Kidney and liver tests, recent infection, exercise and other medicines are checked. Beta-2 microglobulin is always read beside kidney function.
Read it with the staging
The result is combined with the biopsy, PET-CT and your symptoms. At CION, the haematology team presents the full picture at a tumour board before the plan is agreed.
Track it over time
A raised LDH that falls during treatment is a useful sign, though the scans carry more weight. A new rise later is looked into, not ignored and not assumed to be relapse.
Commonly believed
What do families often believe about these results?
"A high LDH means the lymphoma has spread everywhere."
LDH reflects how much cell activity there is, not where it is. Stage comes from scans. A high LDH can sit with limited stage disease, and a normal LDH with advanced stage.
"A normal LDH means there is no lymphoma."
Many people with lymphoma, especially slow-growing types, have a normal LDH. It cannot rule lymphoma in or out. Only a biopsy can diagnose it.
"We should test LDH every week to see if treatment is working."
LDH moves for many reasons, including treatment itself and infections. Frequent testing mostly causes worry. Your team decides when a repeat is useful.
"A high beta-2 microglobulin means the treatment will not work."
It places some people in a higher-risk group, which may shape the plan. It does not decide whether treatment works for you.
Being straight with you
What can these blood tests not tell you?
They cannot tell you what type of lymphoma you have, how far it has spread or how long you will live. This page gives no cut-off numbers, because ranges differ between laboratories and a single result is always read with your symptoms, scans and repeat tests.
What to ask at your appointment
Ask whether your result is raised compared with that laboratory's range. Ask whether kidney function or the sample could explain it. Ask whether it changes your risk group or treatment, and when it will next be checked.
Bring every earlier blood report you have. A trend is far more useful than one number.Questions we are asked
Common questions about LDH and beta-2 microglobulin
My father's LDH is high. Does he have lymphoma?
Not necessarily. LDH rises with many conditions, including liver problems, muscle injury, infection and a sample damaged in the tube. A raised LDH on its own is a reason to look further, not a diagnosis. If he has swollen glands, fevers or weight loss, see a doctor who can arrange the right tests.
Is a very high LDH an emergency?
The number alone usually is not. But a very high LDH with a fast-growing lymphoma can come with rapid cell breakdown, which strains the kidneys. If the person is passing much less urine, is confused, or has a racing heartbeat, go to the nearest emergency department or call 108.
Should LDH come down during treatment?
If it was raised because of the lymphoma, it often falls as treatment works. It can also rise briefly early on, as lymphoma cells break down. Your team reads it alongside scans and how you feel, so a single change is not a verdict on the treatment.
Why was beta-2 microglobulin ordered with kidney tests?
Because the kidneys clear beta-2 microglobulin from the blood. If kidney function is reduced, the level rises for that reason alone. Reading them together tells your doctor how much of the result is likely to come from the lymphoma.
Can diet or medicines lower LDH?
No food or supplement is known to lower LDH in a way that helps lymphoma. The level reflects what is happening in the body, so lowering the number would not change the illness. Do not start any remedy without telling your haematologist first.
Do these tests need to be repeated after treatment?
Often, yes, as part of routine follow-up with other blood tests. A new rise is one of several things that may prompt an earlier review or scan. It does not by itself mean the lymphoma is back, because the same causes that raised it before can raise it again.
Our report does not include beta-2 microglobulin. Is that a gap?
Not always. LDH is checked in almost every lymphoma, but beta-2 microglobulin is more useful in some types than others. Your haematologist orders it when it will help place you in a risk group or guide the plan. Ask if you are unsure.
Who should explain these results to us?
A haematologist who has your biopsy report, scans and earlier blood tests in hand. At CION, Dr. Basudev Pokhrel and the haematology team read these results together and explain what they mean for the plan. Bring the family member who will help with decisions.
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Sources
- National Cancer Institute — Adult Non-Hodgkin Lymphoma Treatment (PDQ)
- National Cancer Institute — Tumor Markers
- American Cancer Society — Non-Hodgkin Lymphoma
- 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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Share the report with us. CION's haematology team will read it with your other tests and explain what it means.