Waldenstrom’s macroglobulinaemia (WM) is diagnosed through a series of tests. Here, we break down what these tests are and what you can expect.

There are three main types of test routinely used to diagnose WM: blood tests, a bone marrow biopsy, and scans. You may have been referred for these tests following a visit to your GP with concerning symptoms. However, around a quarter of people with WM are diagnosed ‘by chance’ after routine blood tests or during investigation for another unrelated condition.

Scroll down to find more information on:

  • Blood tests
  • Bone marrow biopsies
  • CT scans
  • PET scans

Blood tests

For a blood test, a small sample of your blood is taken. This is sent away to be tested in a laboratory.

You can’t be diagnosed with WM from blood tests alone, but they are often the first marker that there might be a problem and will prompt your doctors to investigate further.

What are they looking for?

There are lots of different types of blood tests, and what you’re tested for will depend on the symptoms you have and the results of previous tests. The most common blood test is called the Full Blood Count.

A Full Blood Count (FBC) measures the levels of red cells, white cells and platelets in your blood. The blood ‘count’ refers to the amount of each type of blood cells. WM can cause low levels in these ‘counts’, which can cause symptoms you may have been experiencing, for example a low red blood count can cause symptoms of anaemia.

Other blood tests that help doctors diagnose and monitor WM are:

• Serum immunoglobulin which measures the level of antibodies in your blood. People with WM have high levels of an antibody called IgM

• Plasma viscosity which measures how viscous (or thick) your blood is. High levels of IgM can cause the blood to become thicker

• Beta-2 microglobulin measures a protein called beta-2 microglobulin, which can let doctors know how severe the disease it. Higher levels of beta-2 can mean a more severe disease.

After diagnosis, blood samples are taken and tested regularly to monitor your symptoms and, alongside these symptoms, can help your doctors understand when you might need treatment.

What happens in a blood test?

There normally isn’t anything you need to do before to prepare for a blood test. If you do need to prepare, your doctor or nurse will let you know. It’s important to let the team know of any medications (prescribed and over-the-counter) you take beforehand.

The doctor, nurse or phlebotomist (a person who is trained to take blood) will clean your skin where the blood will be taken from (usually in the upper arm at the bend of your elbow, where the vein is visible through the skin). They’ll wrap a band tightly about your upper arm to make the vein swell. They’ll insert a needle into your vein to take the blood samples – this might sting a little bit. If you are in pain, tell the person taking your blood.

The blood is collected in tubes – the number depends on what tests have been ordered (usually 2-3). Don’t worry, it might look like a lot, but the samples of blood are only small. Once they’re finished, they’ll remove the band from your arm and take the needle out. They’ll tape a plaster or small dressing over where the needle went in, and you’ll be able to remove this in a few hours.

Some people feel dizzy or nauseous when they have blood tests done. If you know you often feel like this, it’s worth seeing whether someone can come with you to the test, to care for you afterwards. If you come over ill during or after your test, sit down and tell your doctor or nurse who will be able to help.

Bone marrow biopsy

Bone marrow is the spongy tissue found in the middle of the bigger bones in your body. This is where blood cells are made.

A bone marrow biopsy is a procedure where a small sample of your bone marrow is taken for testing, to check for abnormal cells. This test is the only one that can diagnose Waldenstrom’s macroglobulinaemia, because WM is a cancer of the bone marrow.

What are they looking for?

The sample from your bone marrow will be sent to a haematopathologist, who is an expert in examining blood and bone marrow samples. They will look for the abnormal white blood cells that cause WM – the lymphoplasmacytic lymphoma cells (LPL cells).

What happens during a bone marrow biopsy?

A bone marrow biopsy takes around twenty minutes, and most people will go to hospital for the procedure and come out on the same day.

Your medical team should give you information about the procedure before you have the biopsy. This should include information about any medication you might need to stop or take (such as blood thinners), and any other preparations. Remember to tell them about any medication or supplements you’re taking before the procedure, in case these change how you need to prepare.

A bone marrow biopsy is usually taken from the back of your hip bone (pelvis). Your doctor or nurse will help you into position beforehand, and make sure that you are comfortable as you’ll need to stay as still as possible for the procedure.

The skin where your biopsy will be taken is cleaned and then the doctor or nurse will inject local anaesthetic into the area. You might feel a sting from the needle, but after a short while the area will go numb.

The cells from your bone marrow are taken through a needle. When the area is numb, the doctor or nurse will put the needle into your bone. They may do this by a manual needle or they may use a battery powered needle that looks like a small drill. Once the needle is in position, a syringe is attached.

The doctor or nurse uses the syringe to pull out a small sample of your bone marrow, which is liquid, called a bone marrow ‘aspirate’. Some people feel a pulling sensation at this point, which can be uncomfortable. This feeling will quickly pass, though.

A sample of the harder bone marrow tissue, called a bone marrow ‘trephine’ is usually taken next. This will done immediately after they’ve take out the bone marrow fluid. They will rotate the needle a few times to take a sample of this harder tissue. Many people describe the sensation as a pushing one, and there may be some pain, but it is usually over very quickly.

After the procedure, your nurse or doctor will ensure that there isn’t any bleeding, before applying a small dressing to the site. You won’t need stitches.

You may experience aching and bruising around the area where the needle went in for a few days after the test.

CT scan

A computerised tomography (CT) scan uses x-rays and a computer to create detailed images of the inside of your body. You may hear them referred to as CAT scans.

What are they looking for?

Although a CT scan cannot be used to diagnose WM, doctors often use the images to see if the WM is in other parts of your body. CT scans are good at showing the internal organs and will be able to show, for example, if your lymph nodes are enlarged. This may prompt your doctor to test these further.

What happens in a CT scan?

Most people will have a CT scan in their local hospital as an outpatient.

You should be given information about your scan before your appointment, including what to wear and any other preparation you’ll need to do.

You will normally be asked to remove any metal items (for example a watch, or an underwired bra) before you go into the scan. You may be given a hospital gown to wear instead of your day clothes. You’ll be asked questions about your general health. You can also talk to the staff if you have any worries about having the scan – it’s very common for people to feel ill at ease or even fearful of having a scan and they will be able to help you with the experience.

CT scans can take between 30-60 minutes, but you should plan to be in the hospital for longer, especially if you’re having another scan at the same time.

Once you are ready to be scanned, you will have to lie down on a bed that moves slowly into the scanner. The hospital staff will leave the room and monitor you through a glass window. You’ll be able to talk to them through a two-way speaker, and you can ask for help at any time.

The scanner doesn’t cover your whole body. You’ll need to lie as still as possible. The staff may ask you to do things like hold your breath at certain times to ensure the clearest possible picture.

If you are not having any further tests, you’ll be allowed to go home straight after the scan.

PET scan

A positron emission tomography scan (PET) scan uses a harmless radioactive sugar to trace cancer cells in the body. This is done alongside a CT scan.

What are they looking for?

Some cancer cells are very active and so use up a lot of the sugar you fuel your body with. When you have a PET scan, you will be injected with a harmless radioactive form of sugar (called a radiotracer). The scan uses a camera that picks up the radiotracer in your cells, which may show your doctor where your WM is in your body.

Like a CT scan, a PET scan cannot diagnose WM by itself.

What happens at a PET scan?

Most people will have a PET scan as an outpatient at their hospital. Some smaller hospitals don’t have the facilities, so you may have to travel to a larger centre.

Before your scan, your medical team should give you information about the scan, including how you need to prepare and whether you need to fast (not eat or drink) beforehand, and what to do about any medication you take. If you have any other conditions or take medication, it’s important to speak to your medical team about this beforehand, in case they have an effect on the scan. If you are diabetic, it is important to have controlled blood sugar at the time of the scan.

You’ll be asked questions about your general health, to ensure that the radiotracer is safe for you to have. You can also talk to the staff if you have any worries about having the scan – it’s very common for people to feel ill at ease or even fearful of having a scan and they will be able to help you with the experience.

A PET scan can take between 30 and 60 minutes, but you will be in hospital much longer as the radiotracer has to be given time to take effect before you have the scan.

You will be injected with the radiotracer around an hour before your scan. For the scan itself, you’ll be asked to remove any metal items (like a watch or underwired bra) before going into the scanner itself. Just like a CT scan, you’ll need to lie on a bed that rolls into the scanner and you’ll need to lie very still for the duration. The staff will leave the room, but will be monitoring you behind a glass window and are there on the end of a two-way speaker if you become distressed or unwell.

After the scan, you might need to stay a little longer to ensure you don’t have a reaction with the radiotracer, but you should be able to leave shortly afterwards. You should limit close contact with pregnant women, babies and young children for 6 hours after your scan. This is because there will be some trace of radioactivity in your body from the radiotracer.

If you are planning to travel through an air or sea port within a few days of your scan, it might be worth getting a note from your doctor to say that you have recently had a PET scan. This is because ports have radiation alarms that can be triggered by extremely small levels of radiation.

Other content you might be interested in

WM Treatment

Understanding WM

Signs and Symptoms of WM