What to Expect During a Bone Marrow Biopsy

A bone marrow biopsy is an essential test used to check the health of your bone marrow, and it is considered the gold standard for diagnosing and monitoring multiple myeloma ^[1][2]. Many patients feel extreme anxiety about this procedure, which is completely understandable. The good news is that while the procedure can be uncomfortable, it is usually quick, and most people report that the pain is manageable and less severe than they feared. Knowing exactly what will happen step-by-step can help reduce your anxiety and help you feel more in control.

Addressing Bone Safety Concerns

Because multiple myeloma can cause bone damage, it is very common to worry that inserting a needle into the bone might crack or break it. However, the procedure is considered safe even for patients with weakened bones ^[2]. The biopsy is almost always taken from the pelvis, which is a very thick, sturdy bone ^[3]. If your doctor is concerned about severe bone damage in that area, they may use advanced imaging like a CT scan to guide the needle safely ^[4].

Preparing for the Procedure

The procedure is usually performed by a hematologist, oncologist, or a specially trained nurse practitioner or physician assistant. Before it begins, your care team will help you get into a comfortable position, usually lying on your stomach or on your side ^[5]. The medical professional will clean the skin over the back of your hip bone (called the posterior superior iliac spine), which is the safest and most standard site for taking a bone marrow sample ^[5][3].

They will then numb the area using a local anesthetic, much like the numbing medication used at the dentist. You will feel a small pinch from the needle and a brief burning sensation as the numbing medicine goes in, but the area will quickly become numb.

If you are very anxious, your doctor might offer additional ways to help you relax, such as anti-anxiety medication, laughing gas, or even IV sedation, though a local anesthetic alone is the most common approach ^[6][7]. If you choose to use sedation or anti-anxiety medication, you must arrange for someone to drive you home after the procedure.

The Two Steps of the Procedure

A bone marrow examination usually involves two parts: an aspiration (taking out liquid) and a biopsy (taking out a small piece of solid bone marrow core) ^[1]. The entire process typically takes about 10 to 15 minutes.

Step 1: Bone Marrow Aspiration

First, the doctor will insert a specialized needle through the numb skin and into the bone. Because the area is numb, you shouldn’t feel sharp pain from the needle, but you will feel pressure as the needle goes into the bone ^[8].

Once the needle is inside the marrow space, the doctor will use a syringe to pull out a small amount of liquid bone marrow. This is the part that patients often say is the most uncomfortable ^[9][10]. When the suction is applied, you will likely feel a brief, sharp pulling or aching sensation that shoots down your leg or back ^[9][8]. This sensation happens because the suction creates a sudden change in pressure inside the bone. The good news is that this pulling feeling only lasts for a few seconds.

Step 2: The Core Biopsy

After the liquid is collected, the doctor will take a small, solid piece of the spongy bone marrow ^[1]. They will use a slightly different needle to core out a tiny sample, which is often compared to the size of a small pencil lead.

During this step, you will not feel the sharp pulling sensation again. Instead, you will feel a deep, dull pressure or a pushing, twisting sensation as the needle is guided into the bone ^[8]. Some patients describe this as an intense, deep ache rather than a sharp pain ^[9]. Your doctor will let you know when they are pushing and when the needle is coming out.

Recovery and Aftercare

Once the samples are collected, the needle is removed, and a bandage is applied to the site. The medical team will ask you to lie flat on your back for about 10 to 15 minutes. This applies direct pressure to the biopsy site, which is important to stop minor bleeding and prevent a bruise or blood collection (hematoma) under the skin ^[11][9].

After you go home, you can expect some mild soreness at the biopsy site for a few days, similar to a deep bruise or the feeling you get after a hard workout. This ache is usually well-managed with over-the-counter pain relievers like acetaminophen (Tylenol). However, avoid NSAIDs like ibuprofen or aspirin, as they can interfere with blood clotting and increase your risk of bleeding at the biopsy site ^[9]. Keep the bandage clean and dry for 24 hours, and avoid strenuous exercise or heavy lifting for a day or two ^[9].

It usually takes 1 to 2 weeks for the full pathology results to come back, though your doctor might have preliminary results sooner.

When to Contact Your Doctor
While serious complications are rare, you should contact your doctor immediately if you experience:

• Bleeding that soaks through your bandage or does not stop when you apply pressure ^[12]
• Worsening or severe pain at the site ^[9]
• A fever, which could be a sign of infection
• Excessive redness, swelling, or warmth around the biopsy site