Diagnosis Of Multiple Myeloma
A thorough clinical evaluation is required for the effective diagnosis of multiple myeloma. Based on the early signs and symptoms of the disease, your doctor will ask you to get a physical examination, followed by some laboratory tests, imaging tests and if needed, a biopsy as well. Here are the tests that will be a part of a comprehensive diagnosis of multiple myeloma.
Physical examination
When you experience the early signs and symptoms, book an appointment with your physician at the earliest. Your doctor may ask you questions and enquire about your medical history. Based on the answers, he may suggest some of the following clinical tests to confirm the presence of the disease:
A. Blood tests
1. Complete blood count (CBC)
CBC measures several components of the blood, including red blood cells, white blood cells, platelets and others. The following levels are checked while studying the results of a CBC.
- A decreased level of hemoglobin (anemia)
- A decreased platelet count (thrombocytopenia) that can cause bleeding problems
- A decreased level of white blood cells (granulocytopenia) which causes a weakened immune system.
2. Blood urea nitrogen (BUN)
Urea nitrogen is the waste product formed by the body after consumption of food. The liver breaks down the protein in the food and produces urea nitrogen which is released into the blood and eventually ends up in the kidneys. When the kidneys are healthy, they effectively remove the blood urea nitrogen; however unhealthy kidneys are unable to do so and leave more of it in the blood. Therefore, BUN test helps to see how much of the waste product remains in the blood and helps to detect the health of the kidneys.
Laboratory based blood chemistry tests will help to check for the levels of blood creatinine, albumin, calcium, and other electrolytes.
3. Creatinine laboratory test
The creatinine test helps to measure how efficiently the kidneys are able to remove the waste from blood. Creatinine is a natural waste product which is present in the blood and urine. Kidneys remove creatinine from the body by filtering it from the blood and then releasing it into the urine. This test measures the amount of creatinine in the blood.
High creatinine levels mean that the kidneys are not functioning well and are common in people with myeloma.
4. Albumin test
Albumin is a protein produced by the liver and its function is to carry nutrients and prevent body fluids from leaking into the body. A serum albumin test checks the amount of albumin in the body. Any abnormality in the level of albumin indicates a likelihood of liver disease, kidney disease or nutritional deficiency. Low levels can be seen in myeloma.
5. Calcium test
Calcium is a mineral found in the body responsible for many vital functions like maintaining bones strength, muscles, nerves function, and blood clotting. Abnormal levels of calcium can lead to several complications in the body like kidney disease, bone disease, and multiple organ tumors.
Calcium levels may be high in people with advanced myeloma and cause symptoms of fatigue, weakness, and confusion.
6. Lactate dehydrogenase test
Serum lactate dehydrogenase (LDH) test measures the levels of the enzyme lactate dehydrogenase in the blood. This enzyme is majorly involved in energy production and is found in nearly all of the body’s cells, with the highest levels in the cells of the heart, liver, muscles and kidneys. It is released in the bloodstream as a result of damage to the tissues following an injury.
A blood test to measure lactic dehydrogenase (LDH) levels can be a useful indicator of a patient’s prognosis as high levels can indicate cancer recurrence.
7. Quantitative immunoglobulins
This test helps to measure the levels of different immunoglobulins present in the blood such as IgA, IgD, IgE, IgG, and IgM. The quantitative analysis of these immunoglobulins helps to see if they are abnormal, suggesting the presence of disease or infection. In multiple myeloma, their levels usually differ from what their normal ranges usually are.
B. Urine test
Urine tests can be used to:
- Measure the amount of protein in the urine
- Presence of free light chains
- Test for creatinine, a waste product excreted by the kidneys
- Presence of bilirubin, a breakdown product of hemoglobin
You might most likely be asked to give a sample of urine that has been collected over a 24-hour period, so it can measure how much myeloma protein is present.
Urine protein electrophoresis (UPE or UPEP) and urine immunofixation may be done to look for free light chains in the urine and to assess kidney function.
It is a medical procedure used as a diagnostic method in which a piece of the tissue or a sample of the cells is removed from the body and is tested in a laboratory. Multiple myeloma is characterized by an increased number of plasma cells in the bone marrow and therefore a bone marrow biopsy can help. It can be done at the doctor’s office or at the hospital.
1. Bone marrow aspiration
Bone marrow aspiration can be performed by numbing the back of the pelvic bone with local anesthesia. A needle is inserted into the bone and a syringe is used to remove a small amount of the liquid bone marrow. The bone marrow tissue is examined to check for the appearance, size, arrangement and shape of the cells and determine the presence of myeloma cells in the bone marrow.
The liquid part of the bone marrow called the aspirate can also be sent for other tests such as immunohistochemistry and flow cytometry, and chromosome analyses, including karyotype and fluorescent in situ hybridization (also known as FISH).
2. Immunohistochemistry
It is a laboratory method that uses antibodies to check for the presence of certain antigens (markers) in the tissue sample. The sample is treated with special proteins that cause color change and help to identify myeloma cells.
3. Flow cytometery
It is a technology that helps to analyze single cells or particles as they flow past multiple lasers while being suspended in a buffered salt based solution. The sample cells are treated with special proteins that stick only to certain cells. This in turn helps to identify if the cells are abnormal or cancerous cells.
D. Imaging tests
Along with the other chemical analysis and physical examination, the doctor may also recommend you to get a few imaging tests done. It will help provide a clear visual of the concerned/ affected organ or tissue.
1. X-rays scan
Multiple myeloma can cause tissue damage at the site of disease initiation. An X-ray produces images of the organs and confirms the presence of any tissue damage. It can be done to see if there is a suspicious area that might be cancer, or understand the spread of the cancer.
2. Magnetic resonance imaging (MRI)
It is an imaging test that uses a magnetic field to take pictures of organs and structures inside the human body. An MRI can help understand the initiation and spread of the disease.
3. CT scan
A CT scan, also known as computed tomography, is a machine that takes a series of x-rays to make a picture with minute details. The scan helps to image bones, blood vessels and soft tissues from different angles. It can also be used to guide a biopsy needle into an area of concern.
If your doctor diagnoses you with multiple myeloma, the doctor will then use the information gathered to classify the disease into the respective stages - stage I, II, III or IV.