B-cell leukemia/lymphoma panel is a test that looks for certain proteins on the surface of white blood cells called B-lymphocytes. The proteins serve as markers that may be helpful in diagnosing leukemia or lymphoma.

This test may be performed:

• When other tests (such as a blood smear) indicate abnormal white blood cells
• When leukemia or lymphoma is suspected
• To determine the type of leukemia or lymphoma

A sample of white blood cells is obtained by drawing blood from a vein. Less commonly, the sample is taken from a bone marrow biopsy. The test also may be done on a lymph node biopsy when lymphoma is suspected.

Blood is typically drawn from a vein, usually from the inside of the elbow or the back of the hand. The site is cleaned with germ-killing medicine (antiseptic). The health care provider wraps an elastic band around the upper arm to apply pressure to the area and make the vein swell with blood.

Next, the health care provider gently inserts a needle into the vein. The blood collects into an airtight vial or tube attached to the needle. The elastic band is removed from your arm. Once the blood has been collected, the needle is removed, and the puncture site is covered to stop any bleeding.

In infants or young children, a sharp tool called a lancet may be used to puncture the skin and make it bleed. The blood collects into a small glass tube called a pipette, or onto a slide or test strip. A bandage may be placed over the area if there is any bleeding.

In the laboratory, the sample of white blood cells will be tested to determine the cell type and characteristics (immunophenotyping).

No special preparation is usually necessary.

When the needle is inserted to draw blood, you may feel moderate pain, or only a prick or stinging sensation. Afterward, there may be some throbbing.