Cryoglobulins (Serum)

What Is a Cryoglobulin Screen Used For?

Doctors may order a cryoglobulin screen to investigate symptoms such as unexplained fevers, skin rashes, joint pain, or unexplained fatigue. It can also help diagnose conditions like vasculitis, infections, or autoimmune diseases that affect blood flow. Sometimes, it’s used alongside other tests to check for underlying causes of blood clumping.

How Is the Test Performed?

A blood sample is drawn from a vein in your arm. The blood is then tested in a lab to detect proteins that form clumps when cooled. The test typically takes a few hours to complete, and results are compared to known reference ranges for comparison.

What Are Common Symptoms Linked to High Cryoglobulins?

High levels of cryoglobulins may cause symptoms like cold sensitivity (where hands/feet feel numb or painful in cold), skin ulcers, muscle weakness, or nerve damage. Some people may also experience swelling in limbs, kidney issues, or frequent infections due to impaired blood flow.

What Conditions Might Require This Test?

Conditions that could lead to elevated cryoglobulins include chronic infections (e.g., hepatitis C), certain autoimmune diseases (e.g., rheumatoid arthritis), or rare blood vessel disorders. Your doctor may recommend this test if you have symptoms or risk factors for these conditions.