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Cryoglobulins

Contents of this page:

Illustrations

Blood test
Blood test
Cryoglobulinemia - of the fingers
Cryoglobulinemia - of the fingers

Definition    Return to top

Cryoglobulins are abnormal proteins. This article describes the blood test used to check for them.

When the body temperature is lower than 98.6 degrees F (37 degrees C), cryoglobulins no longer float in the blood. Instead, they separate out, forming clusters that can block small blood vessels, especially in the face and hands.

How the Test is Performed    Return to top

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.

How to Prepare for the Test    Return to top

There is no special preparation for this test.

How the Test Will Feel    Return to top

Some people feel discomfort when the needle is inserted. Afterward, there may be some throbbing.

Why the Test is Performed    Return to top

This test is most often done when a person's symptoms suggest a condition associated with cryoglobulins. Cryoglobulins are associated with several disorders, including those that affect the skin, joints, kidneys, and nervous system.

Normal Results    Return to top

Normally, there are no cryoglobulins.

Note: Normal value ranges may vary slightly among different laboratories. Talk to your doctor about the meaning of your specific test results.

What Abnormal Results Mean    Return to top

A positive test may indicate:

Additional conditions under which the test may be performed:

Risks    Return to top

There is very little risk involved with having your blood taken. Veins and arteries vary in size from one patient to another and from one side of the body to the other. Taking blood from some people may be more difficult than from others.

Other risks associated with having blood drawn are slight but may include:

Update Date: 2/22/2009

Updated by: Ariel D. Teitel, MD, MBA, Chief, Division of Rheumatology, St. Vincent’s Hospital, New York, NY. Review provided by VeriMed Healthcare Network. Also reviewed by David Zieve, MD, MHA, Medical Director, A.D.A.M., Inc.

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