The Donath-Landsteiner test is a blood test to detect harmful antibodies related to a rare disorder called paroxysmal cold hemoglobinuria. The antibodies form and destroy red blood cells when the body is exposed to cold temperatures.
A blood sample is needed. For information on how this is done, see: Venipuncture
No special preparation is needed.
When the needle is inserted to draw blood, some people feel moderate pain, while others feel only a prick or stinging sensation. Afterward, there may be some throbbing.
This test is done to confirm a diagnosis of paroxysmal cold hemoglobinuria.
The test is considered normal if no Donath-Landsteiner antibodies are present.
Normal value ranges may vary slightly among different laboratories. Some labs use different measurements or test different samples. Talk to your doctor about the meaning of your specific test results.
Abnormal results mean Donath-Landsteiner antibodies are present. This is a sign of paroxysmal cold hemoglobinuria.
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:
Schwartz RS. Autoimmune and intravascular hemolytic anemias. In: Goldman L, Ausiello D, eds. Cecil Medicine. 24th ed. Philadelphia, Pa: Saunders Elsevier; 2011:chap 163.