Paroxysmal cold hemoglobinuria (PCH) is a rare blood disorder in which the body's immune system produces antibodies that destroy red blood cells. It occurs when the person is exposed to cold temperatures.
PCH only occurs in the cold, and affects mainly the hands and feet. Antibodies attach (bind) to red blood cells. This allows other proteins in the blood (called complement) to also latch on. The antibodies destroy the red blood cells as they move through the body. As the cells are destroyed, hemoglobin, the part of red blood cells that carries oxygen, is released into the blood and passed in the urine.
PCH has been linked to secondary syphilis, tertiary syphilis, and other viral or bacterial infections. Sometimes the cause is unknown.
The disorder is rare.
Exams and Tests
Laboratory tests can help diagnose this condition.
- Bilirubin levels are high in blood and urine.
- Complete blood count (CBC) shows anemia.
- Coombs test is negative.
- Donath-Landsteiner test is positive.
- Lactate dehydrogenase level is high.
Treating the underlying condition can help. For example, if PCH is caused by syphilis, symptoms may get better when the syphilis is treated.
In some cases, medicines that suppress the immune system are used.
People with this disease often get better quickly and do not have symptoms between episodes. In most cases, the attacks end as soon as the damaged cells stop moving through the body.
Complications may include:
- Continued attacks
- Kidney failure
- Severe anemia
When to Contact a Medical Professional
Call your health care provider if you have symptoms of this disorder. The provider can rule out other causes of the symptoms and decide whether you need treatment.
People who have been diagnosed with this disease can prevent future attacks by staying out of the cold.
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Win N, Richards SJ. Acquired haemolytic anaemias. In: Bain BJ, Bates I, Laffan MA, eds. Dacie and Lewis Practical Haematology. 12th ed. Philadelphia, PA: Elsevier; 2017:chap 13.