Hereditary spherocytosis and pregnancy

Folic acid is often taken daily, by those who have hereditary spherocytosis, to prevent anemia through folate deficiency. A typical dosage is perhaps between 1mg and 5mg per day. Folic acid is also important during pregnancy, to prevent neural tube defects in the baby, so it’s recommended that every pregnant woman take a 400µg supplement every day. This should be in addition to any folic acid that you are taking for hereditary spherocytosis, although, if you are already taking 5mg per day, then this is probably acceptable. For more information on folic acid, see the article Treating spherocytosis with vitamins.

If you still have your spleen, then it is likely that you will become more anemic while pregnant, with a significant increase in the rate at which red blood cells are broken down (rate of hemolysis). In some cases, the anemia can become serious enough to require blood transfusion, both during pregnancy and for a few months after. After giving birth, the level of anemia slowly returns to its previous point. There is no increased risk of miscarriage associated with this additional anemia.

A woman with a mild form of hereditary spherocytosis might only be diagnosed with hereditary spherocytosis when she becomes pregnant, as a result of this additional anemia.

If you have had your spleen removed (splenectomy) then there is not normally an increase in anemia associated with pregnancy. However, there could be problems related to high levels of platelets. After splenectomy, platelet levels rise. These high platelet levels normally last just a few weeks, but can, occasionally, remain for years. High platelet levels can cause internal clotting and when this occurs in the placenta, it can cause miscarriage. If you have high platelet levels during pregnancy then you should consider taking aspirin to help prevent clots, especially if you have a history of miscarriage.

During pregnancy, it might be useful to prearrange for the child to be tested for hereditary spherocytosis once they are born. This can help diagnose any problems that can occur immediately after birth, such as jaundice.

  • Buy the book on spherocytosis here.
    Subscribe to posts on spherocytosis here.


This entry was posted in Diagnosis / Testing, Related conditions, Spleen, Treatment. Bookmark the permalink.

2 Responses to Hereditary spherocytosis and pregnancy

  1. Katine says:

    Perhaps you should advise to have levels of folic acid checked before recommending taking them.My levels are actually high.Katine. Ps I’ve just been dx’d w PK deficiency after all these years of being an HS patient.

    • Chris Greenaway says:

      As with much of medicine, there are trade-offs.

      High folate levels have been shown to reduce the incidence of various cancers, but they have also been shown to increase the rate at which a cancer will grow, once it has formed.

      The balance of these two risks changes as we age. For children, high folate levels reduce the overall risk but, for those in retirement, high folate levels increase it. The effects are not especially large.

      Pregnant women are normally in their 20s or 30s, so high levels of folate are not a particular problem.

      Anemia and neural tube defects, however, are often significant problems when folate levels are low. Someone with spherocytosis typically has a higher rate of red blood cell production and so needs more folate. Pregnant woman are, in general, recommended to take additional folate to ensure that the embryo can develop correctly.

      The body can easily reduce folate levels by excreting it in the urine because folate is water soluble.

      Of course, testing levels of folate before taking supplements would be ideal. However, folate levels can change relatively rapidly, especially during pregnancy. So, in practice, it is simpler to ensure an adequate level.

      In someone who is not taking folate supplements, high levels of folate may be an indication of some underlying problem, such as B12 deficiency.

      As I understand it, pyruvate kinase deficiency has many aspects in common with spherocytosis: the red blood cells are more rigid than normal and so hemolysed more by the spleen; typical treatments include splenectomy and blood transfusion.