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If you have moderate or severe thrombocytopenia, it’s more likely to be caused by a condition you already have, such as lupus. If your count is below 50 million per ml of blood, your doctor will class it as severe thrombocytopenia, although this is very rare. Your doctor will class this as moderate gestational thrombocytopenia. This happens to about one in 100 pregnant women. You should be offered extra tests if your platelet count falls below 100 million per ml of blood. The result is that you have fewer, but younger and larger, platelets in your blood. In pregnancy, this process is speeded up.

Your body naturally destroys platelets if they’re not used and replaces them with new ones.

This doesn’t affect how well the platelets work, though. This means that the platelets are more diluted, so you have fewer platelets per millilitre of blood.

Your body produces more of the liquid part of blood (plasma) while you’re pregnant.

Your platelet levels will return to normal in the weeks after your baby is born.ĭoctors aren't sure why gestational thrombocytopenia happens, but two factors may play a part: Your midwife or obstetrician will continue to monitor your platelet count throughout the rest of your pregnancy, in case it drops further. If your platelet count is only slightly below normal, it shouldn’t cause you or your baby any problems and you won’t need any treatment. When your count dips to between 100 million and 150 million platelets per ml of blood, your doctor will diagnose mild gestational thrombocytopenia.

But, for most women, the count is still in the normal range. Pregnancy naturally causes a slight fall in your platelet count, particularly if you’re expecting twins. On average, adults have between 150 million and 450 million platelets per millilitre (ml) of blood. Platelets are cells that help your blood to clot when it needs to. Your platelet count is usually checked during a routine blood test, taken at one of your antenatal appointments. It affects about one pregnant woman in 10 and usually develops in mid to late pregnancy. If your platelet count drops below normal levels during pregnancy, it's most likely that you have a common pregnancy condition called gestational thrombocytopenia.