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I saw a Consultant this week who explained that the sample of pregnancy tissue sent off after my ERPC had Trisomy 22. This means the pregnancy had three chromosome 22s as opposed to the normal two. He suggested that there is probably only a 1% chance that either myself or S are carriers of Trisomy 22. More likely it is just a random mutation caused when the egg or sperm was created during the dividing process known as meiosis. Normally an egg or a sperm has just one set of each chromosome if something goes wrong during meiosis and a sperm or egg ends up with two copies of a chromosome and that sperm or egg is fertilized the resulting embryo will have three copies of a chromosome instead of two. Trisomies can happen on lots of chromosomes. The most famous Trisomy is Trisomy 21 - it's better known name is Down's Syndrome.
I of course Googled Trismy 22 and found out it accounts for around 3% of first trimester miscarriages. Pregnancies with it rarely progress past the first trimester.
The Consultant explained that everyone has a chance of having a Trisomy pregnancy and that chance increases with age. Because I have had one Trisomy pregnancy now he believes my chance of a second one is increased. He didn't say by how much. And a second Trisomy could occur on any of the chromosomes, including 21. He guessed that at my age (33) the chance of a Down's Syndrome baby is normally around 1 in 600 and now I have had one Trisomy pregnancy is is probably about 1 in 400, so still very small. In any future pregnancy I will be referred to the Foetal Medicine Unit at my hospital at around 11 to 12 weeks to discuss the Trisomy issue.
We are also being referred to the Hospital's Recurrent Miscarriage Clinic. The Consultant agreed we not only need to be tested to see if we are Trisomy 22 carriers but for other miscarriage causes. He said the Clinic will also be able to explain the odds of Trisomies reoccurring more accurately. I am really pleased after all I have wanted tests for ages. But at the same time I am still a little disappointed because it takes so long. We were told to expect a letter giving us an appointment within a month. No idea when the actual appointment will be. The NHS is very, very, very slow.
We asked the Consultant whether it is okay to try for another pregnancy, he agreed it is fine. He tried to end the meeting happily by explaining that it is not unusual for women with my pregnancy history to have healthy babies. I am trying to convince myself I will be one of these women.