Ultimately, BBS is distinguished from Laurence-Moon syndrome based on which genes are affected. However, one of the genetic mutations that cause BBS has also been found in individuals with Laurence-Moon syndrome, which illustrates the difficulty in distinguishing the two. There are 14 types of BBS, each of which is caused by a different genetic mutation. These 14 genes are BBS1, BBS2, ARL6 / BBS3, BBS4, BBS5, MKKS / BBS6, BBS7, TTC8 / BBS8, B1 / BBS9, C12ORF58 / BBS10, TRIM / BBS11, C4ORF24 / FLJ35630/BBS12, FLJ20345 / MKS1, and CEP290.
An ultrasound in pregnancy can be either done as a âroutineâ ultrasound, usually between 18-20 weeks or it is done for specific reasons which usually depend at the time of pregnancy. There are essentially three different types of ultrasounds, depending on how much information is required. 1  The limited ultrasound,
Dating ultrasound. In most cases, where there are no problems, you'll have two ultrasounds during your pregnancy. The first will be your dating ultrasound which is booked between 10 weeks and 13 weeks plus six days of your pregnancy.During your dating ultrasound, the sonographer will put gel on your belly and move a hand-held device, called a transducer, over your skin. You'll then be able to see a view of your baby.ating ultrasound. In most cases, where there are no problems, you'll have two ultrasounds during your pregnancy. The first will be your dating ultrasound which is booked between 10 weeks and 13 weeks plus six days of your pregnancy.