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,
Fetal ultrasound is usually done by an ultrasound technologist or doctor in a doctor's office, hospital, or clinic. An early fetal ultrasound is one that is done before 18 to 20 weeks of pregnancy. The test takes 15 to 60 minutes. If the test doesn't show any problems, you may feel more at ease during your pregnancy. If the test shows that you are carrying more than one baby, you can plan ahead for a healthy pregnancy and delivery.