Doctor insights on:
Is Gender A Factor In Vanishing Twin Syndrome
After healthy heart rates are identified in identical twins, what is the probability of a vanishing twin?
Fairly common: A conservative estimate of frequency is that vanishing twin syndrome occurs in 21-30% of multifetal pregnancies. More commonly identified now that first trimester ultrasound is widely used. There are no known preventive measures since the loss usually occurs because of cord implantation abnormalities. Thanks for trusting HealthTap! ...Read more
Demise of one fetus: Vanishing twin syndrome is the demise of one twin sometime during the pregnancy. One study suggested it occurred about 20-30% of twin pregnancies. Most commonly it occurs early in the pregnancy and generally the remaining fetus has a good outcome. Its' occurrence later in pregnancy can be associated with adverse maternal and fetal outcomes. ...Read moreSee 1 more doctor answer
Not usually: On www.Angelman.Org there is an explanation of the ways in which the genetic errors that cause angelman syndrome can occur.In a very few cases, there is an alteration in mother's ub3a gene or a balanced translocation on her chromosome 15 that increases risk, but usually it's a new mutation. ...Read more
Hidden Twin Syndrome: Before ultrasound imaging of pregnancy, a twin pregnancy was sometimes missed, and not realized until the twin is delivered at birth. Now with ultrasound imaging, a twin is seen during examination. There is no dangerous hidden twin syndrome to worry you. Relax aabout this. ...Read moreSee 1 more doctor answer
Eggs splice, or the two fraternal twins suffer from vanishing twin syndrome and the twin literally absorbs the other twin, what does this mean?
Conjoined placenta: Unfortunately, the placenta often becomes shared between the twins and the one with the better access to the cotyledons of the placenta thrives and the other twin does not. An alternate scenario is when the two fraternal fetal twins are joined together but one does not develop as well as the other prior to placental development in the first trimester. ...Read more
See below: Monozygotic twin births occur all over the world at a constant rate of 3.5 per 1000 births. Dizygotic twin births range from 6.7/1000 births in japan, to a high of 40/1000 births in nigeria. The two most important factors that influence dizygotic twinning are maternal age at conception, and the use of assisted reproductive technology. Due to the increasing tendency of women to delay pregnancy. ...Read moreSee 1 more doctor answer
What mutations cause fetal alcohol syndrome facial features in a baby or child, whose mother was a non-drinker?
First of all...: ...Alcoholics frequently deny that they drink; so if there are features suggesting fas, you have to be sure the mother really is a non-drinker. That said, cornelia de lange syndrome, velocardiofacial syndrome (vcfs), & dubowitz syndrome - & probably others - share features with fas, though they are rarer. A precise diagnosis requires a thorough exam and lab testing by an expert in this field. ...Read moreSee 1 more doctor answer
Increased chance: Women who have had a previous trisomic pregnancy, particularly those under 35 years of age at the time, appear to be at an increased risk of future pregnancies being trisomic.Evidence of increased risk of the same trisomy subsequent to a previous pregnancy with trisomy 13 or 18 the increase in risk being greater for women aged under 35 at the previous trisomic pregnancy. ...Read more
If a father transfers baldness gene and the mother side dont transfer baldness gene. Then is there any chance of baldness in a boy after two sisters ?
If a lady with ais syndrome does get successfully pregnant through ivf/donor egg is there any risk of the child inheriting the syndrome from birth mum?
AIS: No, ais cannot be passed through child-birth, but a lady with ais cannot be pregnant either. She has no uterus or oocytes so she can't either carry a child nor contribute eggs for conception in a gestational surrogate. If the oocytes are from a separate egg donor, the risk of ais is low, as in the general population. ...Read moreSee 1 more doctor answer
None.: Vanishing twin syndrome is probably much more common that people think; it results in a singleton pregnancy and current evidence suggests it is rather the norm than the exception. No test can predict this, only serial prenatal sonograms can document it. No specific therapeutic intervention is warranted. ...Read more
If 1 twin dies in utero (vanishing twin syndrome) is it likely or possible that the dead twins amniotic sac will continue to grow?
No. : The sac will not grow if the fetus does. ...Read more
22 or 21 whatever ?: Trisomy's are causes by an abnormality at conception. The egg & sperm are both expected to bring one chromosome from each of the parents 23 pairs.If an extra comes along in the egg or sperm (usually egg), the joining produces 22 pairs & one triplet or trisomy.Chromosomes carry the genes. Too many genes confuse the cell. Some lump this with gene disorders because gene docs follow the patients ...Read moreSee 1 more doctor answer
Which one?: The answer to your question will likely vary depending on which chromosome has been deleted. ...Read more
Laws of genetics: When a woman with Down's Syndrome forms gametes (unfertilized eggs), all the chromosomes except #21 will split evenly. Since Down's Syndrome means three copies of chromosome 21 (by dehfinition), the chromosome cannot split "evenly" - half will have 1 copy (normal); the other half will have 2 copies (Down's syndrome carrier). These will pair with 1 copy (usually) of Chromosome 21 from the father. ...Read moreSee 2 more doctor answers
Lifespan: In my clinical experience of 31 years practicing neonatal medicine, i would have to answer your question with a vague response. This is because each affected child does not necessarily have the same degree of affliction. The literature on this tells us that 99.9% die before a year of age. I have not seen one survive longer than two months, and I have seen many. ...Read more
Is it true that the chances of having a child with a chromosomal abnormality increases as a womans age increases over 40 year?
Yes: It actually increases to a small degree with every year after peak fertility in the mid 20's. At 40 the risk of a trisomy 21 down syndrome reaches 1% while at 45 it reaches 2%. This number is added to the random risk of 4% that any pregnancy has of an unexpected event (cleft palate, premi, other defect). ...Read more
Depends: When kids are diagnosed with gh deficiency, a brain MRI is done to look for anything which may be disturbing the pituitary gland. Most often, gh deficiency is idiopathic, meaning that we don't know. Being a fraternal twin does not influence the cause unless there might have been difficulties with either pregnancy or delivery. ...Read more
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