When you should check Fetal Anomalies?

 

An ultrasound is done in most pregnancies around the mid part of a pregnancy. This is sonographical study is known as the fetal anatomy survey or the fetal anomaly screen. It is recommended to do a scan on 18-22 weeks of pregnanancy.
  
The way this scan is done is that woman will have a full bladder before the start of the exam. Sonologist  will do ultrasound . woman pregnant belly will have a special gel placed on it to help enhance the picture from the sound waves of the ultrasound. you, or in some cases the physician, will use the ultrasound transducer wand and move it over her abdomen.
  
An ultrasound is done in most pregnancies around the mid part of a pregnancy. This is sonographical study is known as the fetal anatomy survey or the fetal anomaly screen. It is recommended to do a scan on 18-22 weeks of pregnanancy. The way this scan is done is that woman will have a full bladder before the start of the exam. Sonologist  will do ultrasound . woman pregnant belly will have a special gel placed on it to help enhance the picture from the sound waves of the ultrasound. you, or in some cases the physician, will use the ultrasound transducer wand and move it over her abdomen.
Ultrasonologist determine things about  baby and  pregnancy. You need to look on the  size of  baby in comparison to others babies of the same gestational age or they may look at placenta.
 

 
 
We often talk about how the first thing we'll do after our baby is born is to count fingers and toes. Now ultrasound technology can enable use to count fingers and toes prior to birth. Though being able to count each finger and toe can depend on how cooperative baby is being during the ultrasound exam.

 

 

It is more likely that sonologistwill be able to see bigger areas like  baby's limbs - arms and legs. Ultrasound technician will measure  baby's thigh bone (femur), the tibia and fibula. These will also help calculate how well  baby is growing for his or her gestational age.In addition to look at the legs, Sonologist should also  measure parts of  baby's arms. The bones of the arms (radius, ulna) are measured when possible.
 

 

 
BPD The diameter between the 2 sides of the head. This is measured after 13 weeks. It increases from about 2.4 cm at 13 weeks to about 9.5 cm at term. Different babies of the same weight can have different head size, therefore dating in the later part of pregnancy is generally considered unreliable. (Chart and further comments) Dating using the BPD should be done as early as is feasible.
 

BPD 
The single most important measurement to make in late pregnancy. It reflects more of fetal size and weight rather than age. Serial measurements are useful in monitoring growth of the fetus. (Chart and further comments) AC measurements should not be used for dating a fetus.

Abdominal Circumference
The Femur length  Measures the longest bone in the body and reflects the longitudinal growth of the fetus. Its usefulness is similar to the BPD. It increases from about 1.5 cm at 14 weeks to about 7.8 cm at term. (Chart and further comments) Similar to the BPD, dating using the FL should be done as early as is feasible.
 

28 Week

Ultrasonography has become indispensible in the localization of the site of the placenta and determining its lower edges, thus making a diagnosis or an exclusion of placenta previa. Other placental abnormalities in conditions such as diabetes, fetal hydrops, Rh isoimmunization and severe intrauterine growth retardation can also be assessed.

Placenta

Transvaginal Scan With specially designed probes, ultrasound scanning can be done with the probe placed in the vagina of the patient. This method usually provides better images (and therefore more information) in patients who are obese and/ or in the early stages of pregnancy. The better images are the result of the scanhead's closer proximity to the uterus and the higher frequency used in the transducer array resulting in higher resolving power. Fetal cardiac pulsation can be clearly observed as early as 6 weeks of gestation.

 

 

TVS Scan 6 week

The sex of the baby can usually be determined by ultrasound at any time after 16 weeks, often at the dating scan around 20 weeks into the pregnancy depending upon the quality of the sonographic machine and skill of the operator. This is also the best time to have an ultrasound done as most infants are the same size at this stage of development. Depending on the skill of the sonographer, ultrasound may suffer from a high rate of false negatives and false positives. This means care has to be taken in interpreting the accuracy of the scan.

 

 

Boy

 

 

Mon, 23/11/2009 - 1:47pm | admin
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