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📘 Chapter 10: Measuring Organs and Structures (Biometry)
📘 Chapter 10: Measuring Organs and Structures (Biometry)
✅ What You Will Learn:
✅ What You Will Learn:
What measurements are done in ultrasound
How to measure correctly
Common measurements in pregnancy and abdominal scans
Why measuring is important
📏 Why Do We Measure in Ultrasound?
📏 Why Do We Measure in Ultrasound?
To check if the organ or baby is the right size
To compare with normal values
To detect abnormal growth or swelling
To monitor progress over time
🧠 Common Measurements (Outside Pregnancy)
🧠 Common Measurements (Outside Pregnancy)
Organ
What to Measure
Normal Range (May Vary)
Liver
Length (top to bottom)
About 13–15 cm in adults
Kidney
Length (pole to pole)
9–12 cm
Bladder
Volume (when full)
300–500 ml
Gallbladder Wall
Thickness
<3 mm
Aorta
Diameter
<3 cm
🤰 Common Pregnancy Measurements (Fetal Biometry)
🤰 Common Pregnancy Measurements (Fetal Biometry)
Term
Full Meaning
What It Measures
CRL
Crown-Rump Length
Length of early fetus (used in 1st trimester)
BPD
Biparietal Diameter
Width of head (2nd and 3rd trimester)
FL
Femur Length
Length of thigh bone
AC
Abdominal Circumference
Roundness of baby’s belly
HC
Head Circumference
Around the skull
These help calculate gestational age and check for normal growth.
🛠️ How to Measure Correctly
🛠️ How to Measure Correctly
Freeze the image when it's clear
Use calipers or measuring tool on screen
Place the markers from edge to edge
Avoid measuring from shadow or unclear edges
Repeat if image is not good
💬 Tips
💬 Tips
Always measure in long axis when possible
Keep hands steady
Use zoom to improve accuracy
Save images with measurements labeled
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