OnLine Medical Statistics
to validate Medical Diagnostic Test ( C97 by S.Gerboni )

Digit your data Computed items True Positive ( Malati ) Total case number True Negative ( Sani ) Sensibility ( Malati ) False Positive ( Sani ) Specificity ( Sani ) False Negative ( Malati ) Positive Predictivity Negative Predictivity Test Bias Test Efficacy

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Bibliography :
"Ultrasonography in Obstetrics and Gynecology" by Peter W Callen, Second Edition, W.B. Saunders Company, Philadel phia 1988.

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BPD - Biparietal diameter
The transverse width of the head measured from the leading edge to the leading edge of the bones. The accuracy of gestational age varies during the pregnacy from +/- 1 week at 12 weeks to +/- 4 weeks after 30 weeks.

BPD in mm:

( E.G.) =

weeks

HC - Head Circumference
The accuracy of gestational age calculated from HC is sligtly better than that derived from BPD.

HC in mm :

( E.G.) =

weeks

AC - Abdominal Circumference
AC is measured at the widest point in the abdomen, through the liver at the level of the left portal vein or stomach. AC is determined not only by growing tissues (mainly liver) but also nutrient storage as subcutaneous fat and liver glycogen. It can be significantly decreased in nutritional growth retardation, and decreased in diabetic macrosomia where elevated blood glucose levels lead to increased metabolic storage.

AC in mm :

( E.G.) =

weeks

FL - Femur Length
Accuracy of gestational age from FL measurements is relatively independent of nutritional-growth retarding processes. The measurement is reliable, and FL is best measured after 14 weeks

FL in mm :

( E.G.) =

weeks

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settimane: <

mitrale anulus sist. in mm:		asse lungo V.S. in mm
tricuspide anulus sist. in mm:		asse lungo V.D. in mm
mitrale anulus diast. in mm		IVC in mm
tricuspide anulus diast. in mm		SVC in mm
Arteria Polmonare in mm		Anulus aortico in mm