Accurate dating sonogram

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c) The Femur length (FL) Measures the longest bone in the body and reflects the longitudinal growth of the fetus. 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.

Obstetric Ultrasound is the use of ultrasound scans in pregnancy.

Since its introduction in the late 1950s ultrasonography has become a very useful diagnostic tool in Obstetrics.

The diagnosis of missed abortion is usually made by serial ultrasound scans demonstrating lack of gestational development.

For example, if ultrasound scan demonstrates a 7mm embryo but cannot demonstrable a clearcut heartbeat, a missed abortion may be diagnosed.

Such measurements form the cornerstone in the assessment of gestational age, size and growth in the fetus.

A full bladder is often required for the procedure when abdominal scanning is done in early pregnency.

There may be some discomfort from pressure on the full bladder.

Repetitive arrays of ultrasound beams scan the fetus in thin slices and are reflected back onto the same transducer.

The information obtained from different reflections are recomposed back into a picture on the monitor screen (a sonogram, or ultrasonogram).

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