The normal spleen size in adults is measured by its maximum length from upper to lower pole, which should not exceed 13 cm. A thickness of 6 cm is also a useful cutoff. Size and weight vary between individuals. Splenomegaly is defined as a spleen weighing over 400g or with dimensions exceeding the normal range. Splenic size in children is measured by the long axis, with percentiles provided for different age groups from 0 months to 15 years.

1. Normal Spleen Size In Adults
• The spleen can be measured using a maximum length from upper to
lower pole, which shoulder not exceed 13 cm.(Ref David Sutton)
• A thickness of 6 cm, measured from the hilum to the opposite edge, is
also a useful cut-off when the length is borderline.
• Size and weight vary from person-to-person.(Ultrasound: The
Requisites.Book by William D. Middleton)

2. Splenomegaly
Weight above 400g
Classification of splenomegaly
Mild : 14cm – 16cm
> 400g - < 1000g
Moderate: 17cm – 21cm
> 400g - < 1000g
Spleenic area: 45cm2 – 65cm2
Massive: >8cm than normal
>1000g
>65cm2
(Ref swaoop J,O’Reily RA. Splenomegaly at university
hospital compared to nearby county hospital in 317 pt.WHO,world federation for
ultrasound in medicine and biology:manual of diagnostic ultrasound.2003)

4. Spleen Size (pediatric)
• The three numbers below represent the 10th percentile, median, and 90th percentile for the long
axis of the spleen (cm)
• 0-3 months: (3.3, 4.5, 5.8 cm)
• 3-6 months: (4.9, 5.3, 6.4 cm)
• 6-12 months: (5.2, 6.2, 6.8 cm)
• 1-2 years: (5.4, 6.9, 7.5 cm)
• 2-4 years: (6.4, 7.4, 8.6 cm)
• 4-6 years: (6.9, 7.8, 8.8 cm)
• 6-8 years: (7.0, 8.2, 9.6 cm)
• 8-10 years: (7.9, 9.2, 10.5 cm)
• 10-12 years: (8.6, 9.9, 10.9 cm)
• 12-15 years: (8.7, 10.1, 11.4 cm)
• Formula to measure average pediatric spleen size……5.5+1/3rd of age
(Ref Radiopeadia)