Overview: SFU Grading System

Select a SFU Grade below to view details and learn more.

Ultrasound
Grade

Pelvis

Minor
Calyces

Parenchyma

0

Not
Imaged

Not
Imaged

Intact

1

Intrarenal
(Thin Stripe)

Not
Imaged

Intact

2

Intrarenal
(Broad Stripe)

Not
Imaged

Intact

2.1 Extrarenal Pelvis

Extrarenal

Not
Dilated

Intact

2.2 Dilated Major Calyces

Extrarenal

Not
Dilated

Intact

3

Extrarenal

Uniform
Dilation

Intact

3.1 Elongated Kidney

Extrarenal

Uniform
Dilation

Intact

4

Extrarenal

Uniform
Dilation

Thin

SFU Grade 0

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Pelvis Major
Calyces Minor
Calyces Parenchyma

SFU Grade Key

Pelvis: Inside Hilum and not imaged

Major Calyces: Not Imaged

Minor Calyces: Not Imaged

Parenchyma: Intact

SFU Grade 1

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Pelvis Major
Calyces Minor
Calyces Parenchyma

SFU Grade Key

Pelvis: Inside Hilum. Pelvis is a thin
urine stripe.

Major Calyces: Not Dilated

Minor Calyces: Not Imaged

Parenchyma: Intact

SFU Grade 2

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Pelvis Major
Calyces Minor
Calyces Parenchyma

SFU Grade Key

Pelvis: Inside Hilum

Major Calyces: Not Dilated

Minor Calyces: Not Dilated

Parenchyma: Intact

SFU Grade 2.1
Variant: Extrarenal Pelvis

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Pelvis Major
Calyces Minor
Calyces Parenchyma

SFU Grade Key

Pelvis: Outside Hilum

Major Calyces: Not Dilated

Minor Calyces: Not Dilated

Parenchyma: Intact

SFU Grade 2.2
Variant: Dilated Major Calyces

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Pelvis Major
Calyces Minor
Calyces Parenchyma

SFU Grade Key

Pelvis: Outside Hilum

Major Calyces: Not Dilated

Minor Calyces: Not Dilated

Parenchyma: Intact

SFU Grade 3

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Pelvis Major
Calyces Minor
Calyces Parenchyma

SFU Grade Key

Pelvis: Outside Hilum

Major Calyces: Dilated

Minor Calyces: Uniformly Dilated

Parenchyma: Intact

SFU Grade 3.1
Variant: Elongated Kidney

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Pelvis Major
Calyces Minor
Calyces Parenchyma

SFU Grade Key

Pelvis: Outside Hilum

Major Calyces: Dilated

Minor Calyces: Uniformly Dilated

Parenchyma: Intact

SFU Grade 4

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Pelvis Major
Calyces Minor
Calyces Parenchyma

SFU Grade Key

Pelvis: Outside Hilum

Major Calyces: Dilated

Minor Calyces: Uniformly Dilated

Parenchyma: Thin, less than 4mm