Kidney Ultrasound & POCUS in Nephrology
Point-of-care ultrasound can extend the bedside nephrology examination with real-time assessment of the kidneys, urinary tract and selected volume-related findings. Renal POCUS can support focused evaluation of kidney size and morphology, hydronephrosis, bladder distension, renal cysts and other sonographic abnormalities when interpreted in the appropriate clinical context.
Portable ultrasound also allows renal imaging to be integrated with cardiac and lung POCUS when nephrologists need a broader bedside view of congestion and volume status.
How Ultrasound Supports Nephrology at the Point of Care
Kidney ultrasound is widely used to evaluate renal anatomy and to look for findings that may help explain changes in kidney function. At the bedside, a focused renal ultrasound examination can rapidly address specific clinical questions while complementing history, physical examination and laboratory data.
Kidney Size & Morphology
Long- and short-axis views can help assess renal size, contour and gross morphology. Renal length and parenchymal appearance may provide useful context when evaluating acute or chronic kidney disease.
Hydronephrosis
Renal POCUS can identify dilation of the collecting system and help detect hydronephrosis when urinary obstruction is part of the differential diagnosis.
Renal Cysts & Abnormalities
Ultrasound may reveal cystic or other focal renal abnormalities. Findings that are indeterminate, complex or outside the scope of a focused examination should prompt comprehensive diagnostic imaging.
Bladder & Urinary Retention
Bladder imaging can complement renal assessment by evaluating distension and, when clinically appropriate, estimating bladder volume or post-void residual.
Renal Calculi
Some renal stones appear as echogenic foci with posterior acoustic shadowing. Ultrasound may also demonstrate secondary signs of obstruction such as hydronephrosis.
Volume & Congestion Assessment
Renal imaging can be combined with lung and cardiac POCUS as part of a broader bedside assessment when fluid status and congestion are clinically relevant.
Renal Ultrasound in Kidney Disease
Renal ultrasound in kidney disease can provide focused information about kidney size, morphology, echogenicity and the collecting system while helping clinicians assess for findings such as hydronephrosis. A focused renal examination generally includes evaluation of both kidneys in longitudinal and transverse planes, with findings interpreted in the appropriate clinical context.
What Can Be Evaluated?
- Renal size and gross morphology
- Renal cortical and parenchymal appearance
- Relative renal echogenicity
- Hydronephrosis and collecting-system dilation
- Selected renal cysts or focal abnormalities
- Bladder distension and urinary retention
Clinical Context Matters
Ultrasound findings should not be interpreted in isolation. Renal function, urine output, laboratory findings, symptoms, medical history and the clinical question all influence interpretation.
In chronic kidney disease, renal ultrasound can contribute information about kidney size and morphology, while focused POCUS may also help identify potentially reversible obstructive findings.
Hydronephrosis on Renal Ultrasound
Hydronephrosis describes dilation of the renal collecting system and is an important sonographic finding when urinary obstruction is suspected. Ultrasound may demonstrate anechoic dilation of the renal pelvis and calyces, with the appearance varying according to severity and clinical context.
For a focused review of stone-related sonographic findings, obstruction and imaging considerations, see our Renal Ultrasound for Kidney Stones guide .
Bilateral kidney comparison can be useful. Hydration status, bladder distension and normal variants such as an extrarenal pelvis may influence the appearance, so a sonographic finding of hydronephrosis should always be interpreted alongside the patient's presentation.
Obstructive Questions
In patients with acute kidney injury, oliguria or urinary symptoms, focused renal ultrasound can help determine whether collecting-system dilation is present.
Kidney Stones
Renal calculi may appear hyperechoic and produce posterior acoustic shadowing. Ureteral stones can be difficult to visualize directly, making secondary findings such as hydronephrosis clinically useful.
Renal Ultrasound & Kidney POCUS Cases
These short ultrasound examples demonstrate renal anatomy and selected findings encountered during kidney POCUS. They are provided for educational illustration and should not be used as stand-alone diagnostic guidance.
Kidney Ultrasound & Measurement
Renal imaging demonstrating kidney visualization and measurement during a focused ultrasound examination.
Hydronephrosis
Kidney POCUS demonstrating dilation of the renal collecting system consistent with hydronephrosis.
Renal Cyst
Ultrasound appearance of a renal cyst during a focused kidney examination.
Chronic Kidney Failure
Kidney ultrasound from a dialysis-dependent patient illustrating abnormal renal appearance in advanced chronic kidney disease.
Kidney Stone & Posterior Shadowing
Left renal calculus demonstrating an echogenic focus with posterior acoustic shadowing.
Beyond the Kidney: Cardiorenal & Volume Assessment
Nephrology POCUS does not have to stop at the kidneys. When the clinical question involves congestion or volume status, renal imaging can be integrated with focused cardiac and lung ultrasound to provide additional bedside information.
Kidneys & Bladder
Assess renal morphology, collecting systems and the bladder for focused urinary findings relevant to the clinical question.
Lung POCUS
Lung ultrasound can complement the bedside assessment when pulmonary congestion or pleural fluid is clinically relevant.
Focused Cardiac Ultrasound
Focused cardiac views may add information about cardiac function and hemodynamic context when used by appropriately trained clinicians.
Explore our Cardiac POCUS, Lung POCUS and Critical Care specialty resources for related bedside ultrasound applications.
Handheld Ultrasound for Nephrology POCUS
Handheld ultrasound can make focused renal imaging available at the bedside, in dialysis-related care environments and in other settings where portability and rapid access to ultrasound are valuable. Device selection should consider image quality, probe configuration, Doppler capability, workflow, battery performance and the range of POCUS examinations a clinician intends to perform.
Sono Mobile® CL64
Sono Mobile® CL64 combines convex and linear scanning capability with a phased-array preset in a compact wireless platform. The convex side supports abdominal and renal imaging, while the broader probe configuration allows the same device to support vascular access and other POCUS applications.
For nephrology teams using ultrasound across renal, vascular and cardiorespiratory bedside assessments, a multi-purpose handheld platform can reduce the need to switch between separate devices.
Nephrology Workflow
- Wireless bedside imaging
- Convex renal and abdominal scanning
- Color and PW Doppler capability
- Linear imaging for vascular applications
- Cardiac preset for broader POCUS workflows
- Subscription-free application
Related POCUS & Clinical Specialties
Clinical Resources for Renal Ultrasound & POCUS
The following professional resources provide additional guidance on point-of-care renal ultrasound, renal imaging and focused urinary-system assessment.
Nephrology POCUS FAQ
What can kidney ultrasound show in nephrology?
Kidney ultrasound can provide information about renal size, morphology, echogenicity, collecting-system dilation and selected focal abnormalities such as cysts. Focused renal POCUS may also include bladder assessment depending on the clinical question.
Can POCUS identify hydronephrosis?
Yes. Focused renal ultrasound can demonstrate dilation of the renal pelvis and calyces consistent with hydronephrosis. The finding should be interpreted in clinical context because hydration, bladder distension and normal variants can affect the sonographic appearance.
Is renal ultrasound useful in kidney disease?
Ultrasound can contribute information about kidney size, morphology and obstruction in patients with renal dysfunction. The role of a focused POCUS examination depends on the clinical question and does not replace comprehensive imaging when a complete diagnostic study is required.
Can kidney stones be seen with ultrasound?
Some renal calculi can be visualized as echogenic foci with posterior acoustic shadowing. Ureteral stones may be difficult to visualize directly, so secondary findings such as hydronephrosis may also be important.
Can handheld ultrasound be used for renal POCUS?
Handheld ultrasound can support focused kidney and bladder imaging when the device provides suitable image quality and the examination is performed and interpreted by an appropriately trained healthcare professional.
Can nephrology POCUS include lung and cardiac ultrasound?
Yes. Depending on training and the clinical question, nephrology POCUS may extend beyond the urinary system to include focused lung and cardiac imaging as part of a broader bedside assessment of congestion and volume status.