Usg doppler of upperlimb and lower limb

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ACR Appropriateness Criteria ultrasound duplex Doppler upper lower extremity arterial venous disease

USG Doppler of upper limb and lower limb is a noninvasive ultrasound test that evaluates blood flow in the arteries and veins of the arms or legs. It uses sound waves, so there is no radiation and usually no injection.

Type	What it assesses	Common reasons
Venous Doppler	Vein compressibility and direction/speed of flow	Suspected deep-vein thrombosis (DVT), limb swelling, pain, varicose veins, venous insufficiency
Arterial Doppler	Arterial narrowing, blockage, aneurysm, or reduced distal flow	Cold/painful limb, reduced pulses, claudication, diabetic foot ischemia, trauma, graft follow-up

Upper-limb Doppler

It may examine the subclavian, axillary, brachial, radial, ulnar, and arm veins. It is often ordered for:

Arm swelling or suspected upper-extremity DVT
Dialysis fistula assessment
Suspected arterial blockage after trauma or catheterization
Thoracic outlet-related vascular compression

For suspected upper-extremity DVT, duplex Doppler ultrasound is usually an appropriate initial test, according to the ACR imaging criteria.

Lower-limb Doppler

It may examine the iliac, femoral, popliteal, tibial, dorsalis pedis arteries and the deep/superficial veins. It is commonly ordered for:

Leg swelling, calf pain, or suspected DVT
Varicose veins and chronic venous insufficiency
Peripheral arterial disease, claudication, nonhealing foot ulcers
Acute ischemia, trauma, aneurysm, or post-procedure surveillance

For suspected lower-extremity DVT, lower-limb duplex Doppler is also considered an appropriate first-line imaging study in the ACR criteria.

What happens during the scan

Gel is placed on the skin.
A probe is moved over the limb.
For venous studies, the sonographer gently compresses veins at several points.
The test generally takes 20-45 minutes per limb/region, is painless, and needs little preparation.

Important

Ask the clinician whether the prescription is for arterial Doppler, venous Doppler, or both, and which limb/side is needed. If there is sudden severe limb pain, pallor/coldness, weakness, or major swelling with breathlessness/chest pain, seek urgent medical care.

Tell me in detail about the probe and how to operate the potable USG machine while ruling out DVT of upper and lower limb

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Society Radiologists Ultrasound consensus lower extremity DVT ultrasound protocol compression Doppler upper extremity

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ultrasound compression test deep vein thrombosis normal vein and thrombus color Doppler

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Portable ultrasound for suspected DVT: practical guide

A bedside portable ultrasound can rapidly identify proximal DVT when used by a trained clinician. It should not be used to declare “no DVT” unless your scan is complete, technically adequate, and interpreted within an established local protocol. In particular, a negative limited point-of-care scan does not exclude isolated calf DVT, pelvic/iliac thrombosis, or central upper-limb thrombosis.

For symptomatic suspected upper-extremity DVT, duplex Doppler ultrasound is an appropriate initial test, per the ACR guidance.

1. Probe selection

First choice: linear high-frequency probe

Use a linear-array vascular probe, usually 5-12 MHz or 6-15 MHz.

Best for superficial veins in the neck, arm, groin, thigh, popliteal fossa, and calf.
Produces a rectangular image.
Gives high resolution for vein walls, compression, intraluminal thrombus, and color flow.

When to use a curvilinear probe

Use a low-frequency curvilinear probe, roughly 2-5 MHz, when structures are deep or poorly seen with the linear probe:

Obese patient
Deep common femoral vein
Iliac veins, if attempting a limited proximal assessment
Deep pelvic vessels

Limitation: Iliac and pelvic veins are often not reliably excluded by bedside ultrasound because of depth, bowel gas, and overlying anatomy.

Phased-array probe

Not routine for extremity DVT. It may help through narrow acoustic windows around the clavicle, but it is usually inferior to a linear probe for superficial venous compression.

2. Machine setup on a portable USG

Select the preset closest to:

Vascular
Venous
DVT
If unavailable: Small parts or MSK, then manually optimize.

Basic image settings

Control	Practical setting
Mode	Begin with 2D B-mode grayscale
Depth	Set the vein at the center to lower third of the screen. Do not use excessive depth.
Frequency	Start high with linear probe. Reduce frequency only if penetration is inadequate.
Gain	Adjust until blood is mostly dark but vessel walls and thrombus are visible. Too much gain can mimic internal echoes or clot.
Focus	Put focal marker at, or just below, the target vein.
Dynamic range	Moderate range, if adjustable. This helps differentiate wall, soft tissue, and thrombus.
Probe marker	For transverse views, marker generally points to the patient's right. For longitudinal views, marker points cephalad. Follow your local convention.

Color Doppler settings

Color Doppler is an adjunct. Compression is the primary test for accessible veins.

Use a small color box over the vessel to maintain frame rate.
Set color scale/PRF low enough for slow venous flow, commonly around 5-15 cm/s or a low-venous-flow preset.
Increase color gain until faint random color speckle appears, then reduce it slightly until speckle disappears.
Use minimal probe pressure while assessing color flow, since excess pressure can collapse the vein and falsely eliminate flow.
Use a suitable steering angle on a linear probe for longitudinal vessels, if available.

Spectral Doppler settings

Use spectral Doppler especially for:

Subclavian vein, which cannot be compressed beneath the clavicle
Internal jugular and axillary veins
Comparing the symptomatic side with the opposite side
Assessing respiratory phasicity, augmentation, or suspected proximal obstruction

Settings:

Obtain the spectral tracing in long axis.
Use a small sample gate placed centrally in the vein.
Low PRF/scale and low wall filter.
Use an angle correction of about 45-60 degrees if measuring velocity. For routine DVT screening, waveform behavior is often more important than precise velocity.

3. What proves or suggests DVT?

Most important finding

Failure of a normally accessible vein to completely compress in short axis is the key ultrasound sign of DVT.

A normal vein:

Is thin walled
Has no intraluminal material
Is usually larger and more deformable than the adjacent artery
Completely collapses with firm but controlled transducer pressure

A vein with DVT may show:

Partial or complete noncompressibility
Intraluminal echogenic material
Enlarged vein in acute DVT
Absent or incomplete color filling
Abnormal spectral Doppler waveform
Poor or absent response to distal augmentation

Do not diagnose DVT from echogenic material alone. The compressibility test, color filling, and Doppler pattern must be interpreted together.

The emergency-ultrasound text describes noncompressibility as the hallmark of DVT, with echogenic thrombus often visible. It also notes that a high-frequency linear probe is typical for lower-limb venous compression scanning. ROSEN's Emergency Medicine: Concepts and Clinical Practice, 10th ed., p. 3625.

Acute versus chronic clot

Avoid overconfident clot aging at the bedside.

Acute thrombus: vein may be distended, clot may be hypoechoic, and the vein is noncompressible.
Chronic post-thrombotic change: vein may be small, irregular, partially compressible, with echogenic wall thickening, synechiae, or collateral vessels.

If prior DVT exists, comparison with previous imaging and a formal vascular ultrasound report are particularly important.

4. Lower-limb DVT scan

Patient position

Place the patient supine.
Slightly elevate the torso if this improves comfort.
Externally rotate the hip and flex the knee slightly for groin access.
For popliteal scanning, flex the knee or position the patient lateral/prone if possible.
Reverse Trendelenburg or dependency may distend veins and improve visibility.

Core scanning rule

Scan in transverse (short-axis) and apply compression every 1-2 cm through the visible vein. The artery serves as a landmark but should not be compressed aggressively.

Standard lower-limb sequence

A. Groin and common femoral region

Identify:

Common femoral vein (CFV)
Common femoral artery
Great saphenous vein at the saphenofemoral junction
Deep femoral vein at its confluence
Femoral vein

At each level:

Identify artery and vein in B-mode.
Confirm vein with gentle compression.
Apply enough pressure to obliterate a normal vein completely.
Save an image or cine loop before and during compression.
Check color flow when needed.
Obtain spectral Doppler at the CFV, noting respiratory phasicity.

Important terminology: The “superficial femoral vein” is a deep vein despite its name. Prefer calling it simply the femoral vein.

B. Femoral vein through the thigh

Track the femoral vein as far distally as possible.

Compress at short intervals.
Remember that the femoral vein may be duplicated. Scan carefully to avoid overlooking a duplicated channel containing thrombus.

C. Popliteal fossa

Identify:

Popliteal vein, often superficial to the artery depending on level and position
Popliteal artery
Trifurcation area, when visible

Compress the popliteal vein at multiple levels.

D. Calf veins

A comprehensive formal study generally evaluates:

Posterior tibial veins
Peroneal veins
Often gastrocnemius and soleal veins where symptomatic or indicated

These can be technically difficult with POCUS. A negative two-point or three-point scan does not reliably exclude isolated calf DVT.

Limited versus comprehensive lower-limb examination

Examination	Main sites	Meaning of a negative result
Two-point POCUS	Common femoral region and popliteal vein	Does not exclude femoral-thigh or calf DVT
Three-point POCUS	Common femoral, femoral vein through thigh, popliteal	Better proximal assessment but still may miss calf or iliac DVT
Comprehensive duplex	Proximal veins plus calf veins, with grayscale, compression, color, and spectral Doppler	Formal diagnostic study, subject to technical quality and local protocol

The 2-zone approach examines the common femoral region and popliteal region; the 3-zone approach adds the femoral vein through the thigh. ROSEN's Emergency Medicine: Concepts and Clinical Practice, 10th ed., p. 3625.

5. Upper-limb DVT scan

Upper-limb scanning differs from leg scanning because the subclavian and brachiocephalic veins are partly hidden by bone and cannot be directly compressed.

Patient position

Ideally supine or semi-recumbent.
Arm relaxed by the side, then externally rotated or abducted as needed.
Turn the head slightly away for internal jugular access.
Avoid extreme arm positioning unless investigating thoracic-outlet-type positional compression.

Standard upper-limb sequence

A. Internal jugular vein

At the lower neck:

Find the internal jugular vein lateral to the carotid artery.
Scan in transverse view.
Perform graded compression.
Assess color and spectral Doppler.

B. Subclavian vein

At the infraclavicular or supraclavicular window:

Follow the axillary vein medially as it becomes the subclavian vein.
Use color and spectral Doppler.
Do not rely on compression because the clavicle prevents adequate compression.

Look for:

Spontaneous venous flow
Respiratory phasicity
Color filling
Response to distal arm augmentation
Comparison with the contralateral subclavian vein if needed

A continuous, nonphasic waveform or poor augmentation can suggest obstruction proximal to the sampling site, but this is not specific and needs formal interpretation.

C. Axillary vein

Scan in the axilla or proximal medial arm.
Compress in transverse view.
Add color and spectral Doppler.

D. Brachial veins

Usually paired around the brachial artery.
Scan from axilla to antecubital fossa.
Compress each vein separately and carefully.

E. Basilic and cephalic veins

These are superficial veins but should be evaluated when:

Symptoms are focal
There is a PICC line or peripheral venous catheter
Thrombophlebitis is suspected
The clinical request includes superficial thrombosis assessment

Upper-limb documentation standard

A formal study uses:

Grayscale, color, and spectral Doppler of accessible internal jugular, subclavian, axillary, and brachiocephalic veins
Compression images of internal jugular, axillary, brachial, basilic, and cephalic veins
Additional forearm scanning when symptoms are there or standard images do not explain symptoms

This aligns with the ACR-AIUM-SRU practice parameter.

6. Distal augmentation

Augmentation tests whether flow increases after distal compression.

Lower limb

Place spectral Doppler in the femoral or popliteal vein.
Compress the calf distally.
Normal response: a brief increase in venous flow.

Upper limb

Place spectral Doppler in axillary or subclavian vein.
Gently squeeze the forearm or distal arm.
Normal response: transient increased venous flow.

Cautions

A negative augmentation response can be due to thrombus, proximal obstruction, poor technique, excessive transducer pressure, pain/guarding, or low flow.
It is supportive only. It does not replace direct compression where compression is possible.
Avoid vigorous massage of a limb with known/suspected DVT.

7. A simple portable-machine workflow

Confirm order and laterality: upper/lower limb, right/left, venous DVT study.
Review risk factors and symptoms: swelling, pain, cancer, immobility, central venous line/PICC, recent surgery, prior DVT.
Select linear probe and venous preset.
Set depth, gain, and focus before beginning.
Start in transverse B-mode.
Identify the vein and artery.
Perform complete graded compression at each accessible level.
Add color Doppler if compression is equivocal, a central vein is noncompressible, or flow needs confirmation.
Use spectral Doppler at common femoral/popliteal or internal jugular/subclavian/axillary levels as applicable.
Scan the symptomatic site even if it is outside the routine pathway.
Compare with the opposite side when waveform asymmetry or central obstruction is suspected.
Save labeled images/cine loops of relevant normal landmarks and all abnormalities.
Escalate for formal comprehensive duplex if the study is incomplete, technically limited, clinical probability remains high, or findings are uncertain.

8. When not to rule out DVT with a portable scan alone

Obtain urgent formal imaging or specialist assessment if:

You cannot fully compress or visualize a targeted segment.
There is high pretest probability despite a negative limited POCUS.
Symptoms suggest iliac/pelvic DVT: entire-leg swelling, groin pain, marked unilateral swelling with normal femoral/popliteal scan.
There is suspected subclavian/brachiocephalic thrombosis, especially with a PICC, central line, pacemaker lead, or arm/chest wall collateral veins.
There is prior DVT or suspected chronic post-thrombotic change.
The patient is pregnant, has cancer, or has severe symptoms with an incomplete study.
The patient has symptoms/signs of pulmonary embolism, such as chest pain, dyspnea, syncope, hemoptysis, tachycardia, or hypoxia.

Recent evidence on clinician-performed ultrasound supports its diagnostic utility, but results depend on training, protocol, and operator experience. A 2024 systematic review is indexed as PMID 38596931.

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