VENOUS COLOUR DOPPLER ULTRASOUND SCAN
Also Known As
Lab Test
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About The Test
What the test evaluates
- Detects deep-vein thrombosis (DVT) and superficial clots
- Measures blood-flow direction and speed
- Assesses vein wall compressibility and valve function
Why Cadabams Diagnostics is trusted
- 25+ years of imaging excellence
- NABL-accredited labs & ICMR-approved protocols
- Same-day soft-copy reports via secure email
What is Venous Colour Doppler Ultrasound Scan?
Definition and technology behind colour Doppler
A venous colour Doppler scan is a real-time ultrasound that adds colour-coded images to show blood moving toward or away from the probe. This lets the technologist “see” clots, reflux, or blockages that standard black-and-white ultrasound can miss.
Difference between standard ultrasound and colour Doppler
Feature | Standard Ultrasound | Colour Doppler |
---|---|---|
Shows anatomy | Yes | Yes |
Shows blood flow | No | Yes (colour) |
Detects clots | Limited | High accuracy |
Types of Venous Colour Doppler Ultrasound Scan
- Upper-limb venous Doppler – arms, subclavian, jugular veins
- Lower-limb venous Doppler – thighs, calves, popliteal veins
- Whole-leg vs targeted segmental studies – chosen by the radiologist based on symptoms
List of Parameters
- Vein compressibility – healthy veins collapse under probe pressure
- Blood flow direction & velocity – checks for reflux or obstruction
- Presence of thrombus or reflux – clot seen as a filling defect
- Valve competency – valves should prevent backward flow
Why This Test
- Rule out DVT before long flights or surgery
- Assess chronic venous insufficiency causing leg ulcers
- Pre-operative mapping for varicose-vein surgery
When to Take Test
Symptoms indicating a venous scan
- Sudden leg pain or heaviness
- Swelling in one limb
- Warmth or redness over a vein
- Visible varicose veins or skin ulcers
At-risk populations
- Post-surgery patients on bed rest
- Pregnancy (hormonal changes + pressure on pelvic veins)
- Sedentary office workers or long-haul travelers
- Smokers, cancer patients, or those on hormone therapy
Benefits
Benefits of Taking the Venous Colour Doppler Ultrasound Scan
- Non-invasive and painless – just gel and gentle probe pressure
- Real-time results – see blood flow instantly on screen
- Zero radiation – repeat as often as needed
Illnesses Diagnosed with Venous Colour Doppler Ultrasound Scan
- Deep Vein Thrombosis (DVT)
- Varicose veins & venous reflux
- Superficial thrombophlebitis
- Venous malformations or arteriovenous fistulas
Preparing for test
- Wear loose clothing; remove jewellery from limbs
- Fasting is not required – eat and drink normally
- Bring doctor’s referral and any previous scan reports
Pre-requisites Venous Colour Doppler Ultrasound Scan
- Doctor’s prescription (as per insurer or hospital protocol)
- Clean, dry skin on the limb to be scanned—avoid lotions
Best Time to Take the Venous Colour Doppler Ultrasound Scan
- Morning slots reduce leg swelling from day-long standing
- Urgent booking within 24 h if acute DVT is suspected
Eligibility
- Adults of all ages
- Safe in pregnancy – no radiation risk
- Pediatric scans on physician request (smaller probe used)
Procedure for Taking a Venous Colour Doppler Ultrasound Scan
- Duration: 30–45 minutes
- Position: Lie on your back; the limb may be slightly rotated
- Gel application: Water-based gel helps sound waves travel
- Probe movement: Technologist glides the probe along veins; you may hear “whooshing” sounds representing blood flow
Caution Before Taking the Test
- Inform staff of any contrast allergies (rarely used)
- Remove compression stockings 2 h before the exam to avoid false-negative results
Test Results
Results and Interpretations
Finding / Observation | Description | General Interpretation / Significance |
---|---|---|
Normal compressibility | Vein collapses fully with probe pressure | No clot |
Absent flow signal | No colour or spectral Doppler signal | Possible DVT |
Reversed flow | Colour shows blood moving backward | Valve incompetence / reflux |
Echogenic mass | Bright, solid area within vein lumen | Thrombus present |
Risks & Limitations
Minimal risk profile
- No radiation, no needles, no contrast dye
- Safe for pregnant women and kidney-compromised patients
Limitations
- Obesity or severe edema can blur images
- Very small calf veins may need follow-up MRI or venography
FAQs
Is the scan painful?
No—just cool gel and gentle pressure.
How soon can I resume normal activities?
Immediately; no downtime.
What clothing should I wear?
Loose-fitting clothes that can be rolled up above the knee or elbow.
Will insurance cover the test?
Most insurers reimburse—our front desk assists with cashless or reimbursement forms.
Can I eat or drink beforehand?
Yes, no fasting needed.