VascularPublished: September 2026·Updated: September 2026·10 min read

Vascular Medicine Specialist: Singapore's Only ABVM Doctor

A vascular medicine specialist is a physician who diagnoses and manages diseases of the arteries, veins and lymphatic vessels — without operating. In much of the world the same doctor is called an angiologist, and the vein-focused part of the work is called phlebology. It is a recognised standalone specialty across Europe and an established subspecialty in the United States, yet in Singapore it does not exist as a training track at all. Patients with a blocked leg artery, a stubborn clot or worsening varicose veins tend to bounce between a vascular surgeon and a cardiologist, with no one owning the medical, non-surgical middle ground. Dr. Peter Chang trained in that middle ground in the United States and holds certification from the American Board of Vascular Medicine — as far as we know, the only doctor in Singapore who does.

Dr. Peter Chang

Triple Board-Certified Cardiologist & Vascular Specialist

What a Vascular Medicine Specialist Actually Does

The European medical bodies define vascular medicine as the specialty dealing with diseases of the arteries, veins, lymphatics and microcirculation — covering prevention, diagnosis, treatment and rehabilitation. In plain terms, a vascular medicine specialist looks after the entire circulation outside the heart itself, and does so mainly with medication, risk-factor control, compression, structured exercise and minimally invasive (keyhole) procedures rather than open surgery.

Day to day in Singapore that means:

Peripheral arterial disease — leg pain on walking, cold or discoloured feet, wounds that will not heal
Deep vein thrombosis and pulmonary embolism — diagnosis, choice and duration of blood thinners, and clot-removal decisions
Varicose veins, spider veins and chronic venous insufficiency — assessment and non-surgical treatment
Leg and arm swelling, including lymphoedema, and the search for its cause
Raynaud's, vasculitis, thrombophilia (an inherited tendency to clot), and surveillance of small aneurysms

Angiologist, Phlebologist, Vascular Medicine: Same Thing?

Mostly, yes. Angiology and vascular medicine are synonyms — which word a country uses is a matter of tradition. In 2013 the European specialty bodies agreed a single definition covering both. So an angiologist in Germany, Switzerland or Italy does the same job as a vascular medicine physician in the United States.

Phlebology is narrower: it is the medicine of the veins only — varicose veins, venous reflux, leg ulcers, thrombosis. Every phlebologist is working within vascular medicine, but not every vascular medicine specialist limits themselves to veins. The looser term vascular specialist is an umbrella that also includes vascular surgeons, which is why it causes so much confusion for patients in Singapore trying to work out who to see.

How It Differs From a Vascular Surgeon

The simplest distinction: a vascular medicine specialist does not perform open operations, and a vascular surgeon does. The surgeon's toolkit includes bypass grafts, open repair of large aneurysms, and carotid endarterectomy — procedures that genuinely require an operating theatre.

Everything up to that point overlaps. Both assess circulation, both order and interpret duplex ultrasound, both prescribe blood thinners and statins, and both perform endovascular work such as angioplasty and stenting. In practice the vascular medicine specialist is often the first doctor a patient sees and the one who manages the condition for years, referring to a surgeon only when an operation is the right answer. It is a collaboration, not a rivalry — in Singapore the two roles work side by side, and Dr. Chang refers to and receives referrals from vascular surgeons regularly.

What ABVM Certification Is

The American Board of Vascular Medicine (ABVM) certifies physicians who practise vascular and endovascular medicine at an advanced level. It was established by the Society for Vascular Medicine in the mid-2000s and is now administered by the Alliance for Physician Certification & Advancement under Inteleos.

There are two tracks: Vascular Medicine and Endovascular Medicine. The examination tests the full breadth of the field — arterial, venous and lymphatic disease, non-invasive vascular laboratory testing, and the medical management of thrombosis and atherosclerosis. It is open to doctors coming from internal medicine, cardiology, vascular surgery or interventional radiology. In Singapore, where there is no local vascular medicine board to sit, ABVM is the recognised marker that a physician has been formally examined in this specific discipline.

The Journey: Training for a Specialty Singapore Does Not List

Dr. Chang's route into vascular medicine was deliberately long. After medical school at the University of Hawai'i, he completed an Internal Medicine residency at Kaiser Permanente in San Francisco, then cardiology training at the National University Hospital here in Singapore. Recognising that arterial and venous problems were being managed in fragments, he returned to the United States for a dedicated Vascular Medicine Fellowship at Stanford, followed by a Peripheral Endovascular Fellowship at National Taiwan University Hospital to add the catheter skills.

He is board certified by the American Board of Internal Medicine and the American Board of Vascular Medicine, and is a Fellow of the American College of Cardiology and the European Society of Cardiology and a member of the Academy of Medicine, Singapore. The point of assembling that particular combination was to be able to see a patient's heart and their whole vascular system as one problem, which is how they actually behave.

When You Would Want to See One in Singapore

A vascular medicine specialist is the right first stop when the problem is circulatory but not obviously surgical. Consider a referral, or book directly, if you have:

Cramping calf or thigh pain that comes on walking a set distance and eases with rest, or a foot that is cold, pale or slow to heal
A painful, swollen calf, or a past DVT or pulmonary embolism and questions about how long to stay on blood thinners
Varicose veins with aching, swelling, itching or skin discolouration around the ankle
Leg or arm swelling with no clear cause, or diagnosed lymphoedema
Colour changes in the fingers or toes in the cold (Raynaud's), or a small aneurysm picked up on a scan that needs monitoring rather than surgery

What to Expect at the Clinic

At our clinic at Paragon Medical Centre on Orchard Road, a first visit with a vascular medicine specialist usually combines a consultation with a bedside handheld Doppler and, where needed, a formal duplex ultrasound in the same appointment, so you leave with findings rather than just a list of tests to arrange.

As a rough guide, a first consultation runs about SGD 150 to SGD 350, and a duplex ultrasound scan about SGD 250 to SGD 450. You do not need a GP referral to see a specialist privately in Singapore, though a referral letter and any previous scan reports are useful to bring. Medisave and most insurers cover investigation and treatment when there is a clinical indication. The working principle is simple: medication, compression, risk-factor control and keyhole procedures first, and an operation only when one is genuinely the best option.

Frequently Asked Questions

Common Questions About Vascular Medicine Specialist

What is a vascular medicine specialist?

A physician who diagnoses and manages diseases of the arteries, veins and lymphatic vessels without open surgery. The work covers peripheral artery disease, deep vein thrombosis, varicose veins, leg swelling, Raynaud's and clotting disorders, using medication, compression, exercise programmes and minimally invasive procedures. In many countries the same doctor is called an angiologist.

What is the difference between a vascular medicine specialist and a vascular surgeon?

A vascular medicine specialist does not perform open operations; a vascular surgeon does, including bypass grafts, open aneurysm repair and carotid endarterectomy. Both assess circulation, prescribe blood thinners and statins, and can perform angioplasty and stenting. The physician is often the first and long-term doctor, referring to a surgeon only when an operation is needed.

Is an angiologist the same as a vascular medicine specialist?

Yes. Angiology and vascular medicine are synonyms, and which term is used depends on the country. A phlebologist is more specific again, dealing only with venous disease such as varicose veins and leg ulcers. All three work within the same field; the difference is how broad their practice is.

Do I need a referral to see a vascular specialist in Singapore?

No. You can book directly with a vascular medicine specialist or vascular surgeon privately in Singapore without a GP referral. Bringing a referral letter and any previous ultrasound or scan reports is still helpful, and Medisave or insurance can usually be applied when there is a clinical reason for investigation.

Which doctor should I see for varicose veins in Singapore?

For varicose veins that ache, swell or cause skin changes, a vascular medicine specialist or phlebologist is the right first stop. They will arrange a standing duplex ultrasound to map the faulty veins and treat most cases with keyhole methods such as endovenous ablation. A vascular surgeon is involved only if open surgery is required.

What is ABVM certification?

ABVM is certification from the American Board of Vascular Medicine, showing a physician has been formally examined in vascular and endovascular medicine at an advanced level. It covers arterial, venous and lymphatic disease and non-invasive vascular testing. It was established by the Society for Vascular Medicine and is administered under Inteleos.