Quick answer. An angiogram is an imaging test that shows how blood flows through your arteries and is most often used to look for narrowed or blocked heart (coronary) arteries. In Singapore it is usually ordered by a cardiologist when chest pain or other findings suggest coronary artery disease.
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An angiogram is a way of seeing inside your blood vessels. By using a contrast dye and either a CT scanner or fine X-ray imaging, a cardiologist can map where blood flows freely and where an artery may be narrowed or blocked. In Singapore the coronary angiogram, which looks at the arteries supplying the heart, is one of the most common forms.
If your doctor has recommended one, it usually means they want a clearer answer than an ECG or treadmill test alone can give. This guide explains the difference between a CT angiogram and an invasive angiogram, what the test detects, what to expect on the day, the risks, and the typical market cost range so you can plan with realistic expectations.
At a glance
| Feature | CT angiogram | Invasive angiogram |
|---|---|---|
| How it is done | Contrast dye injected into a vein, then a CT scan | Thin catheter passed via wrist or groin artery to the heart |
| Invasiveness | Non-invasive, no incision | Minimally invasive, small puncture in an artery |
| Main use | Ruling out disease in lower-risk chest pain | Confirming and treating significant blockages |
| Treatment in same sitting | No, imaging only | Yes, a stent (angioplasty) can often be placed |
| Recovery | Go home shortly after | A few hours of observation, sometimes overnight |
What is an angiogram?
An angiogram (also called angiography) is an imaging test that uses a contrast dye to make blood vessels visible. The dye absorbs X-rays or shows up on a CT scan, so the artery walls and any narrowing stand out clearly. When the test focuses on the arteries that supply the heart muscle, it is called a coronary angiogram.
There are two main types in Singapore. A CT coronary angiogram is non-invasive: dye is injected into a vein in your arm and a CT scanner takes detailed pictures of the heart arteries. An invasive coronary angiogram involves passing a fine, flexible tube (a catheter) through an artery in the wrist or groin up to the heart, where dye is released and live X-ray images are taken. The invasive test is more detailed and allows treatment, such as placing a stent, during the same procedure.
Why a cardiologist may order one
A cardiologist generally recommends an angiogram when there is a reasonable suspicion of coronary artery disease (narrowing of the heart arteries) and less detailed tests have not given a clear answer. Common reasons include:
- Chest pain or tightness on exertion that may be angina
- An abnormal ECG, treadmill stress test or stress echocardiogram
- Breathlessness or reduced exercise tolerance with cardiac risk factors
- Assessment after a heart attack or before certain heart surgery
- Unexplained symptoms in someone with strong risk factors such as diabetes, high cholesterol, high blood pressure or a smoking history
The choice between a CT and an invasive angiogram depends on your symptoms and risk level. CT is often used when the main aim is to rule disease out, while the invasive test is preferred when a blockage is likely and may need treating.
What to expect during the test
For a CT coronary angiogram, you may be given medication to slow your heart rate so the images are sharp. A cannula is placed in your arm, contrast dye is injected, and you lie still in the scanner for a few minutes. Most people go home shortly afterwards.
For an invasive coronary angiogram, you are usually awake but given local anaesthetic and a mild sedative. The cardiologist numbs the wrist or groin, inserts the catheter, and guides it to the heart while watching live X-ray images. Dye is released and recordings are taken. The procedure itself often takes around 30 to 60 minutes. Afterwards you rest under observation for a few hours while the puncture site is monitored, and some people stay overnight. You will usually be advised to drink plenty of water to help flush out the dye.
Risks and recovery
Angiograms are generally safe and serious complications are uncommon, but no test is entirely without risk. Possible issues include:
- Bruising, bleeding or soreness at the catheter site
- An allergic reaction to the contrast dye
- Temporary effects on kidney function from the dye, especially if kidneys are already impaired
- Rarely, damage to a blood vessel, an abnormal heart rhythm, or a heart attack or stroke during an invasive procedure
After a CT angiogram most people resume normal activity the same day. After an invasive angiogram you may be advised to avoid heavy lifting and strenuous activity for a few days, particularly if the groin artery was used. Tell your doctor if you develop swelling, increasing pain, fresh bleeding, or feel unwell after going home.
Typical cost in Singapore
Costs vary widely depending on whether the test is done in a public or private setting, the type of angiogram, and whether any treatment (such as a stent) is carried out at the same time. As a general market range, a CT coronary angiogram in Singapore commonly falls somewhere in the region of a few hundred to around two thousand Singapore dollars, while an invasive diagnostic coronary angiogram typically costs more, often running into several thousand dollars. If angioplasty and stenting are performed in the same sitting, the total is considerably higher.
These are broad market ranges only, not a quotation. Always ask the hospital or clinic for a written cost estimate for your specific case. As a hospital-based investigation and procedure, an angiogram may be partly claimable under MediSave and MediShield Life within the applicable limits, and government subsidies apply in the public sector for eligible patients. Confirm coverage with the hospital business office and your insurer before the procedure.
When to see a doctor & which specialist
An angiogram is arranged by a doctor, but you should seek care promptly if you have symptoms that may point to a heart problem. Call 995 or go to the nearest A&E immediately if you have severe or crushing chest pain, chest pain spreading to the arm, jaw or back, sudden breathlessness, fainting, or cold sweats, as these can signal a heart attack.
For chest discomfort on exertion, breathlessness, palpitations, or if you have risk factors and want your heart assessed, see a cardiologist for evaluation. They will decide whether an angiogram or another test is appropriate. You can find a doctor through our directory of cardiologists in Singapore.
Related guides
- Best Cardiology Clinics in Singapore — our editorial shortlist
- cardiology clinics directory
- Heart murmur
- Heart bypass (CABG)
- Vasovagal syncope
- Runny nose
- Tonsillectomy
Sources
Part of our Heart & vascular guides · Browse all health topics