Bruce Abrahamse

Bruce Abrahamse

November 13, 2024

Expert Explains How Simple 20-Second ‘Hand Test’ Can Check if You Have a Heart Blockage

Maintaining optimal heart health is very important for longevity, especially as you grow older. There are many ways to improve your heart health, such as following a healthy diet, exercising regularly, maintaining a healthy weight, and quitting smoking. There are also various symptoms of heart disease that you can keep an eye out for. These include chest pain, shortness of breath, fatigue, and heart palpitations. However, there is also a quick and simple test that you can use to determine if you have a heart blockage, called Allen’s test. 

What is Allen’s Test

doctor touching patient hand
Credit: Pixabay

Allen’s Test is the name given to the procedure used by doctors to evaluate the blood flow to the hands. It is specifically used for assessing the patency of the radial and ulnar arteries. This test helps doctors figure out whether there is adequate circulation in the hand before certain procedures. These procedures include drawing blood or inserting a catheter into the arteries. Allen’s test is particularly useful for detecting any blockages or blood flow issues that could pose potential risks. The test is used to ensure that there is no significant obstruction that could affect circulation in the hand.

How Allen’s Test Works

Allen's Test
Credit: Orthofixar

So, how is the Allen’s Test performed? Well, first the patient has to sit or lie down with their hand open and the palm facing upwards. Then, using their fingers, the examiner will compress the ulnar and radial arteries on the patient’s wrist, temporarily stopping blood flow to the hand. The patient is then asked to make a fist and hold it for a few seconds. This causes the patient’s hand to turn pale due to the lack of blood flow. The examiner then releases one of the arteries while still compressing the other one. The patient’s hand should quickly flush with color as the blood flows back in from the open artery. The same process is then repeated with the other artery. 

The results of the Allen’s Test

child's hand
Credit: Pixabay

The results of Allen’s Test can provide doctors with deep insight into the state of your arteries and blood circulation. According to WebMD, If your palm returns to its normal color quickly, it suggests that blood flow from the tested artery is normal. The duration of time it takes for your hand to regain its natural color is also important to doctors. The result is considered abnormal if the hand takes longer than 15 seconds to return to normal, suggesting artery blockage. An equivocal result, where the hand returns to normal within 5 to 10 seconds, is indicative of a borderline issue. A normal result typically occurs when the hand regains its color in under 5 seconds. If your palm doesn’t return to its normal color or takes too long, this could indicate insufficient blood supply to the hand. 

The Origins of the Allen’s Test

stethoscope
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The Allen test was named after an American physician called Edgar Van Nuys Allen, and was developed in 1942. Dr. Allen was a cardiologist who was renowned for his work in vascular medicine, notably while working at the Mayo Clinic. This simple yet important test has been widely used in clinical settings to help in the prevention of complications during procedures such as arterial line insertions.

Other Tests Used to Check the State of Your Heart 

heart issues
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When it comes to checking your heart health, the Allen’s test is just one tool doctors use. According to the Mayo Clinic, another popular method is the echocardiogram. This method uses sound waves to take detailed pictures of your heart, helping doctors assess its function. This way they can tell how well the valves are working, and whether blood is flowing properly. If the doctors are concerned about blockages or heart function under stress, they may perform a stress test. Cardiac CT scans provide a close-up view of your heart’s structure, helping doctors to spot any potential heart issues. Doctors might additionally order a cardiac MRI or PET scan for a more in-depth look at the blood flow. When combined with the Allen’s test, these methods offer a thorough check-up of your heart, helping catch potential problems early.

The Bottom Line

Credit: Pixabay

Staying proactive about your heart health is essential, and simple tests like the Allen’s Test can be an effective tool in spotting potential blockages early. While it’s just one of many tests used by healthcare professionals, it provides valuable insight into blood flow and circulation, helping you take preventive steps before more serious issues arise. Remember, maintaining a heart-healthy lifestyle with regular exercise, a balanced diet, and routine check-ups can go a long way in protecting your heart for years to come. Don’t hesitate to talk to your doctor if you’re concerned about your heart health—they’re there to help you stay strong and vibrant!

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