Heart and Blood Conditions

Tetralogy of Fallot Symptoms and Diagnosis

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    • For appointments in Seattle, Bellevue, Everett, Federal Way, Olympia, Tri-Cities and Wenatchee, call 206-987-2515.
    • For appointments in Tacoma and Silverdale, call 253-272-1812.
    • For appointments in Alaska, call 907-339-1945.
    • How to schedule

    If this is a medical emergency, call 911.

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  • Locations +

    • Seattle Children's Main Campus: 206-987-2515
    • Bellevue Clinic and Surgery Center: 425-454-4644
    • Everett: 425-304-6080
    • South Clinic in Federal Way: 253-838-5878
    • Olympia: 360-459-5009
    • South Sound Cardiology Clinics: 253-272-1812
    • Tri-Cities (Richland): 509-946-0976
    • Wenatchee: 509-662-9266
    • Pediatric Cardiology of Alaska: 907-339-1945
    • Seattle Children's doctors provide many cardiac services at regional sites throughout the Pacific Northwest. See our complete list of Heart Center locations.

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    • If you are a provider, fax a New Appointment Request Form (NARF) (PDF) (DOC) to 206-985-3121 or 866-985-3121 (toll-free).
    • No pre-referral work-up is required for most conditions. If you have already done testing such as an EKG, Holter monitor or echocardiogram, please fax this information as well as relevant clinic notes and the NARF to 206-985-3121 or 866-985-3121 (toll-free).
    • Your patient will be seen as quickly as possible by the provider who is the best match for managing the current problem.
    • View our complete Heart Center Referral Information (PDF).

Symptoms of Tetralogy of Fallot

The main effect of tetralogy of Fallot is that there's not as much oxygen in the baby's blood as there should be. A low oxygen level can make the baby's skin, lips and fingernails look blue. This is called cyanosis.

Cyanosis can range from mild to severe, depending on how much oxygen-poor (blue) blood makes it to their lungs and how much goes out to their body. Some babies with this condition do not appear bluish at birth. They may become cyanotic later as their pulmonary stenosis gets worse.

Your baby may also have trouble feeding and failure to thrive.

Some babies with tetralogy of Fallot have episodes called Tet spells, when they suddenly turn bluish and may faint. These spells are serious. Your doctor will talk with you about what do to if this happens to your child.

A Tet spell may be caused by activities that change the pressure in the heart and increase flow of oxygen-poor blood to the body. These may include crying, pooping or kicking the legs after waking up. Tet spells occur most often in babies between 2 and 4 months of age.

Tetralogy of Fallot Diagnosis

To diagnose this condition, your doctor will examine your child and use a stethoscope to listen to their heart. In children with tetralogy of Fallot, doctors almost always hear a heart murmur - the sound of blood moving in the heart in a way that's not normal.

The doctor will ask for details about your child's symptoms, their health history and your family health history.

Your child will also need tests that provide information about how their heart looks and works. These may include blood tests, a chest X-rays or MRI (magnetic resonance imaging) of the heart, echocardiography, electrocardiogram and sometimes cardiac catheterization.

Contact Us

Contact the Heart Center at 206-987-2015 for a cardiac referral, a second opinion or more information.