Cross River Cardiology

Diagnostic Services

Following your heart disease screening, our Caldwell County cardiologist may recommend non-invasive cardiac testing, which is available right in our office. Diagnostic testing may rule out certain heart diseases or indicate the exact cause of your symptoms.

If you are diagnosed with heart disease, Dr. Johnny Dy will talk to you about the options available for management and treatment, including interventional cardiology procedures, if necessary.

Tests performed in our cardiology office include:

Vascular Duplex Ultrasound

Vascular Duplex ultrasound uses both conventional ultrasound and Doppler ultrasound to produce images of blood vessels that shows how blood moves through them. While conventional ultrasound uses sound waves to create pictures of the structure of blood vessels, Doppler ultrasound shows blood movement. In combination, this can give your doctor valuable information about how your blood vessels are working without an invasive procedure.


Echocardiogram is a Doppler ultrasound of the heart that evaluates heart function. Echocardiogram is also referred to as transthoracic echocardiogram (TTE), Doppler ultrasound of the heart, or surface echo. Learn more about echocardiogram.

EKG (Electrocardiogram)

Electrocardiogram (EKG) identifies if the heart is beating normally by measuring the heart's electrical activity. Learn more about EKG.

Nuclear Stress Test

Nuclear stress testing shows images of how the heart pumps blood while it is beating. It measures blood flow to your heart muscle both at rest and during stress on the heart. The images can show areas of low blood flow through the heart and areas of damaged heart muscle that indicate the presence and degree of heart disease.

Routine Treadmill Stress Test

A treadmill stress test evaluates how the heart works during exercise. It is also referred to as an exercise ECG. A treadmill stress test may reveal heart problems not apparent when you are at rest, since the heart pumps faster during physical activity.

Peripheral Vascular Ultrasound

Peripheral vascular ultrasound uses high frequency sound waves to produce images of the peripheral arteries, located in the arms and legs, and show how the blood moves through them. This test can help diagnose peripheral artery disease (PAD).

Cardiac Event Monitor / Holter Monitor

An event or Holter monitor records the heart’s rhythm to help heart doctors diagnose cardiac arrhythmia. The device is worn for a period of time to record the heart's rhythm when you have symptoms.

Pulmonary Function Tests (PFT)

PFTs measure how well your lungs inhale and exhale air, and if they are doing a good job of moving oxygen throughout your body. They are commonly performed by pulmonologists to detect lung disorders, but cardiologists may use PFTs to help detect heart failure.

Diagnostic Tests for Heart Disease in Caldwell County, NC

If you are at risk for heart disease, call Cross River Cardiology at (828) 572-0778 for an appointment today with our Lenoir, NC heart doctor. You may also use our secure online appointment request form.