A 100-gram serving of raw spinach contains 2.71 mg of iron, whereas cooked spinach contains 3.57 mg. Keep in mind that iron absorption is influenced by how much iron you already have in your body and by other nutrients that you eat with your meals.
Cardiac catheterization is an invasive test performed by a cardiologist, where a catheter is threaded into the coronary arteries (those arteries that supply the heart muscle with blood) through the femoral artery in the groin, the radial artery in the wrist, or the brachial artery in the elbow.
Some of the first tests you may undergo include: 1  Electrocardiogram (ECG). This test records the electrical activity of your heart through electrodes attached to your skin. 2  Blood tests. Your doctor may order blood tests to check for increased levels of certain enzymes normally found in heart muscle. 3  Chest X-ray.