Nitric Oxide in Plasma (by Chemical Luminescence)

What Does This Test Measure?

Nitric oxide is produced by cells in your body, primarily in the lining of blood vessels. It helps relax blood vessel walls, improving blood flow and maintaining healthy circulation. This test measures the concentration of nitric oxide in your plasma, which can reflect your body’s ability to produce and use this chemical.

Why Might This Test Be Ordered?

A doctor may order this test if you have symptoms or risk factors related to poor circulation, such as high blood pressure, heart disease, or conditions affecting blood vessel function. It may also be part of a broader evaluation for vascular health or certain inflammatory or autoimmune conditions.

Sample Collection and Preparation

For this test, a small amount of blood is drawn from a vein in your arm. The blood is processed to separate the plasma, which is then analyzed for nitric oxide levels. This process typically takes a few minutes, and you may feel a brief pinch during the draw.

What to Expect Before the Test

No special preparation is usually needed, but you may be asked to avoid certain medications or supplements that could affect nitric oxide levels, such as some blood pressure medications or herbal supplements. Always inform your healthcare provider about all medications you are taking.