What Is a Cortisol Test? A cortisol test measures the level of cortisol in your blood, urine or saliva. Cortisol is a hormone that's important throughout the body for maintaining blood pressure, blood ...

A cortisol test involves taking a small sample of blood to measure the level of cortisol in a person’s body. Cortisol is a hormone that plays a vital role in the body’s response to stress. If the ...

A BUN test measures the level of urea nitrogen in the blood using a standard blood sample. Abnormal BUN levels may indicate problems with liver or kidney functioning. BUN stands for blood urea ...

Characterizing electronic devices such as field-effect transistors (FETs) and carbon nanotubes (CNTs) can be a challenge because it requires making measurements of very low currents, often at or below ...

You may need a blood gas (ABG) test to measure the amount of oxygen and carbon dioxide in the blood. It may also be used to determine the pH of the blood, or how acidic it is. A blood gas test ...

What Is Prostate-Specific Antigen? Your prostate is a gland that makes seminal fluid, which nourishes and transports your sperm when you ejaculate. It's about the size of a walnut and surrounds your ...