Complement component 3, often called C3, is an essential protein of the immune system. This protein plays a vital role in the body’s innate immune system, providing the first line of defense against ...

If your doctor thinks you might have lupus, they may ask you to take blood tests to check for antibodies in your blood. The most common antibody test is called the antinuclear antibody (ANA) test.

Bicarbonate is a form of carbon dioxide (CO2), a gas waste left when your body burns food for energy. Bicarbonate belongs to a group of electrolytes, which help keep your body hydrated and make sure ...

Will Kenton is an expert on the economy and investing laws and regulations. He previously held senior editorial roles at Investopedia and Kapitall Wire and holds a MA in Economics from The New School ...

Adam Hayes, Ph.D., CFA, is a financial writer with 15+ years Wall Street experience as a derivatives trader. Besides his extensive derivative trading expertise, Adam is an expert in economics and ...

How well do you understand the world of words? Verbal ability includes the capacity to reason using language, and to use words appropriately and in context. This test measures some of these abilities.

Chronic fatigue, unexplained weight loss or gain, infertility, and hair loss can all signal a hormonal imbalance. You might consider a hormone test if you’re experiencing these or more. Hormone tests ...

“Know thyself” is a great rule of thumb. If you’d like to explore your personality traits, assess possible symptoms of a mental health condition, evaluate your conflict style, romantic impulses or ...