The blood test that detects nicotine is called a cotinine test. It measures recent tobacco use and exposure. Cotinine is a chemical that comes from the breakdown of nicotine in the body. A blood test ...

‌Your thyroid is a small butterfly-shaped organ in the front of your neck. It has a lot of important roles, including making hormones that control your metabolism and help your body grow and develop.

The presence of hepatitis B surface antibodies in the blood indicates a person is recovering from a hepatitis B virus infection. It means that their immunity to HBV is increasing. By testing a ...