Minor hair loss is a normal part of the hair-growing cycle. Each hair lives about 4.5 years, falls out and is replaced in about six months. If your hair is falling out in clumps, certain lifestyle practices or changes may be to blame, but consult a physician to rule out underlying medical conditions.
Blood draw: Removal of blood, usually by venipuncture (phlebotomy, venous blood sampling). Common term for blood sampling for laboratory analysis.
A blood test measures alcohol or drugs in the blood at the time the blood is drawn. Blood tests are not used as frequently as urine drug tests, because, unlike urinalysis, a blood test does not measure drug residues that remain in the body after the effects of the drug have worn off.