Cryoglobulin

This test is done to find out if you have abnormal proteins in your blood. They can be a sign of rheumatoid arthritis, lupus, or Raynaud's syndrome, among other illnesses.

Clonazepam Level (Blood)

This test measures the amount of clonazepam in your blood. Clonazepam is a medicine used to treat seizures.

Clinical Genetic Testing

This screening test looks for inherited diseases or genes that put you at risk for a certain disease.

Chromosome Analysis

This test looks for changes, or abnormalities, in the chromosomes that make up your body's DNA, or genetic road map.

Creatine Kinase (Blood)

This test measures the amount of a protein called creatine kinase (CK) in your blood. Levels of CK can rise after a heart attack or skeletal muscle injury.

Cortisol (Urine)

This test looks for two fairly uncommon health conditions: Cushing syndrome and Addison disease. It also may be used to diagnose other diseases that affect your pituitary and adrenal glands.

Chloride

This test will find out how much chloride is in your blood and help your health care provider find out if you have a kidney problem.