This test measures the amount of lead in your child's blood. High levels of lead in the blood can be toxic.

This test measures the amount of LDL cholesterol in your blood. It may be done as part of a routine exam for high cholesterol.

This test measures the amount of hydrogen gas in your breath. It can help find out if you are unable to digest milk and other dairy products.

This test tells whether your body is able to break down lactose, a sugar found in milk and other dairy products. If you can't digest lactose, you have lactose intolerance.

This test looks at how much of the enzyme LDH you have in your blood. Higher levels of this substance could mean you've had a heart attack or other tissue damage.

This test measures different isoenzymes in your blood. You may need this test if your health care provider wants to see if you have a blood disorder or tissue damage.

This test measures the amount of an enzyme in your cerebrospinal fluid. The test can help diagnose diseases and conditions that affect your central nervous system.

This test checks your urine for chemicals that might cause your body to form kidney stones.

This test checks the amount of ketones you have in your body. People with diabetes may have high levels of ketones.

This test measures ketones, a byproduct of digestion, in your blood. A high level of ketones is a potentially fatal complication of diabetes.