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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.

SIADH is when the body makes too much antidiuretic hormone (ADH). This is a hormone that normally helps the kidneys conserve the correct amount of water in the body. SIADH causes the body to retain water. This lowers the level of sodium in the blood. SIADH is rare. It most often happens to children who are in the hospital.

Diabetes insipidus is a condition caused by not enough antidiuretic hormone (ADH) in the body. ADH is also known as vasopressin. This is a hormone that helps the kidneys keep the correct amount of water in the body. The condition is also called “water diabetes.”

Hyperparathyroidism is when the parathyroid glands make too much parathyroid hormone. The condition is rare in children.

You can prevent the flu this season by taking one simple step: Get a flu shot.

This test measures the amount of a substance in your body that helps new blood vessels form. The test can help keep track of cancer treatment.

Detailed information on translocation Down syndrome

Genetic testing can help find diseases that run in a family or don't yet have symptoms.

Detailed information on x-linked dominant inheritance.