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This blood test measures levels of aldosterone and renin.

This test checks for a current or past infection with the virus that causes fifth disease in children.

This test measures the level of a hormone called progesterone in your blood. You may need this test if you are having trouble getting pregnant.

This test measures the level of prolactin in your blood. The test can help find out if you have a pituitary gland tumor.

This test is one of several that looks at how well your blood clots. Your doctor may use this test to help diagnose a blood clotting disorder.

This test checks for influenza antibodies in a sample of secretions from your nose or throat.

This test quickly checks for signs of the influenza virus in a sample of secretions from your nose or throat.

Thrombin time measures how long the blood's plasma, or the liquid portion of the blood, takes to form a clot.

Fibromyalgia is a condition that causes pain in muscles and soft tissues all over the body. It is an ongoing (chronic) condition. Learn more about this condition, including what causes it, what the symptoms are, how it's diagnosed and treated, and what you can do to support your child who has it.