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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.

Psoriatic arthritis is a rare form of arthritis or joint inflammation that affects skin and joints. Read on to learn about this condition in children.

There are many reasons why a child would feel anxious and not want to go to school. Read on to learn more about school refusal.

Failure to thrive (FTT) is slow physical development in a baby or child. It's caused by a baby or child not having enough nutrition.

Eye disorders in children are either refractive or nonrefractive errors. Refractive errors are caused by the shape of the eye. Nonrefractive errors are caused by disease.

Blood is the life-maintaining fluid that circulates through the entire body. Learn about the components of blood.

A baby may have the blood type and Rh factor of either parent, or a combination of both parents.

During pregnancy, the fetal lungs are not used for breathing - the placenta does the work of exchanging oxygen and carbon dioxide through the mother's circulation. With the first breaths of air the baby takes at birth, the fetal circulation changes.