The basis for this estimate is a chemical in the blood called creatinine.

Some children with polyarticular disease have a special kind of antibody in their blood called rheumatoid factor.

Paul crouched at the ready and, as he had been trained to do after first blood, called out: "Do you yield?"

Allergy blood tests look for substances in the blood called antibodies.

Scabs were made by things in your blood called corpuscles.

The development of 714-X was based on the theory that there are tiny living things in the blood called somatids.

But Saala was a woman, with a woman's curiosity, and blood called to blood.

The main function of iron is to form the red pigment in the blood called haemoglobin.

But Light was her sister, her blood, and blood called to blood.

This test measures levels of a chemical in the blood called CA-125.