SATURN STILLS / SCIENCE PHOTO LIBRARY SATURN STILLS / SCIENCE PHOTO LIBRARY
Blood sampling. Gloved hands of a doctor using a syringe to take a blood sample from the arm of a pregnant woman. The syringe contains a vacutainer, a small test tube which sucks in the blood once the vein has been pierced. Blood samples such as this can be tested to provide medical information on nutrition, hormone balance, or blood toxin levels. They can also be used in the diagnosis of disease.
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