CC STUDIO / SCIENCE PHOTO LIBRARY CC STUDIO / SCIENCE PHOTO LIBRARY
Blood sampling. General practice (GP) doctor with a sample of blood taken from a man's arm. The venous blood was obtained using a syringe (venepuncture). The green strap around the patient's upper arm is a tourniquet. This restricts blood flow out of the arm, making veins stand up so that they are easier to puncture. Blood samples are subjected to a battery of tests in modern hospitals, helping to confirm diagnoses or identify disorders. The doctor is wearing rubber gloves to maintain sterile conditions.
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