50.1 MB (50.0 MB compressed)
5130 x 3413 pixels
43.4 x 29.0 cm ⏐ 17.1 x 11.4 in (300dpi)
DR P. MARAZZI / SCIENCE PHOTO LIBRARY DR P. MARAZZI / SCIENCE PHOTO LIBRARY
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Drop of blood from a fingertip is placed on the diagnostic strip of a CoaguChek monitor used to test for blood clotting in an International Normalized Ratio (INR) test. The anti-coagulant drug warfarin was being monitored in this patient by the level of prothrombin in the blood.
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