Stock Photo: BLOOD SPECIMEN. BLOOD SPECIMEN Photo essay from hospital. Emergency services. Nurse is sampling the blood of a patient. Use of Monovette®, system of sampling by aspiration and vacuum. Each type of analysis corresponds to a color code. They are then made on ´whole blood´ or after centrigugation, on the supernatant fluid named plasma. Color code on this image : Monovette® EDTA KE/2,7 ml red.