Final answer:
A hemoglobinometer is the instrument used to assess anemia, measuring the concentration of hemoglobin in the blood. It is distinct from devices that measure blood pressure, blood cell count, lung function, or oxygen saturation.
Step-by-step explanation:
An instrument used to assess anemia is a hemoglobinometer. This device measures the concentration of hemoglobin in a blood sample. Anemia is characterized by having lower than normal levels of hemoglobin, which is critical for transporting oxygen in the blood. It's important not to confuse a hemoglobinometer with other devices such as a sphygmomanometer (which measures blood pressure), a haemocytometer (which counts blood cells), or a spirometer (which measures lung function). A related device is the pulse oximeter, which measures oxygen saturation in the blood, providing insight into respiratory functions and overall oxygenation levels; however, this device is not used primarily to diagnose anemia.