Which suffix indicates a condition related to blood?

The suffix -emia is specifically used in medical terminology to denote a condition related to blood. It originates from the Greek word "haima," meaning blood. Therefore, any term that incorporates this suffix typically refers to a state or condition of the blood, such as anemia (a deficiency of red blood cells) or leukemia (a type of cancer affecting the blood and bone marrow).

The other suffixes serve different purposes: -itis refers to inflammation, -logy indicates the study of a subject, and -osis signifies a condition, usually abnormal, related to a particular process or system. While -osis can apply to various medical conditions, it does not specifically pertain to blood, which is what makes -emia the correct choice in this context.