Final answer:
Low hemoglobin, hematocrit, and RBC levels may indicate lead poisoning, with hemoglobin being a crucial component affected, leading to anemia and associated symptoms.
Step-by-step explanation:
Low values that may indicate lead poisoning include decreases in several components of the blood such as hemoglobin, hematocrit, and RBC (red blood cells). Among these, hemoglobin is a critical component as it is the oxygen-carrying compound in erythrocytes. Lead poisoning can result in anemia, a condition characterized by a deficiency in the number of RBCs or the amount of hemoglobin, which ultimately leads to lower levels of oxygen being delivered to body tissues. Symptoms of lead poisoning can include fatigue, lethargy, and an increased risk for infection due to the oxygen deficit in various body tissues including the brain.