Several tests are available to measure manganese in blood, urine, hair, or feces. Because manganese is normally present in our body, some is always found in tissues or fluids.
Normal ranges of manganese levels are about 4–15 μg/L in blood, 1– 8 μg/L in urine, and 0.4–0.85 μg/L in serum (the fluid portion of the blood)