Manganese, Plasma

Manganese is a mineral your body needs in very small amounts to keep enzymes working properly, support bone health, and protect cells from damage. This blood test measures how much manganese is circulating in your plasma. While too little manganese is uncommon in people who eat a normal diet, too much—from workplace exposure, certain medical treatments like IV nutrition, or liver problems—can be harmful, particularly to the nervous system. High manganese levels over time can affect brain function, causing movement and mood changes. Your doctor uses this test alongside your symptoms and other information to evaluate whether your manganese levels are in a safe range.

When elevated: Elevated plasma manganese may indicate occupational or environmental overexposure, excessive manganese supplementation via parenteral nutrition or oral supplements, or impaired hepatic clearance due to liver disease (including cirrhosis and portosystemic shunting). Persistently elevated levels raise concern for neurotoxicity risk, particularly basal ganglia dysfunction. When low: Low plasma manganese is rarely clinically significant in otherwise healthy individuals given the ubiquity of manganese in food. Severely low levels may theoretically contribute to impaired enzyme function, bone abnormalities, or glucose intolerance, but isolated dietary manganese deficiency has not been well-documented in free-living humans.

Plasma manganese is not a standard performance or recovery marker for athletes. However, adequate manganese supports bone health, antioxidant defense (via MnSOD), and energy metabolism—all relevant to training adaptation. It may be worth checking if you have occupational exposure to manganese dust or use high-dose supplements, as excess accumulation can impair neuromuscular function.