A manganese blood test is a laboratory test that measures the level of manganese in the blood. Manganese is a trace element that is essential for the proper functioning of the body. It is involved in the metabolism of carbohydrates and amino acids, the production of collagen and elastin, and the synthesis of hormones and neurotransmitters. The manganese blood test is used to evaluate manganese levels in the body and to help diagnose and monitor conditions that can affect manganese levels, such as manganese deficiency or manganese toxicity. The test is typically done by drawing a small amount of blood from a vein in the arm and sending it to a laboratory for analysis. Abnormal results on a manganese blood test may indicate a deficiency or excess of manganese in the body and may require further evaluation and treatment.