Molybdenum, Serum or Plasma

Molybdenum is a trace mineral your body needs in very small amounts to help enzymes process sulfur-containing compounds and break down purines. Most people get enough molybdenum from a normal diet, and true deficiency is very rare. This blood test is mainly used to check for too much molybdenum from workplace or environmental exposure, or to evaluate patients who have been on intravenous nutrition for a long time. Having too much molybdenum can interfere with how your body uses copper, while having too little can affect certain enzyme functions. Your doctor will interpret this result alongside your medical history and other tests.

When elevated: Elevated serum molybdenum may indicate excessive dietary intake, occupational or environmental exposure, or supplementation excess. High levels can interfere with copper metabolism, potentially causing secondary copper deficiency with associated anemia, bone abnormalities, and neurological effects. Gout-like symptoms have been reported in populations with very high molybdenum intake due to increased uric acid production via xanthine oxidase stimulation. When low: Low serum molybdenum is associated with impaired function of molybdoenzymes, particularly sulfite oxidase, which can result in accumulation of toxic sulfite and sulfur-containing metabolites. Clinical manifestations of severe deficiency include neurological deterioration, tachycardia, tachypnea, and altered mental status, as documented in TPN-dependent patients. Molybdenum cofactor deficiency (a rare genetic disorder) presents with severe neurological disease in neonates and is distinct from nutritional deficiency.

Molybdenum is not a primary performance or recovery marker for most athletes. However, it supports purine metabolism and antioxidant enzyme function, which may have minor relevance to intense training; deficiency is extremely rare in Western diets and would not typically limit athletic performance.