Thiamine

Thiamine (vitamin B1) is essential for energy metabolism and nervous system function. This test measures thiamine status in the blood to identify deficiency. Thiamine deficiency causes weakness, nerve damage, and can lead to serious conditions like Wernicke-Korsakoff syndrome, particularly in people with alcohol use disorder, malnutrition, or certain genetic conditions. Symptoms of deficiency include fatigue, neuropathy (nerve pain), and cognitive problems. Testing is ordered when deficiency is suspected based on symptoms or risk factors.