3 mL (2 mL min.) whole blood from 1 Lavender Top (EDTA) tube. Separate plasma IMMEDIATELY and transfer onto ice. Ship refrigerated or frozen. Avoid hemolysis.
Ammonia results from the metabolism of amino acids. The commonest cause of elevated blood ammonia is severe liver disease. The levels are also elevated in Reye Syndrome, Urea Cycle Enzyme deficiencies and other conditions like urinary tract abnormalities. The correlation with hepatic coma is poor.
No special preparation required. This test is available only at National Reference Lab, Rohini, Delhi and patient to report to this address only.