Which lab test is most indicative that a patient has refeeding syndrome?

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Refeeding syndrome is characterized by the rapid shift of electrolytes and fluids that occurs when a malnourished patient begins receiving nutrition. The most indicative lab test for refeeding syndrome is a serum phosphate level of less than 0.6 mmol/L. Other potential findings include hypokalemia, hypomagnesemia, and hypocalcemia. While a low albumin level (A) or prealbumin level (C) may be seen in malnourished patients, they are not specific to refeeding syndrome. Hemoglobin (B) may be low in anemia, but it is not directly related to refeeding syndrome.

Which Lab Test Is Most Indicative That a Patient Has