How high is considered elevated for calcitonin levels?

Procalcitonin levels higher than 2 μg/L are considered elevated.

Under normal circumstances, the reference range for procalcitonin is less than 0.5 μg/L, and it is primarily used as an indicator to reflect the degree of systemic inflammation. If the procalcitonin level is below 0.5 μg/L, this is considered normal, suggesting that there is no severe infection in the body. However, if the level exceeds 2 μg/L, it is considered high, indicating a potentially serious bacterial infection and reflecting disease severity. As the condition gradually comes under control, procalcitonin concentrations typically return to normal levels.

Patients are advised to undergo further examinations to determine the exact underlying cause, and appropriate treatment plans should be established by a physician for timely intervention.