On the four cases I've seen, the serum level was high.

Therefore a serum level taken before 4 hours is not recommended.

Resection is usually associated with a fall in serum levels.

On regular administration, maximum serum levels are attained after three days.

Serum levels should be monitored every three months, and more frequently at the outset.

Serum levels were not elevated over the normal range provided by the manufacturer.

Serum levels above 50 μg/l are associated with side effects.

High serum levels is also associated with cognitive impairment and dementia.

They took blood samples from all the participants to determine serum levels of fatty acids.

The serum level of calcium is closely regulated within a fairly limited range in the human body.