Periodically testing the blood may catch this issue before it is too late.

If the result is near a point at which treatment is needed, the person may need to be tested periodically.

The volunteers' blood was tested periodically for fat content after eating.

Agents with access to specific classified material have also been tested periodically, he said.

They should be tested periodically throughout their lives using a complete thyroid "panel".

They're tested periodically by the school district, and they always come through with flying colors.

You should periodically test the seal by putting a few drops of water on the tile in various places.

These participants' happiness scores also increased and continued to increase each time they were tested periodically after the experiment.

Badgers are periodically tested for the disease by the ministry of agriculture.

If you have a private well, you should have your water tested periodically.