A giant retailer is trying to throw its clout into cutting the cost and increasing the convenience of receiving routine medical care.

Wal-Mart Stores Inc., Bentonville, Ark., says it hopes to work with outside companies, such as RediClinic L.L.C., Houston, to open about 400 in-store clinics by 2010.

Wal-Mart expects to open in-store clinics in Atlanta, Dallas and Little Rock, Ark., in April.

The clinics, which will serve adults and children over age 2, will provide health screenings, vaccinations, basic physical examinations and treatment of common ailments, such as sore throats and bladder infections, Wal-Mart says.

All clinics will use the same standard electronic medical record system, Wal-Mart reports.