Antelope Valley Hospital has been given top honors from HealthGrades, a firm that ranks the quality of medical facilities across the country. For the fifth time in as many years, the Lancaster hospital was given a five-star rating for clinical experience in maternity care. The hospital was also ranked in the top 5 percent of hospitals for maternity care for the third straight year. The rankings of 1,400 hospitals nationwide are based on complication rates with deliveries, in-hospital volume and the number of neonatal mortalities. The 379-bed nonprofit hospital annually delivers more than 5,000 babies.