Target Range. Healthy LDL levels fall within the optimal target range, which is less than 100 mg/dL. If you have a history of heart disease, your target range is under 70 mg/dL. Near optimal is between 100 and 129.Levels between 130 and 159 mg/dL are considered borderline high, while over 160 mg/dL is considered high.arget Range. Healthy LDL levels fall within the optimal target range, which is less than 100 mg/dL. If you have a history of heart disease, your target range is under 70 mg/dL. Near optimal is between 100 and 129.