An overnight stay is generally needed for treatment to be considered inpatient, while an outpatient visit does not require this. Extended time and continuous care is the big difference between the two. If you are admitted to a hospital or other inpatient facility, you will spend at least one night, sometimes more depending on your condition, receiving inpatient care. Outpatient care, which does not require a hospital stay, varies greatly. The term "outpatient" can be applied to almost anything other than an annual checkup or blood test. Procedures, diagnostic tests, or treatments may be included. Hospitals, walk-in clinics, outpatient surgery centers, and your doctor's office may provide outpatient care.