• Tenwek Hospital Laboratory is made up of an inpatient facility and outpatient lab. The outpatient lab is open from 7:30AM to 7PM seven days a week. The inpatient lab is open 24/7. For outpatients looking for external diagnostics, please go to registration, then go to the laboratory to have your tests ordered. You will then need to go to billing to pay for your tests before samples and analysis will be done. Test result printouts are available