in guideline Constitutional Symptom Quality of Life Related SCD Symptoms and Complications Fatigue Fatigable Use the literature cited here to link to other phenotypes. Not relevant to context of sickle cell Fatigability Inability to function due to tiredness related to sickle cell disease. Lassitude Tiredness Recommendations for the Management of Sickle Cell Disease in South Africa A Parental Guide to Managing Sickle Cell Disease Standards for Clinical Care of Adults with Sickle Cell Disease in the UK Consensus Statement on the Care of Patients with Sickle Cell Disease in Canada Sickle Cell Disease in Children, Standards and Guidelines for Clinic Care Evidence-Based Management of Sickle Cell Disease