Hemoglobin Variant Test Hemoglobin S Test http://www.questdiagnostics.com/testcenter/TestDetail.action?ntc=31852 SCDO (Clair Ingram) Few but definitions not freely available Sickle Cell Identification Hemoglobin S Measurement In SNOMED CT this term is "Sickle cell identification". Request inclusion into relevant ontology. A test to quantify the presence of hemoglobin S in the blood and therefore determine whether a person has sickle cell trait or sickle cell disease.