Liberty Analyzer WBC System: Reference Interval Study

Inclusion Criteria: * Aged ≥21 years old at the time of study entry * Able to provide written informed consent Exclusion Criteria: * Inadequate use and understanding of the English language, requiring a translator * Undergone tattooing or body piercing within the 7 days prior to the study visit * Undergone vaccination within the 7 days prior to the study visit * Episode of upper respiratory infection within the 30 days prior to the study visit * Use of oral corticosteroid medications within the 30 days prior to the study visit * Undergone surgery within the 90 days prior to the study visit * Been hospitalised within the 90 days prior to the study visit * Donated blood or plasma within the 90 days prior to the study visit * Pregnant at the time of the study visit * Breastfeeding at the time of the study visit * Current diagnosis of anemia (including iron deficiency anemia, vitamin deficiency anemia, aplastic anemia and/or hemolytic anemia) * Current diagnosis of high blood pressure * Current diagnosis of diabetes mellitus * History or current diagnosis of chronic kidney disease or end-stage renal disease * History or current diagnosis of cancer * History or current diagnosis of cardiovascular disease * History or current use of radiotherapy of the chest or abdomen * History or current diagnosis of the following conditions known to affect the CBC differential count: * Immune Thrombocytopenic Purpura (ITP) * Systemic Lupus Erythematosus (SLE) * Rheumatoid Arthritis (RA) * Antiphospholipid Syndrome (APS) * Sjogren's Syndrome * Tuberculosis (TB) * HIV * Hepatitis B/C * G6PD Deficiency * Sickle Cell Disease/Trait * Inflammatory Bowel Disease (IBD) * Eptein Barr virus * CMV Cytomegalovirus * Myelodysplastic Syndromes (MDS) / CMML * Asplenia Participants who meet the following criteria will be excluded a posteriori: * Hemoglobin, hematocrit, red cell and/or total white blood cell count obtained by standard laboratory analysis of the participant's venous blood sample, that fall(s) outside of the applicable reference interval(s) in use at the study site. * Iron, ferritin, transferrin, total Iron Binding Capacity (TIBC) and/or transferrin saturation results obtained by standard laboratory analysis of the participant's venous blood sample, that fall(s) outside of the applicable reference interval(s) in use at the study site. * Alanine aminotransferase (ALT), aspartate aminotransferase ( AST), alkaline phosphatase (ALP), gamma-glutamyl transferase (GGT), total bilirubin, conjugated bilirubin, albumin and/or total protein results obtained by standard laboratory analysis of the participant's venous blood sample, that fall(s) outside of the applicable reference interval(s) in use at the study site. * Creatinine, estimated glomerular filtration rate (eGFR), blood urea nitrogen (BUN), sodium, potassium, chloride and/or bicarbonate results obtained by standard laboratory analysis of the participant's venous blood sample, that fall(s) outside of the applicable reference interval(s) in use at the study site. * C-reactive protein (CRP) results obtained by standard laboratory analysis of the participant's venous blood sample, that fall outside of the applicable reference interval in use at the study site. * Self-report to be taking medication(s) that are subsequently identified as interfering substances for the Liberty Analyzer WBC System