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
