Most adults carry about 4.5–5.5 liters of blood, with body size, sex, pregnancy, and fitness shifting that range.

Most periods release 2–3 tablespoons (30–45 mL) of blood, and up to 80 mL per cycle can still fall within the usual clinical range.

Most adults carry 4.5–5.5 liters of blood, with weight, sex, and pregnancy shifting the number.

Most adults carry about 4.5–5.5 liters (roughly 1.2–1.5 gallons) of blood, with body size and sex shifting the total.

Most adults carry 4.5–5.5 liters (9–12 pints) of blood, with body size and sex shifting the range.

A standard donation-sized unit holds about 450–500 mL of whole blood, while a transfusion unit of red cells is often nearer 250–350 mL.

Most adult transfusions start with 1 unit of red cells, often around 225–350 mL of packed cells, plus a small IV flush.

Most people lose about 2–3 tablespoons (30–45 mL) of blood per cycle, while bleeding over 80 mL is often treated as heavy.

Most transfusions give 250–400 mL per unit of red cells, while a full “transfusion” may include more units or other parts like plasma or platelets.

Most adults carry 4.5–5.5 liters of blood, with body size, sex, and pregnancy shifting the total.