Most adults carry about 4.5–5.5 liters of blood, with the total shifting mainly with body size, pregnancy, and training level.

A standard whole-blood donation collects about 1 pint (470–500 mL), plus a few small tubes for lab testing.

Most adults carry about 1.2–1.6 US gallons (4.5–6.0 liters) of blood, with the exact amount tied to body size and life stage.

Most periods involve roughly 2–3 tablespoons of blood, and flow that soaks a pad or tampon every hour for hours is not typical.

Plasma makes up about 55% of adult blood by volume, with the rest made up of red cells, white cells, and platelets.

Most periods involve about 30–40 mL of blood; bleeding over 80 mL per cycle or soaking a pad hourly for hours can point to heavy flow.

Most dogs show light-to-moderate spotting for 7–10 days, fading from red to pink, then tapering off.

A standard CBC usually uses one lavender-top EDTA tube, often filled around 2–4 mL, while infants may use 0.5–1 mL microtubes.

A standard whole-blood donation removes about one pint (around 470 mL) from your body, plus a few small sample tubes for testing.

A standard whole blood donation collects around 450–470 mL (just under a pint), plus a few small tubes for lab tests.