In high-temperature conditions, how does blood draw volume typically change?

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In high temperatures, you lose a lot of fluid through sweating, which reduces circulating plasma volume and overall blood volume. With less fluid in the vessels, there is less blood available to draw, so the typical volume obtainable for a phlebotomy sample decreases. The blood also becomes more concentrated (hemoconcentration) as plasma is lost, reinforcing the decrease in draw volume. Increased draw volume isn’t expected here because fluid loss lowers intravascular volume, and saying it’s variable or cannot be determined ignores this predictable effect.