Fluid retention increases.

The cause is excess ADH secretion.

Severe hyponatremia results.

Excessive sodium is retained. 

Atrophy of the adrenal cortex

Hypersecretion of the anterior pituitary

Panhypopituitarism

Hormone-active adrenal tumor

Aldosterone

Thyroxine

Cortisol

Norepinephrine

Decreased secretion of releasing hormones by the hypothalamus

Severe and prolonged stress

Decreased synthesis of adrenal hormones

Pituitary ischemia

5% of the circulating blood volume

15-20% of the circulating blood volume

10 % of the circulating blood volume 

iron refractory anemia

megaloblastic anemia

iron deficiency anemia

sickle cell anemia

reticulocytosis

jaundice

splenomegaly

decrease in erythropoietin production

reticulocytosis

erythrocytosis

macrocytosis

hypochromia of erythrocytes

decrease in hemoglobin content in red blood cells

formation of methemoglobin

change in the ratio of the volume of cells and plasma

increase in hemoglobin content in red blood cells

Decrease in circulating blood volume

Space-occupying inhibition of the RBC lineage in the red bone marrow

Suppression of spleen function

Hemorrhagic syndrome