Functional, orthostatic, postural or transient albuminuria is not an uncommon finding. Most observers of large series report an incidence of 5 per cent,1 although as high as 9.9 per cent2 and even 16 per cent3 have been found. Calvin, Isaacs and Meyer4 have studied the subject in children. They found it more commonly among children who received poor care than among those who had excellent care, 60 per cent in the former, 15 per cent in the latter. They classified their cases as follows: (a) malnutrition albuminuria, usually associated with anemia, a possible cause being focal infection: (b) orthostatic or postural albuminuria, and (c) idiopathic or "growth" albuminuria, including under this head the so-called juvenile, pubertal, cyclic, transitory or intermittent albuminurias.
Fishberg5 has reviewed the literature on the "benign" albuminurias, noting the early observations of Becquerel in 1841, Vogel in 1864 and Sir William Gull
PALMER RS. FUNCTIONAL ALBUMINURIA. JAMA. 1931;96(19):1559-1562. doi:10.1001/jama.1931.02720450001001