Abstract
The excretion of selenium in urine was determined in West German healthy volunteers. Women excrete 17.7±4.2 μg Se/d and men 19.0±9.0 μg Se/d. The daily selenium excretion per gram creatinine is 13.5±3.8 μg Se/g crea for women and 9.8±3.3 μg Se/g crea for men. The clearance of selenium from the plasma is calculated with 0.18 mL/min. The selenium excretion per day is positively correlated with the 24h excretion of urea and creatinine. The correlation of the selenium excretion with the urea excretion is most probably owing to the fact that the selenium intake of West Germans is linked primarily to foods with high protein contents. That the selenium excretion is directly correlated with the creatinine excretion is an indicator that the muscle, which accounts for nearly 50% of the whole body selenium in West German adults, influences the selenium excretion in urine. The positive correlation of the selenium excretion with the potassium excretion also indicates that the muscle mass contributes significantly to the selenium excretion in urine. Another indicator that the selenium excretion is influenced by the muscle is that after intensive muscular activity (running), selenium excretion is enhanced. The 24h selenium excretion is dependent on the glomerular filtration rate of the kidney characterized by the creatinine clearance. This result is important, because if the selenium excretion is used as parameter for the selenium status of humans, the kidney function should be known. This is a limitation for the use of the urinary selenium excretion as parameter for the selenium status. This is especially important for patients whose glomerular filtration rate is low. The 24h selenium excretion is further influenced by the 24h urine volume. Selenium losses via urine may be concomitant with protein losses in urine.
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