Distribution in body fluids

Concentrations in healthy adults
Blood plasma 0.96; 0.57-1.79
Liqour cerebrosp. 5.8; 3.2 - 12.5
Urine 0.095; 0.033 - 0.29
Saliva 1.8; 0.36 - 4-8
Seminal plasma 51.0; 41.2 - 61.8
Amniotic fluid 1.0; 0.8 - 1.4
Tears 2.4; 1.3 - 7.4
Milk 3.4; 2.2 - 3.9
(mg/L; mean; range)

(AO Grubb; Adv. Clin. Chem. 2001; 35: 63-99)