Volhard test

Vol·hard test

(fōl'hart),
a test for renal function: the patient drinks 1500 mL of water on an empty stomach; if the patient was not dehydrated beforehand and the kidneys are normal, this fluid will be excreted by the end of 4 hours with specific gravity of the urine ranging from 1.001-1.004.

Volhard,

Franz, German physician, 1872-1950.
Volhard test - for renal function.