Hay test

Hay test

(hā test)
Sulfur is added to urine; test result is positive for bile salts if sulfur sinks to the bottom of sample.
References in periodicals archive ?
"Consider having the hay tested to determine if you need to supplement during times of possible cold stress, especially for the enduring cold spells."
Gary Hay tested Marc Bell in the home goal and Owen Story spearheaded a good move which had the Spartans' defence stretched, but generally Blyth's depleted side coped admirably with all Redditch produced.
Chris Hay tested Allan Ferguson with a stinging right foot shot from a tight angle inside two minutes.