A test kit for preparing a chemical test pad used in testing for the presence of {HEAD ~ occult blood} in {TAIL ~ a specimen} 
A test kit for preparing a chemical test pad used in testing for the presence of { HEAD ~ occult blood } in { TAIL ~ a specimen }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL