A small number of RBCs are normally present in urine and usually result in a negative chemical test. An increased amount of hemoglobin and/or increased number of RBCs are detected as a positive chemical test result.
gigahertz. n, pl-hertz. 1. (Units) a unit of frequency equal to 10 9 hertz. Symbol: GHz.
hertz. A unit used to measure the frequency of vibrations and waves. One hertz is equal to one cycle per second. Radio waves are usually measured in megahertz, or millions of hertz.