An association football (soccer) match is presided over by a referee, whom the Laws of the Game give full authority to enforce the Laws of the Game in connection with the match to which he has been appointed (Law 5). The referee is oftentimes assisted by two assistant referees, and sometimes by a fourth official.
Barfoed's test. Barfoed's test is a chemical test used for detecting the presence of monosaccharides. It is based on the reduction of copper(II) acetate to copper(I) oxide (Cu2O), which forms a brick-red precipitate.
GFR is a calculation that determines how well the kidneys are filtering the blood. GFR detects stages of chronic kidney disease. A GFR under 60 may indicate kidney disease. The lower the GFR, the less the kidneys are functioning, states WebMD. Another test that determines kidney function is urine albumin.