SAPMLE USE TO CARRY OUT THE TEST
SPECIMEN: whole blood can be used to perform blood urea nitrogen. Since whole blood can be used, then EDTA container can be use to collect the sample.
But sodium fluoride should not be used because it an enzyme inhibitor.
And ammonium oxalate should not be used because there are other method which estimate blood urea with used of ammonia.
Their three methods used to estimate blood urea, but we are using berthelet method.