3711
Laboratory variables of renal function [ serum creatinine , blood urea nitrogen ( BUN ) and electrolytes ] were evaluated before initiation of therapy and every 2 days , until termination of the study ( a period of at least 6 days ) .
 Chemical: creatinine; Chemical: blood urea nitrogen; Chemical: BUN
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Disease, Chemical 
Text: {0} 
Answer:
 Chemical: creatinine; Chemical: blood urea nitrogen; Chemical: BUN