Laboratory quality control using patients results.
D001774:Blood Chemical Analysis / Q000592:standards*; D002245:Carbon Dioxide / Q000097:blood*; D002712:Chlorides / Q000097:blood*; D006801:Humans; D011188:Potassium / Q000097:blood*; D012964:Sodium / Q000097:blood*; D013223:Statistics as Topic; D013997:Time Factors; D014508:Urea / Q000097:blood*
D002712:Chlorides; D002245:Carbon Dioxide; D014508:Urea; D012964:Sodium; D011188:Potassium