Systematic error between erythrocyte protoporphyrin in proficiency test samples and patients' samples as measured with two hematofluorometers.
Hematofluorometers manufactured by two different companies (Aviv Biomedical and Environmental Science Associates) performed satisfactorily for protoporphyrin determinations with proficiency test samples but showed about a 30% low bias with actual clinical blood specimens.
D002648:Child; D004912:Erythrocytes / Q000032:analysis*; D005188:False Negative Reactions; D005470:Fluorometry / Q000295:instrumentation; D006801:Humans; D007855:Lead Poisoning / Q000097:blood*; D008722:Methods; D011166:Porphyrins / Q000097:blood* / Q000592:standards*; D011524:Protoporphyrins / Q000097:blood* / Q000592:standards*; D011786:Quality Control; D012015:Reference Standards; D014116:Toxicology
D011166:Porphyrins; D011524:Protoporphyrins; C017803:zinc protoporphyrin; C028025:protoporphyrin IX