Saliva on Hemastix produces false-positive results for blood.
D005189:False Positive Reactions; D006396:Hematemesis / Q000175:diagnosis*; D006801:Humans; D007202:Indicators and Reagents; D011934:Reagent Strips; D012463:Saliva
D007202:Indicators and Reagents; D011934:Reagent Strips