hi, thankyou for answering my question. I expectorated about a teaspoonful of bright red blood out of my upper throat. The apparent rupture sealed quickly, and there was no blood in subsequent attempts to expectorate. I had repeated infections in my throat when I was young but now at age 64 I have been relatively healthy. I am wondering if the expectorated blood would contain cells which could be tested for abnormal cells? because I saved the material (I know, yuck) Thank you, Cheryl B