The lab received a stool sample that was obviously bloody and contained many blood clots.When lab staff member tested this sample for occult blood the result initially was negative for blood even though the internal qc on the hemoccult card worked.The staff member knew something was wrong and opened a new developer bottle on 1/12 and retested patient sample that was positive for blood, result was released to patient emr.We did some experimentation and repeated the same bloody stool sample from yesterday with the reagent just opened yesterday, and today the result is very weak positive.There seems to clearly be a stability or degradation issue even though reagents do not outdate for some time.
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