My dog has thrombocytopenia and black stools. Why isn't he anemic?
A platelet count of 73 (which is actually 73,000 due to the way machines read this value) is decreased, but that level of thrombocytopenia is not likely to result in "spontaneous" bleeding--meaning he (she?) has enough platelets for his body to go through day to day normal low key activities without bleeding. However, this is a level (73,000) would be a red flag to avoid putting the dog in situations where we CREATE bleeding--ie we would be cautious if a surgery were needed, etc. A 73,000 thrombocytopenia is most likely "consumptive," meaning the platelets are being used up faster than the body can make them. In his case (her case? I don't see it specified) likely due to gastrointestinal bleeding resulting in the black stools. Therefore the body is doing 'ok' at keeping the bleeding under control in terms of preventing anemia, in that the platelets are doing their job. This is why the Hct is still normal. Additionally, and the reason for the comment of "possible slight anemia" is that the Hct will drop when the pet is better hydrated. Think of it like more concentrated iced tea, then you add some more water and its a little less concentrated. The Hct is 44, but once there is more "fluid" portion of the blood, the red blood cells get diluted a bit, so it may be more like in the high 30s (depending on the severity of the dehydration which I cannot gauge without a physical exam. )
I hope that is helpful! Thank you for asking Petco Pet Education Center, formerly Petcoach!
Updated on September 23rd, 2025