Effusion Analysis (Part 2)


Effusion Evaluation:

Haemoabdomen – Ultrasound

Last week we talked about how to determine if your effusion was septic. This week, let’s have a look into further evaluation of effusion samples.

If the effusion is haemorrhagic, here are some things to look out for.

Real or iatrogenic origin:

  • Blood rapidly defibrinates in cavities so if it clots then it is iatrogenic
  • If it swirls during collection it is more likely to be iatrogenic

Is it acute or chronic?

  • Compare PCV/TP to peripheral, if sample PCV/TP = peripheral blood PCV/TP then a recent bleed is most likely the cause
  • Always run a PCV/TP on haemorrhagic effusions don’t always assume it is from a large haemorrhage. Effusions with low PCVs e.g. 5 can look like frank blood!

    Haemoabdomen – PCV Tubes
  • If sample PCV is low but TP is the same as peripheral blood then the bleed is likely chronic
  • If erythrophagocytosis is present then it is chronic, look for macrophages, which contain dark brown to green pigments in your smear
  • Also assess for the presence of clumped platelets, this can mean intravascular sampling or a very acute bleed


These tips should help with evaluating your effusion samples more effectively.

Want to Buy in Bulk?

You can purchase up to 9 copies of the books and veterinary flashcard sets. Up to a maximum of 15 mixed products can be added to the cart. You can save up to 20% by sharing postage costs.

Grab friends and colleagues to organise an order of 10+ of each product, for further bulk discounts.

Email gerardo@minivetguide.com for more info.