Well, you'll have to admit that they are getting more sophisticated, aren't they? <G> It's the role of the CDI specialist and the coder to only seek documentation help when the situation truly deserves it. As I always tell my students, don't ask the question until you already know the answer.
If a patient has an operative procedure that involves little blood loss or has documented in the Anesthesiologist's report a low number for EBL, then there was not hemorrhage per se. Anesthesiologists maintain blood pressure with crystalloid. But why is there necessity to use large volumes of crystalloid? Some anesthetic agents cause blockage of the nerve impulses to the arteries and that leads to "relative" hypovolemia - so they have to push volume into the patients. Some patients go into the surgery with autonomic nerve dysfunction, as may happen with diabetics. These people often manifest drops in blood pressure due to nerve dysfunction of their own, so they need boluses or higher flow to maintain BP. These folks will come out of surgery with a lower hemoglobin - due to dilution.
Realize two things. First, if the drop in hemoglobin doesn't reach the level to consider it "anemia," it's NOT ANEMIA. Secondly, some procedures are associated with insignificant blood loss from the operation but the reason to do the surgery may have been associated with a LOT of blood loss (bleed from angiodysplasia of the bowel, fracture of the femur, etc.) These folks will have anemia due to acute blood loss but it's not surgical blood loss.
When the RACs are right, go with it and learn. When they're wrong, defend your case. Look at your cases and only work with the docs when it's really there.
The answer to your question as posed is "no." You can't tell from indices at all. You need to look at the case.