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Mira Mar Vet, your local vet in Albany

What can a simple blood test tell us?

by | Apr 24, 2026 | Latest Monthly Newsletters, Pet Care

Did you know that even basic blood tests can help us to diagnose certain issues in your pet, so that we can treat them more effectively?

Even in simple cases such as tummy upset in a young pet (where we don’t really suspect other organ problems), we may still suggest basic blood tests to check:

PCV/TP

PCV is Packed Cell Volume, which refers to the percentage of blood that is made up by red blood cells, while TP (total protein) refers to blood protein levels.

A decreased PCV can help us identify anaemia (low red blood cell levels), which can occur due to:

  • Blood loss, e.g. if the gut is irritated and bleeding
  • Lack of blood cell production, e.g. from a chronic illness
  • Blood cell destruction, e.g. due to an autoimmune disease or certain types of snakebite

An increased TP can occur due to high levels of inflammation, whereas increased PCV and TP together can occur with “haemoconcentration” associated with dehydration (loss of water from the body).

Glucose levels

Significantly decreased glucose levels can lead to weakness or even seizures, and most commonly occur in:

  • Very young puppies or kittens who are unwell and haven’t been eating
  • Pets with sepsis (severe inflammation in the bloodstream)
  • Pets who have eaten liver-damaging toxins, such as xylitol or sago palm

Mildly increased glucose levels can occur with stress. However, significant increases in glucose suggest potential diabetes.

Electrolyte levels

Electrolytes such as sodium, chloride and potassium can become unbalanced in sick pets, and can then further contribute to them feeling unwell. Electrolyte imbalances most commonly occur due to:

  • Dehydration
  • Significant vomiting and/or diarrhoea
  • Kidney disease

For more information on general health assessment in dogs and cats, consult our knowledgeable team.