By The Pawline veterinary teamVeterinary-reviewed by Alastair Greenway, BVM&S MRCVS · 9 August 2026
Reference range · %Dogs
0.140.46
Reference
0.14–0.46
Direction
Both unusually high and low values carry meaning.
This is the conventional reference interval. Your pet’s own report may print a slightly different range, so always read the value against that. Sign in to see your pet’s value on this strip.
Plateletcrit is the proportion of blood volume made up of platelets — the platelet count and the average platelet size combined into one figure. It tracks the platelet count closely, so it is read as supporting detail beside that count rather than as a separate finding.
Plateletcrit answers a slightly different question from the platelet count. The count asks how many; plateletcrit asks how much — what share of the blood's volume the platelets actually occupy. It is the platelet equivalent of the haematocrit, and it is derived from the count and the average size (MPV) rather than measured independently.
Plateletcrit is the share of blood volume made up of platelets — count and average size combined.
What it adds, and what it does not
Because it is built from the count and the size, plateletcrit moves largely with the count: low when platelets are low, high when they are raised. That makes it a reasonable summary of platelet mass, and it is the reason Pawline treats it as supporting texture rather than an independent signal — the platelet count is doing most of the work in the number.
A note on the abbreviation is worth having. On a haematology panel, PCT means plateletcrit. In human medicine the same three letters usually mean procalcitonin, an entirely unrelated inflammatory marker. If you are reading around the subject online, that collision is easy to fall into.
Reading a low result
A low plateletcrit generally reflects a low platelet count, and it is the count — and the reason for it — that matters. Causes of a genuinely low platelet count are varied and include consumption, destruction and reduced production (eClinpath). It is not a number to interpret alone, and a single low reading on an otherwise unremarkable panel is often worth simply repeating.
Reading a high result
A raised plateletcrit usually accompanies a raised platelet count, which in dogs and cats is frequently reactive — a response to inflammation, iron deficiency or recovery from blood loss rather than a primary platelet disorder (eClinpath).
The artefact to know about
Platelets clump readily in a sample tube, and clumping makes the count read falsely low — which drags plateletcrit down with it. This is common enough in cats that feline platelet numbers are treated with caution as a matter of routine, and a smear examined by eye is the usual arbiter (eClinpath).
So a low plateletcrit in a cat with no bleeding and no other abnormality is, more often than not, a question about the sample rather than about the animal.
In chronic disease
Where platelets are being monitored — through treatment that affects the marrow, or while a low count recovers — the platelet count is the figure that is followed. Plateletcrit moves with it and adds little on its own.
Reference ranges reflect conventional laboratory intervals. Always interpret against your own lab's printed range and your veterinary surgeon's judgement. A brighter optimal band is shown only where a published guideline defines one, and it is cited.
This page is educational and is not a diagnosis. Lab results are interpreted in the full clinical context by your veterinary surgeon; a single value rarely tells the whole story.
