Part XXIV — Reading your vet's report

Owners are routinely handed a laboratory report and left to interpret a page of numbers, arrows, and abbreviations. This chapter explains what the common tests look at and why a vet orders them, so that an owner can follow the reasoning and ask better questions. It is a literacy chapter, not a diagnostic one.

Two rules before anything else. First, reference ranges differ between laboratories and between analysers — a value flagged 'high' by one lab may be normal at another, so a result can only be read against the range printed on that report. Second, a number out of range is not a diagnosis. Vets interpret patterns across many values, in the context of the dog in front of them; a single flagged line, read alone, is how owners frighten themselves unnecessarily. Only your vet interprets your dog's results.

24.1 The complete blood count (CBC)

Counts the cells in blood. It is the test that tells a vet whether the dog is anaemic, whether it is fighting infection or inflammation, and whether it can clot.

• Red blood cells, haemoglobin, and packed cell volume (PCV/haematocrit) — the oxygen-carrying capacity. Low means anaemia (see the anaemia entry), which is a sign with many causes, not a diagnosis in itself.
• White blood cells — the immune cells, reported as a total and as a differential between types. The pattern of which types are raised or lowered is far more informative than the total.
• Platelets — needed for clotting. A low count raises the question of immune-mediated destruction or tick-borne disease, both covered in this encyclopedia, and matters urgently before any surgery.
• Blood smear — a person looking down a microscope at the cells. It is how tick-borne parasites are often actually found, and it remains one of the highest-value, lowest-cost tests in veterinary practice.

24.2 The biochemistry panel

Measures substances in the blood that report on how organs are functioning. Values are grouped by what they tell you about.

• Liver markers (such as ALT, ALP, bilirubin) — raised values indicate the liver is irritated, damaged, or congested, or that bile flow is obstructed. They indicate liver INVOLVEMENT, not a specific liver disease.
• Kidney markers (urea/BUN, creatinine, and increasingly SDMA) — these rise as kidney function falls, and are read together with the urine concentration, because a kidney value is close to meaningless without knowing how dilute the urine is.
• Glucose — high raises the question of diabetes; low is an urgent finding in a puppy or a small dog.
• Total protein and albumin — nutrition, hydration, liver production, and losses through the gut or kidney.
• Electrolytes (sodium, potassium, chloride) — hydration and, in particular patterns, adrenal disease. Potassium is one of the few values that can itself be immediately life-threatening.
• Pancreatic markers — for pancreatitis, which is common, painful, and easily missed.

24.3 Urinalysis

• Concentration (specific gravity) — the single most useful line on the report, and the one owners never look at. It is what makes a raised kidney value meaningful.
• Protein — protein loss through the kidney is significant and often silent.
• Glucose in urine — usually points at diabetes.
• Sediment, crystals, and cells — infection, inflammation, or the stones covered in the urogenital section.
• How the sample was collected changes how it is read; your vet will note it.

24.4 Imaging

• Radiographs (X-rays) — best for bone, for the size and shape of the heart, for the chest, and for gas patterns in the gut. Excellent at showing structure; poor at showing what soft tissue is actually doing.
• Ultrasound — looks inside soft-tissue organs and at fluid, in real time. It is how an abdominal mass, a pyometra, or free blood in the abdomen is usually found.
• Echocardiography — ultrasound of the heart, and the test that actually characterises heart disease. A murmur heard on examination is a reason to do it, not a diagnosis on its own.
• Advanced imaging (CT, MRI) — available in a growing number of referral centres, and the standard for spinal and brain disease.

24.5 Questions that make a report useful

• Which of these values actually concern you, and which are incidental?
• Does this change what we are going to do?
• What would you expect to see if you repeated it in two weeks?
• Is this result consistent with how the dog is behaving at home? (If your vet says no, that is important — trust it, and say what you are seeing.)
• May I have a copy for my records?

Keep every report. A single blood panel is a snapshot; a series of them over years is a trajectory, and a trajectory is what catches chronic kidney disease, endocrine disease, and cancer early. Dally stores and reads your uploaded vet reports for exactly this reason — the value is in the series, not the sheet. Nothing Dally shows you is a diagnosis; it is there to make the conversation with your vet a better one.