How to Read Your Cat's Blood Panel Results — Complete Guide
Last reviewed: April 2026
Cat blood tests measure organ function, detect disease, and monitor health. Key values to watch: liver enzymes (ALT, ALP), kidney function (BUN, creatinine), thyroid levels (T4), and blood cell counts.
Understanding your cat's blood panel results can feel overwhelming, but knowing the basics helps you ask better questions and make informed decisions about your feline's health. Most panels include two parts: the CBC (blood cells) and the chemistry panel (organ function, T4) — this guide covers both.
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Types of Cat Blood Tests
Most blood panels for cats include several key components:
Complete Blood Count (CBC) — Counts and examines blood cells including red blood cells, white blood cells, and platelets. For detailed CBC interpretation, see our complete guide to cat CBC results.
Chemistry Panel — Measures organ function, blood sugar, proteins, and electrolytes. Essential for detecting liver and kidney disease.
Thyroid Testing (T4) — Screens for hyperthyroidism, extremely common in senior cats over 10 years old.
Quick Reference: Normal Cat Blood Values
| Test | Normal Range | What It Checks |
|---|---|---|
| RBC | 5.0–10.0 million/μL | Anemia, blood loss |
| HCT | 24–45% | Hydration, anemia |
| WBC | 5,500–19,500/μL | Infection, immune system |
| Platelets | 300,000–800,000/μL | Clotting ability |
| ALT | 12–130 U/L | Liver cell damage |
| ALP | 14–111 U/L | Liver, bile duct |
| AST | 10–100 U/L | Liver, muscle damage |
| GGT | 0–4 U/L | Bile duct, liver disease |
| BUN | 14–36 mg/dL | Kidney function |
| Creatinine | 0.8–2.4 mg/dL | Kidney function |
| SDMA | 0–14 µg/dL | Early kidney disease |
| T4 | 0.8–4.7 µg/dL | Thyroid (hyperthyroidism) |
| Glucose | 74–159 mg/dL | Diabetes, stress |
| Albumin | 2.1–3.3 g/dL | Liver, nutrition, protein loss |
| Phosphorus | 2.4–8.2 mg/dL | Kidney disease, bone |
| Calcium | 9.0–11.9 mg/dL | Cancer, parathyroid |
| Potassium | 3.5–5.8 mEq/L | CKD, hypokalemia |
*Normal ranges may vary slightly between laboratories. Always consult your veterinarian for interpretation specific to your cat.
Understanding CBC Results
Red Blood Cell Values
RBC (Red Blood Cell Count): Normal range 5.0-10.0 million/μL. Low values suggest anemia; high values may indicate dehydration.
Hemoglobin (HGB): Normal range 8-15 g/dL. Carries oxygen throughout the body. Low levels indicate anemia.
Hematocrit (HCT): Normal range 24-45%. Shows percentage of blood made up of red blood cells. Low values mean anemia; high values suggest dehydration.
For detailed understanding of these values, see our comprehensive cat CBC explained guide.
White Blood Cell Values
WBC (White Blood Cell Count): Normal range 5,500-19,500/μL. High values often indicate infection or inflammation; low values may suggest immune system issues.
Neutrophils, Lymphocytes, Eosinophils: Different types of white blood cells that help identify specific conditions like bacterial infections, allergies, or stress.
Understanding Chemistry Panel Results
Liver Function Tests
ALT (Alanine Aminotransferase): Normal range 12–130 U/L. Elevated levels indicate liver cell damage. Unlike dogs, even mild ALT elevation in cats warrants attention — cats are more prone to hepatic lipidosis.
ALP (Alkaline Phosphatase): Normal range 14–111 U/L. Critically, ALP is far more significant in cats than dogs — cats have very little bone-derived ALP, so any elevation usually means liver or bile duct disease. Even mildly elevated ALP in a cat should be investigated.
AST (Aspartate Aminotransferase): Normal range 10–100 U/L. Rises alongside ALT in liver damage. If AST is elevated without ALT, suspect muscle injury rather than liver disease.
GGT (Gamma-Glutamyltransferase): Normal range 0–4 U/L. In cats, elevated GGT alongside ALP strongly suggests bile duct disease or hepatic lipidosis. For detailed interpretation, see our complete guide to cat liver enzymes.
Kidney Function Tests
BUN (Blood Urea Nitrogen): Normal range 14–36 mg/dL. High levels may indicate kidney disease, dehydration, or high-protein diet.
Creatinine: Normal range 0.8–2.4 mg/dL. More specific than BUN for kidney function. Note that creatinine doesn't rise until 75% of kidney function is lost.
SDMA (Symmetric Dimethylarginine): Normal range 0–14 µg/dL. Detects kidney disease when only 25–40% of function is lost — up to 2 years before creatinine rises. If SDMA is elevated but creatinine is normal, take it seriously. See our SDMA in cats guide for IRIS staging details.
For comprehensive kidney health information, see our cat kidney values explained guide.
Thyroid Function
T4 (Total Thyroxine): Normal range 0.8–4.7 µg/dL. High levels indicate hyperthyroidism, extremely common in cats over 10 years old (affects up to 10%). Important caveat: hyperthyroidism can mask concurrent kidney disease by artificially increasing kidney blood flow. When treating hyperthyroidism, recheck kidney values 4–6 weeks after starting treatment.
If diagnosed, treatment often involves methimazole medication or transdermal methimazole.
Other Important Values
Glucose: Normal range 74–159 mg/dL. Important caveat: stress alone can raise glucose to 300+ mg/dL in cats (stress hyperglycemia). A single high reading doesn't confirm diabetes — recheck when calm or check fructosamine. Persistently high glucose may also indicate Cushing's disease or acromegaly.
Albumin: Normal range 2.1–3.3 g/dL. Low albumin alongside elevated liver enzymes suggests serious liver disease or hepatic lipidosis. Low albumin with normal liver values may indicate protein-losing enteropathy (IBD, lymphoma).
Phosphorus: Normal range 2.4–8.2 mg/dL. Elevated phosphorus is a key progression marker in CKD — kidneys lose the ability to excrete it. High phosphorus with elevated creatinine and SDMA confirms significant kidney disease.
Calcium: Normal range 9.0–11.9 mg/dL. Persistently elevated calcium in cats can indicate lymphoma, idiopathic hypercalcemia, or hyperparathyroidism. Requires prompt investigation.
Potassium: Normal range 3.5–5.8 mEq/L. Low potassium (hypokalemia) is common in cats with CKD and can cause muscle weakness and worsening kidney function. Potassium supplementation is often part of CKD management.
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Upload My Cat's Lab ResultsAge-Related Considerations
Senior Cats (7+ Years)
Older cats are more prone to:
• Hyperthyroidism (elevated T4)
• Chronic kidney disease (elevated BUN, creatinine, SDMA)
• Liver disease (elevated ALT, ALP)
• Diabetes (elevated glucose)
Senior cats benefit from twice-yearly bloodwork to catch these conditions early when treatment is most effective.
What Abnormal Results Mean
Slightly Abnormal Values
Values slightly outside normal ranges aren't always concerning, especially if your cat seems healthy. Factors that can affect results include:
• Stress from the vet visit
• Recent meals or fasting
• Medications
• Age-related changes
• Laboratory variation
Significantly Abnormal Values
Values well outside normal ranges typically require follow-up testing or treatment. Your vet will consider:
• How far outside normal the value is
• Your cat's clinical signs and symptoms
• Trends in previous bloodwork
• Other lab values and their patterns
When to Repeat Blood Tests
Your veterinarian may recommend repeat testing for:
• Borderline abnormal results to see if they normalize
• Monitoring chronic conditions like kidney or liver disease
• Checking response to treatment
• Pre-anesthetic screening before surgery
• Annual wellness monitoring, especially in senior cats
Pattern Recognition: What Combinations Mean
Single abnormal values are often less meaningful than patterns. Here are the most common combinations in cats and what they suggest:
BUN high + creatinine high + SDMA high
Chronic kidney disease (CKD) — the most common serious disease in cats. If all three are elevated, use IRIS staging to guide treatment. If only SDMA is elevated with normal creatinine, this is early-stage CKD caught before creatinine rises.
High T4 + creatinine looks normal
Hyperthyroidism masking kidney disease. Treating the thyroid will reduce kidney blood flow and may reveal CKD. Always recheck kidney values 4–6 weeks after starting hyperthyroidism treatment.
Very high ALT + high ALP + high GGT + low albumin
Hepatic lipidosis (fatty liver disease) — especially in overweight cats that stopped eating. A veterinary emergency. Requires nutritional support, often via feeding tube.
High ALT + high ALP + high GGT (without low albumin)
Triaditis — concurrent liver, pancreatic, and intestinal inflammation. Very common in cats. Often requires ultrasound and biopsy to confirm and distinguish from IBD or lymphoma.
High glucose (single reading)
Likely stress hyperglycemia — very common in cats at the vet. Do not diagnose diabetes from one value. Recheck when calm or order a fructosamine test, which reflects average glucose over 2–3 weeks.
Low HCT + high BUN + high creatinine
Anemia of chronic kidney disease. CKD reduces erythropoietin production. The anemia worsens as CKD progresses. May require erythropoietin supplementation at Stage 3–4.
Low potassium + elevated creatinine
Hypokalemic nephropathy — low potassium can itself worsen kidney function in cats. Correcting potassium often improves creatinine. Common in cats eating low-potassium diets or with CKD.
Red Flags: Call Your Vet Today
Most abnormal values can wait for a scheduled appointment. These cannot:
- Platelets below 50,000/μL — high bleeding risk; avoid any trauma or injections
- HCT below 15% — severe anemia; may require emergency blood transfusion
- ALT above 500 U/L — significant liver damage; identify the cause (toxin, lipidosis) immediately
- Creatinine above 5.0 mg/dL — advanced kidney failure; IV fluids and urgent management needed
- Glucose below 60 mg/dL — hypoglycemia; can cause seizures and is life-threatening
- Potassium below 2.5 mEq/L — severe hypokalemia; risk of muscle paralysis and respiratory failure
- T4 above 10 µg/dL — severe hyperthyroidism; cardiac complications are likely
Questions to Ask Your Vet
When reviewing your cat's blood test results, consider asking:
• Which values are most important for my cat's age and health status?
• How do these results compare to my cat's previous bloodwork?
• Are any abnormal values related to medications my cat takes?
• What symptoms should I watch for at home?
• When should we recheck these values?
• Are there any dietary or lifestyle changes that might help?
Related Reading
Cat CBC (Complete Blood Count) Explained
Detailed guide to understanding CBC components
Cat Liver Enzymes Explained
Comprehensive guide to ALT, ALP, AST, and GGT
Cat Kidney Values Explained
Understanding BUN, creatinine, and SDMA
Chronic Kidney Disease in Cats
Stages, symptoms, and management
Methimazole for Cats
Treating hyperthyroidism detected through blood tests
Decode Your Cat's Blood Test Results
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✓ Plain-English explanations of every value
✓ Personalized insights based on breed, age, and health history
✓ Trend analysis comparing results over time
✓ Specific questions to ask your veterinarian
✓ Recommendations for diet, supplements, and monitoring
Analyze My Cat's BloodworkFrequently Asked Questions
What are the most important values to watch on cat bloodwork?
Key values include ALT and ALP for liver function, BUN and creatinine for kidney function, T4 for thyroid function, glucose for diabetes screening, and red blood cell count for anemia detection.
How often should cats get blood tests?
Healthy adult cats typically need annual bloodwork. Senior cats (7+ years) benefit from twice-yearly testing. Cats on medications may need more frequent monitoring as recommended by your veterinarian.
Should I be worried about slightly abnormal values?
Slightly abnormal values often aren't concerning, especially if your cat feels well. Context matters — age, medications, stress, and trends over time are all important factors your vet will consider.
What does a normal CBC look like for cats?
Normal CBC values include RBC 5.0-10.0 million/μL, hemoglobin 8-15 g/dL, hematocrit 24-45%, WBC 5,500-19,500/μL, and platelets 300,000-800,000/μL. Remember that ranges can vary slightly between laboratories.