CBC Analysis - 6-Year-Old Female Dog

Abnormal Values at a Glance

Interpretation

1. Erythrocytosis / Relative Polycythemia (Primary Finding)

• Hb 19.3 g/dL (above 18), HCT 55% (at upper limit), and RBC 8.16 (upper normal) together point to an increased red cell mass.
• This is most likely relative polycythemia due to dehydration/hemoconcentration, which is the most common cause in dogs. Splenic contraction (from excitement/stress at the time of sampling) can also transiently raise these values.
• True absolute polycythemia (primary polycythemia vera, or secondary due to hypoxia/EPO-secreting tumors) is possible but less likely - requires clinical correlation.

2. Leukocytosis (WBC 17,800 /cmm)

• TLC is elevated above the upper normal of 14,200/cmm.
• The differential shows mild lymphocytosis (46%, upper normal is 45%) with neutrophils at 46% (normal).
• This pattern - leukocytosis driven primarily by lymphocytes - can suggest:
  • Chronic infection or inflammation (e.g., tick-borne diseases like Ehrlichia, Babesia, or Leishmania are common causes in the Indian subcontinent)
  • Physiologic leukocytosis (excitement/stress)
  • Early lymphoproliferative disorder (less common)
  • Viral infections

3. Elevated RDW-CV (15.80% vs normal 11.9-14.5%)

• A high RDW indicates anisocytosis - red blood cells are varying in size more than normal.
• In the context of an otherwise elevated Hb, this could reflect:
  • An early regenerative process (reticulocytes mixed with mature RBCs)
  • Concurrent nutritional deficiency (iron, B12, folate)
  • Mixed population of cells from a compensatory response

Differential Diagnoses (Most Likely)

1. Dehydration with relative polycythemia + reactive leukocytosis - most common and benign explanation; check skin turgor, mucous membranes, history of vomiting/diarrhea
2. Tick-borne disease (Ehrlichiosis, Babesiosis, Hepatozoonosis) - very prevalent in Northern India/Uttarakhand; can cause leukocytosis, mild anemia or erythrocytosis depending on stage
3. Chronic inflammatory/infectious process - e.g., pyometra (female dog, 6 years old - high-risk age), chronic UTI, dental disease
4. Physiologic/stress response - epinephrine release causes splenic contraction and leukocytosis
5. Early polycythemia vera - rare; ruled out by clinical signs and EPO levels

Recommended Next Steps

• Clinical exam: Assess hydration status, mucous membrane color, lymph node size, uterine palpation (rule out pyometra - this dog is a 6-year-old intact female, which is a red flag)
• Blood smear examination for tick-borne organisms, RBC morphology, and platelet morphology
• Tick panel (Ehrlichia canis, Babesia canis antibody titers) - given location in Uttarakhand
• Urine specific gravity - to assess hydration and renal concentrating ability
• Abdominal ultrasound - to rule out pyometra, splenomegaly, or mass lesion
• Reticulocyte count - to assess if erythrocytosis is regenerative
• Serum biochemistry - BUN, creatinine, albumin, liver enzymes

Summary

1. Pyometra (life-threatening - must rule out urgently)
2. Tick-borne disease (Ehrlichia/Babesia - very common in this region)
3. Dehydration

Note: This is an interpretation for veterinary use. Dr. Shubham should correlate with clinical signs and history for a definitive diagnosis.