IMHA Toolkit

Clinical protocols & thrombosis prevention awareness

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Canine IMHA Dosage Calculator

Canine IMHA Dosage Calculator

Clinical Basis: Derived from the 2019 ACVIM Consensus Statement on the Treatment of IMHA in Dogs.

Canine Standard Active
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Important Clinical Notice Calculations provided by the IMHA Toolkit are for academic review and clinical reference purposes only. All dosage values, clinical plans, and prescribing paths must be independently verified by the attending veterinary surgeon prior to administering treatment to any patient.
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Weight Parameters
Patient Weight Entry

1. Immunosuppressive Plan

Prednisone / Prednisolone
2 mg/kg/day
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Suggested baseline: 2 mg/kg/day split twice daily (BID).
Mycophenolate Mofetil
10 mg/kg BID
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Dose target: 10 mg/kg twice daily (BID). Add immediately for critical or rapidly declining patients.

📋 ACVIM Single vs. Dual Therapy Advisor

Check presenting clinical signs to evaluate if dual protocol is indicated immediately:

Clinical Protocol Suggestion: Select presenting signs above to receive point-of-care recommendations.

2. Thrombosis Prevention

Critical Priority
Clopidogrel Bisulfate
Platelet Inhibitor
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Standard dosage: 2 mg/kg once daily. Preferential choice over aspirin under modern guidelines.
Rivaroxaban
Factor Xa Block
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Standard dosage: 0.5 mg/kg once daily. Directly targets factor Xa to prevent systemic coagulation.
⚠️ Prescribing Rule (Monotherapy Standard) Veterinarians should prescribe **EITHER** Clopidogrel **OR** Rivaroxaban alone. Combining an antiplatelet with an anticoagulant significantly escalates the risk of gastrointestinal hemorrhage, and should be reserved strictly for intensive care patients with active PTE or DIC.
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Blood Clots Are a Major Risk in IMHA. Hypercoagulability starts instantly. Antithrombotic therapy should not be delayed; initiate standard protocols concurrently with the first steroid dose.
⚠️ Please independently verify all calculated values before prescribing or administering medication.

📋 Canine Diagnostic & Clinical Guidelines

🔍 True Spherocytes vs. Artefacts

True spherocytes indicate partial immune destruction of red blood cell membranes. Look for small, hyperchromatic erythrocytes lacking a central pallor area. Always differentiate from artefacts on thin blood smear edges.

🩸 Auto-Agglutination vs. Rouleaux

True auto-agglutination is visible on a cold glass slide. Always differentiate from natural physical rouleaux stacks by executing a Saline Dilution Test (1 part blood to 4 parts saline) to verify true immune haemolysis.

📚 Clinical Decision Guide: Single vs. Dual Protocols ▼

The Core Rule: Glucocorticoids are the absolute first-line foundation of therapy. They have a rapid onset of action (hours). Mycophenolate Mofetil (MMF) is a secondary agent with a delayed onset of action (taking several days to reach full clinical efficacy).

When to use Dual Therapy (from Day 1): According to the ACVIM consensus, concurrent therapy should be initiated immediately if the patient exhibits signs of severe, high-risk, or life-threatening disease, including intravascular haemolysis, non-regenerative anaemia, profound auto-agglutination, or severe tissue hypoxia.

When to use Sequential Therapy: For dogs presenting with stable, mild, or moderate extravascular IMHA, starting with Prednisone alone is highly acceptable. Add Mycophenolate later as a secondary "rescue" or "sparing" agent if treatment fails (PCV drops ≥ 5% in 24h after 5-7 days of steroids) or if severe steroid intolerance develops.

Mathematical Formulas (Proof)
Immunosuppressant (Prednisone): Weight (kg) × 2 mg/kg/day (capped at 60 mg/day max daily)
Secondary Agent (Mycophenolate): Weight (kg) × 10 mg/kg given twice daily (BID)
Platelet Inhibitor (Clopidogrel): Weight (kg) × 2 mg/kg given once daily
Factor Xa Block (Rivaroxaban): Weight (kg) × 0.5 mg/kg given once daily
Source: Swann JW, et al. ACVIM Consensus Statement on treatment of IMHA in dogs. JVIM 2019. CALCULATION SHOWN FOR TRANSPARENCY