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Medicines MarstacimabQuestion & answer

Marstacimab · Medicine question

Does marstacimab affect routine clotting tests?

iatroX medicinesPublished 17 August 2026Reviewed 17 August 2026

The answer

Answer

It does not produce clinically meaningful changes in PT or aPTT, so these tests do not reliably measure its activity.

Sources for this answer

Hympavzi 150 mg solution for injection in pre-filled penemc · SmPC Current selected SmPC · Version 4

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The full medicine guide

Marstacimab

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More questions about Marstacimab

What is marstacimab used for?Is marstacimab a clotting-factor replacement?Can marstacimab treat a breakthrough bleed?Can marstacimab be self-injected?What should clinicians know before surgery?

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