Spanish to English Medical Medical (general) Blood tests

I am looking for the correct way to express the above phrase in English. The context is blood test results for coagulation and the report shows three different tests that were all 'annulled' because there was no coagulation eg.

COAGULACIÓN
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Anulada por incidencia
No coagula. Anula prueba.

What is the best way to say 'por incidencia' in this context?

Many thanks!