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Definition

A medical-grade medicinal leech is an animal bred and conditioned under controlled conditions so it is safe and predictable to use on a patient. The term is not a marketing label: it is a chain of documented husbandry controls — controlled breeding, fasting and conditioning, size grading, batch traceability, and health and CITES documentation — that together replace the unknown history of a wild-caught leech with verifiable provenance. Each control exists for a clinical reason: breeding removes uncertainty about diet, pathogens and age; fasting makes the animal attach and draw on demand; grading matches it to the procedure; and documentation makes the supply chain auditable. Anything sold without this chain is a clinical risk rather than a saving. The criteria below define what “medical-grade” should mean from a B2B buyer’s point of view.

“Medical-grade” is not a marketing word. For leeches it is a chain of controlled conditions that together make the animal safe and predictable to use on a patient.

What are the criteria for a medical-grade leech?

Medical-grade supply means the following criteria are met, in order, and documented end to end:

Bred, not foraged. Controlled breeding replaces the unknown history of a wild leech — diet, pathogens, age, water quality — with documented provenance and consistent health.
Fasted and conditioned. A hungry leech attaches and draws; a recently fed one does not. Fasting and conditioning are what make a leech behave on demand in the operating room.
Size-graded to the procedure. The animal is graded by body length so it matches the indication and expected draw volume.
Batch-traceable. Stock is traceable from breeding line to dispatch, so any issue can be tracked back.
Documented. The animal is accompanied by health and CITES documentation appropriate to the destination.

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