diff --git a/src/entity/reference_range.ts b/src/entity/reference_range.ts
index da6a1d3..0f20235 100644
--- a/src/entity/reference_range.ts
+++ b/src/entity/reference_range.ts
@@ -34,6 +34,7 @@ export class ReferenceRange {
 		precision: 10,
 		scale: 2,
 		nullable: false,
+		default: 0,
 	})
 	value_min: number;