diff --git a/src/entity/examination_detail.ts b/src/entity/examination_detail.ts
index a285cdb..f6242f4 100644
--- a/src/entity/examination_detail.ts
+++ b/src/entity/examination_detail.ts
@@ -7,6 +7,8 @@ import {
 	DeleteDateColumn,
 	ManyToOne,
 	JoinColumn,
+	ManyToMany,
+	JoinTable
 } from 'typeorm';
 
 import { Status } from '../types/status';
@@ -34,9 +36,9 @@ export class ExaminationDetail {
 	@JoinColumn()
 	measurement_unit: MeasurementUnit;
 
-	@ManyToOne(() => ReferenceRange, { onDelete: 'NO ACTION', nullable: false })
-	@JoinColumn()
-	reference_range: ReferenceRange;
+	@ManyToMany(() => ReferenceRange)
+	@JoinTable()
+	reference_range: ReferenceRange[];
 
 	@Column({
 		nullable: false,