Table 2.

Preoperative and day of the operation group and save samples taken.

Group and save	Hip		Knee			Shoulder			Average (%)
	Primary total	Revision	Primary total	Revision	Unicondylar	Primary total	Revision	Primary hemi-arthroplasty
Routine preoperative and valid at operation	238	27	235	22	28	37	5	2	83.5
Routine preoperative, no valid at operation	9	0	35	1	12	9	1	0	9.4
No routine preoperative and valid at operation	22	1	0	0	0	0	0	0	3.2
No routine preoperative and no valid at operation	12	0	12	1	1	1	0	0	4.7