The following articles were read in the preparation of this document. Not all articles are sited.

1. Barth JH, Balen AH, Jennings A. Appropriate design of biochemistry request cards can promote the use of protocols and reduce unnecessary investigation. Ann Clin Biochem. 2001 Nov; 38(part 6): 714 -716
2. Bindels R, Hasman A, van Wersch, Pop P, Winkens RA. The reliability of assessing the appropriateness of requested diagnostic tests. Med Decis Making. 2003 Jan – Feb; 23(1): 31 – 37.
3. Bohnen AM. Strategies to improve test ordering in primary care. JAMA 2003, 290 (17): 2253.
4. Bugter-Maessen AM, Winkens RA, Grol RP, Knottnerus JA, Kester AD, Beusmans GH, Pop P. Fcators predicting differences among general practitioners in test ordering behaviour and in the response to feedback on test requests. Fam Pract. 1996 Jun; 13(3): 254 – 258.
5. Emerson JF, Emerson SS. The impact of requisition design on laboratory utiisation. Am J Clin Pathol. 2001 Dec; 116(6): 879 -884.
6. Franks P, Zwanziger J, Mooney C, Sorbero M. Variations in primary care physician referral rates. Health Serv Res. 1999 Apr; 34 (1 part 2): 323 329.
7. Hasman A, Pop P, Winkens RA, Blom JL. Ton test or not to test, that is the question. Clin Chim Acta. 1993 Dec; 222(1-2): 49 – 56.
8. Kravitz RL, Bell RA, Azari, R, Krupt E, Kelly-Reif S, Thom D. Requiest fulfilment in office practice: antecedents and relationship to outcomes. Med Care. 2002 Jan; 40(1): 38 – 51.
9. Lewandrowski K. Managing utilization of new diagnostic tests. Clin Leadersh Manag Rev. 2003 Nov-Dec; 17(6): 318 -324.
10. Mann S, Tietjens J, Law K, Elley R. Troponin testing for chest pain in primary healthcare: a New Zealand audit. NZ Med J. 2006 Jul; 119(1238).
    van Merode GG, Stroink AE, Maarse JA, Goldschmidt HM. Impact of insurance coverage type on laboratory test ordering behaviour of general practitioners. World Hosp Health Serv. 2000; 36(3): 7 – 12.
11. Pagni A, Plebani M. The laboratory and the general practitioner. Clin Cim Acta. 1999 Feb; 280(1-2): 13 – 24.
12. Plebani M. Quality specifications: self pleasure for clinical laboratories or added value for patient management? Clin Chem Lab Med. 2007; 45(4): 462 – 466.
13. Report of the Referred Services advisory group to the Ministry of Health. Referred services management: building towards equity, quality and better health outcomes. Octover 2002.
14. Smellie WS, Lowrie R, Wilkinson E. A laboratory based intervention to improve appropriateness of lipid tests and audit cholesterol lowering in primary care. BMJ. 2001 Nov; 323(7323): 1224 - 1227.
15. Smellie WS, Clark G, McNulty CA. Inequalities of primary care microbiology testing between hospital catchment areas. J Clin Pathol. 2004 June; 56(12): 933 – 936.
16. Sodi R, Hine T, Shenkin A. General Practitioner (GP) cardiac troponin test requesting: findings from a clinical laboratory audit. Ann Clin Biochem. 2007 May; 44(part3): 290 – 293.
17. Stuart W, Smellie W, Lowrie R, Wilkinson E. Quality improvement report: A laboratory based intervention to improve appropriateness of lipid tests and audit cholesterol lowing in primary care. BMJ 2001; 323: 1224 - 1227.
18. Verstappen WH, van der Weijden T, Sijbrandij J, Smeele I, Hersen J, Grimshaw J, Grol RP. Effect of a practice based strategy on test ordering performance of primary care physicians: a randomised trial. JAMA. 2003 May; 289918) 2407 -2412.
19. Verstappen WH, ter Riet G, Dubois WI, Winkens R, Grol RP, van der Weijden T. Variation in test ordering behaviour of GPs: professional; or context related factors? Fam Pract. 2004 Aug; 21(4): 387 – 395.
20. van der Weijden T, van Bokhoven MA, Dinant GJ, van Hasselt CM, Grol RP. Understanding laboratory testing in diagnostic uncertainty: a qualitative study in general practice. Br J Gen Pract. 2002 Dc; 52(485): 974 – 980.
21. Winkens RA, Pop P, Grol RP, Kester AD, Knottnerus JA. Effect of feedback on test ordering behaviour of general practitioners. BMJ. 1992 Apr; 304 96834 0: 1093 -1096.
22. Winkens RA, Pop P, Bugter-Maessen AM, Grol RP, Kester AD, Beusmans GH, Knottnerus JA. Randomised controlled trial of routine individual feedback to improve rationality and reduce numbers of test requests. Lancet. 1995 Feb; 345(8948): 498 – 502.
23. Winkens RA, Grol RP, Beusmans GH, Kester AD, KNotternerus JA, Pop P. Does the reduction in general practitioners’ use of diagnostic tests lead to more hospital referrals? Br J Gen Pract. 1995 June; 45(395): 289 -292.
24. Winkens RA, Pop P, Grol RP, Bugter-Maessen AM, Kester AD, Beusmans GH, Knottnerus JA. Effects of routine individual feedback over nine years on general practitioners’ requests for tests. BMJ. 1996 Feb; 312(7029): 490.
25. Winkens RA, Ament AJ, Pop P, Rol RP, Knottnerus JA. Routine individual feedback on requests for diagnostic tests: and economic evaluation. Med Decis Making. 1996 Oct – Dec; 16(4): 309 – 314.