The longest journal title - (May/25/2007 )
this is the longest title I ever found 
A single growth hormone determination 30 minutes after the administration of the GHRH plus GHRP-6 test is sufficient for the diagnosis of somatotrope dysfunction in patients who have suffered traumatic brain injury.
J Endocrinol Invest. 2007 Mar;30(3):224-9
Laboratory Hematology Issue: Volume 11, Number 3 / September 2005
Laboratory Identification of Familial Thrombophilia: Do the Pitfalls Exceed the Benefits? A Reassessment of ABO-Blood Group, Gender,Age, and other Laboratory Parameters on the Potential Influence on a Diagnosis of Protein C, Protein S, and Antithrombin Deficiency and the Potential High Risk of a False Positive Diagnosis
Laboratory Identification of Familial Thrombophilia: Do the Pitfalls Exceed the Benefits? A Reassessment of ABO-Blood Group, Gender,Age, and other Laboratory Parameters on the Potential Influence on a Diagnosis of Protein C, Protein S, and Antithrombin Deficiency and the Potential High Risk of a False Positive Diagnosis
this is not an article, but it´s very long too:
http://thelongestlistofthelongeststuffatth...atlonglast.com/