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Technical Briefs |
1 Department of Chemical Pathology, Queensland Health Pathology Service, Princess Alexandra Hospital, Woolloongabba, Queensland Australia
2 Department of Chemical Pathology, Sullivan and Nicolaides Pathology, Taringa, Queensland, Australia
aaddress correspondence to this author at: Department of Chemical Pathology, Queensland Health Pathology Service (QHPS), Princess Alexandra Hospital, Ipswich Road, Woolloongabba, Queensland 4102, Australia; fax 61-7-3240-7070, e-mail Goce_Dimeski@health.qld.gov.au
| The first 20% of the full text of this article appears below. |
The new Roche IFCC-recommended method for lactate dehydrogenase (LD) has been reported (1)(2) to produce duplicate errors with Becton Dickinson (BD) lithium-heparin tubes with plasma separators. Separate studies (3) of Sarstedt tubes showed no such errors. To overcome and minimize duplicate errors, Roche has modified the method to incorporate a predilution step. This modified method can be used only on dilutor systems (Modular P and Hitachi 911, 912, and 917), but not on nondilutor systems (Modular D and Hitachi 747 and 902; Roche). We tested the modified method for duplicate errors and tested lithium-heparin tubes (with plasma separator) from another major supplier for duplicate errors.
Blood samples were collected in three different tubes: Greiner Vacuette lithium-heparin tubes with plasma separator (prod. no. 455083); Greiner Vacuette serum tubes with plasma separator (prod. no. 455078); and BD Vacutainer PST II lithium-heparin tubes with plasma separator (prod. no. 367377). Three IFCC LD methods were set up on our Modular DP system: the Modular D, the Modular P IFCC method, and the Modular P IFCC modified method with predilution. The two LD methods on the Modular
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