Turkiye Klinikleri Journal of Medical Sciences

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Rotasyonel Tromboelastografi ile NATEG Testinin Sağlıklı Grupta Referans Aralığı Çalışması
Reference Interval Study of Rotational Thromboelastography and NATEG Test in a Healthy Group
Nilgün TEKKEŞİNa, Cumhur KILINÇb
aBiyokimya Kliniği, Memorial Hastanesi, İstanbul bBiyokimya AD, Dicle Üniversitesi Tıp Fakültesi, Diyarbakır
Turkiye Klinikleri J Med Sci. 2011;31(6):1385-91
doi: 10.5336/medsci.2010-20290
Article Language: TR
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Amaç: Konvasiyonel yöntemin bir ileri modeli olarak ayırıcı tanıda kullanılan rotasyonel tromboelastografinin (ROTEG) bir testi olan NATEG (non-aktif tromboelastografi) ile hemostazın genel bir değerlendirilmesi yapılabilmektedir. Henüz bir referans aralığı çalışması yapılmamış olan NATEG'in prognostik değerinin bilinmesi yanında testin çalışma esnasında herhangi bir reaktif tüketmemesi, bu nedenle de maliyetinin düşük olması karşısında bu teste ait bir referans aralığının belirlenmesine yönelik bir gereklilik oluşmuştur. Bu doğrultuda kendi popülasyonumuzda referans değerlerini inceledik, üretici firmanın sundukları değerlerle karşılaştırdık ve cinsiyete göre dağılımlarını değerlendirdik. Gereç ve Yöntemler: Ölçüm için 300 adet sitratlı kan ile çalışılan standardize ROTEG tekniği kullanıldı. Ölçülen parametreler arasında pıhtılaşma zamanı (CT), pıhtı oluşum zamanı (CFT) ve maksimum pıhtı sertliği (MCF) yer aldı. Bulgular: Referans aralıkları CT için 256-767 sn, CFT için 58-285 sn ve MCF için 49-73 mm bulundu. Buna göre, yaşları 20 ile 37 arasında değişen 300 numune için %97.5 güven aralığında hesaplanan değerler, üretici firmanın sunduğu değerlerden MCF hariç anlamlı farklılık gösterdi (p< 0.001). Her iki cinsiyet karşılaştırıldığında yine MCF hariç NATEG parametrelerinde istatistiksel olarak belirgin farklılık izlendi (p< 0.001). Sonuç: Üretici firma tarafından sunulan ve sitratlı plazmadan çalışılan NATEG parametrelerine ait referans değerleri, her popülasyonda kullanıma uygun olmayabilir. Önerimiz, klinik veya araştırma amaçlı ROTEG kullanan merkezlerin seçilen hedef popülasyonda referans aralığı belirlemesidir. Her ROTEG sistemi kuruluşunda referans aralığı tayinine gitmek pratikte çok mümkün olamasa da, NATEG testinin herhangi bir maliyet gerektirmeden çalışılabilmesi kullanımında daha etkin olmasını sağlar.

Anahtar Kelimeler: Referans değerleri; trombelastografi; protrombin zamanı; kısmi tromboplastin zamanı
ABSTRACT
Objective: A general assessment of hemostasis may be done with NATEG (non-active thromboelastography) that is a test of rotational thromboelastography (ROTEG) used in differential diagnosis as an advanced model of the conventional method. Determination of a reference interval was needed since the prognostic value of NATEG is known and a reference interval study had not been conducted yet although the test does not consume a reactant and thus has a low cost. Therefore we analysed the reference values in our population, compared them with the values presented by the manufacturer and analyzed their distribution according to gender. Material and Methods: For measurements, standardized ROTEG technique was employed using 300 citrated blood samples. Clotting time (CT), clot formation time (CFT) and maximum clot firmness (MCF) were the measured parameters. Results: Reference intervals were found as 256-767 sec for CT, 58-285 sec for CFT and 49-73 mm for MCF. According to our results, values for 300 samples aged between 20-37 years, calculated in 97.5% confidence interval differed significantly from the values presented by the manufacturer except for MCF (p< 0.001). When the genders were compared, a statistically significant difference was seen in NATEG parameters except for MCF (p< 0.001). Conclusion: Reference values of NATEG parameters presented by the manufacturer and studied from citrated plasma may not be appropriate for using in every population. We recommend that centers that use ROTEG for research or clinical purposes should determine a reference interval for the selected target population. Although determination of a reference interval at every ROTEG system establishment is not always practical, the ability of NATEG test to be studied without a cost enables its use in a more effective fashion.

Keywords: Reference values; thrombelastography; prothrombin time; partial thromboplastin time

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