For discriminant construct validity, Turkish version of SF-MPQ was correlated with blood pressure values of the patients. There was a significant correlation with blood pressure values (r = 0Æ78, p < 0Æ001 for test, r = 0Æ73, p 0Æ001 for retest). This hemodynamic variable was collected because previous studies had shown that increased arterial blood pressure is the most frequent physiological indicators of pain noted by observing nurses (Puntillo et al. 1997, Herr et al. 2006). A study of patients having difficulties with verbal communication showed that the most frequently noted physiological indicators of pain were increased heart rate and increased arterial blood pressure (Puntillo et al. 1997). These results support the construct validity of Turkish version of the SF-MPQ and that it is a valid instrument for use in Turkish samples.