Table 1.
Comparison of results obtained for coagulation variables in feline plasma specimens sampled in citrate and CTAD tubes
| Variables | CTAD |
Citrate |
P value CTAD vs citrate |
Passing–Bablock |
Repeatability (percentage coefficient of variation) 7 | N cases differently classified according to RI 7 | |||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| n | Median | Min–max | Median | Min–max | r | a (95% CI) | b (95% CI) | ||||
| PT (s) | 60 | 11.8 | 10.7–14.3 | 11.4 | 10.4–13.7 | <0.0001 | 0.90 | 1.00 (0.95–1.17) | 0.40 (–1.58 to 0.96) | 1.20 | 2 |
| APTT (s) | 59 | 15.1 | 11.1–116.3 | 15.1 | 12.4–99.3 | 0.7692 | 0.88 | 1.04 (0.95–1.18) | −0.60 (–2.68 to 0.78) | 0.85 | 0 |
| Fibrinogen (g/l) | 60 | 1.91 | 1.10–12.00 | 1.83 | 1.05–12.00 | 0.0012 | 0.99 | 1.05 (1.03–1.10) | −0.04 (–0.11 to 0.02) | 3.40 | 0 |
| AT (%) | 60 | 149 | 70–200 | 145 | 76–200 | <0.0001 | 0.96 | 1.02 (0.95–1.11) | 1.49 (–10.52 to 12.14) | 1.65 | 3 |
Comparison of results by Student’s paired t-test or Wilcoxon’s test according to homoscedasticity
r = Spearman’s correlation coefficient; a and b = slope and intercept of Passing–Bablock agreement, respectively; CI = confidence interval; N = number of cases which would have been classified differently according to the limits of the RI; RI = reference interval; PT = prothrombin time; APTT = activated partial thromboplastin time; AT = antithrombin; CTAD = citrate, theophylline, adenosine and dipyridamole