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Table 2 Administrated heparin dosage and laboratory test results

From: Variation in coagulation factor activity levels cause discrepancies between activated partial thromboplastin time and anti-Xa activity for heparin monitoring: a retrospective observational study

 

All samples n = 271

Lower group (APTT < Anti-Xa activity)

n = 44

Concordant group (APTT = Anti-Xa activity)

n = 121

Upper group (APTT > Anti-Xa activity)

n = 106

P value

Heparin dosage (units/h)

600 (400–800)

800 (600–1000)b

624 (500–800)b

438 (400–600)a,c

< 0.001

White blood cell counts, 103/mm3

10.4 (7.85–13.5)

10.0 (7.6–12.6)b

10.1 (7.7–13.2)

11.2 (8.2–14.5)c

0.331

Hemoglobin, g/dL

9.7 (8.9–11.3)

10.4 (9.3–12.5)

9.7 (8.6–11.6)

9.5 (8.8–10.3)

0.007

Platelet counts, 103/mm3

149 (75–250)

210 (108–273)b

179 (102–308)b

79 (50–188)a,c

 < 0.001

BUN, mg/dL

35 (25–49)

29 (20–42)

32 (25–50)

38 (27–51)

0.620

Creatinine, mg/dL

1.11 (0.73–2.19)

0.96 (0.67–1.57)

1.145 (0.73–2.41)

1.19 (0.75–2.19)

0.276

PT-INR

1.14 (1.08–1.26)

1.14 (1.08–1.27)

1.11 (1.05–1.21)b

1.19 (1.11–1.36)a

 < 0.001

APTT, s

45.1 (37.5–58.8)

50.7 (38.1–60.3)a,b

37.8 (33.8–45.1)b,c

52.3 (45.1–71.0)a,c

 < 0.001

Antithrombin, %

73 (63–88)

88 (75–96)b

76.5 (69–92)b

68 (54–76)a,c

 < 0.001

Fibrinogen, mg/dL

419 (304–537)

439 (404–524)b

475 (385–579)b

347 (250–427)a,c

 < 0.001

FDP, μg/mL

12.65 (7.4–27.7)

12.0 (8.2–19.6)

14.3 (6.2–34.4)

11.8 (7.9–21.5)

0.835

d-dimer, μg/mL

7.19 (3.9–15.035)

6.49 (3.55–10.25)

8.08 (3.96–19.52)

7.11 (3.94–12.92)

0.547

Coagulation factor activity, %

 Factor II

82 (67–95)

95 (84–105)a,b

88 (76–97)b

65 (51–78)a,c

 < 0.001

 Factor V

96 (75–121)

102 (91–130)b

105 (91–133)b

78 (60–100)a,c

 < 0.001

 Factor VII

69 (50–89)

72 (57–90)b

77 (61–95)b

57 (41–84)a,c

 < 0.001

 Factor VIII

144 (107–186)

178 (131–201)b

158 (123–201)b

126 (93–165)a,c

 < 0.001

  Factor VIII activity > 200%, n (%)

106 (39%)

16 (37%)

32 (26%)

58 (21%)

 < 0.001

 Factor IX

97 (76–112)

104 (94–116)b

108 (94–124)#

75 (58–96)a,c

 < 0.001

 Factor X

75 (62–88)

77 (68–90)#

80 (72–95)#

66 (55–77)a,c

 < 0.001

 Factor XI

72 (55–88)

86 (79–106)#

79 (67–96)

53 (40–64)a,c

 < 0.001

 Factor XII

40 (29–56)

52 (32–64)#

50 (35–65)#

32 (23–41)a,c

 < 0.001

Anti-Xa activity (IU/mL)

0.23 (0.12–0.41)

0.63 (0.47–0.73)a,b

0.23 (0.11–0.34)c

0.18 (0.11–0.28)c

 < 0.001

  1. “APTT < Anti-Xa activity” indicates APTT measurement/theoretical ratio < 80%; “APTT = Anti-Xa activity” indicates APTT measurement/theoretical ratio 80–120%, “APTT > Anti-Xa activity” indicates APTT measurement/theoretical ratio > 120%. The theoretical APTT values were calculated from a curve-fitting equation using measured anti-Xa activity results. BUN blood urea nitrogen, PT-INR prothrombin time-international normalized ratio, APTT activated partial thromboplastin time, FDP fibrinogen/fibrin degradation products
  2. aStatistical significance for the concordant group
  3. bStatistical significance for the upper group
  4. cStatistical significance for the lower group