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Table 1 Results of protein C and protein S testing performed at diagnosis and on repeat testing after discontinuing anticoagulation therapy in patients with venous thromboembolism.

From: Normal levels of protein C and protein S tested in the acute phase of a venous thromboembolic event are not falsely elevated

 

Protein C

Protein S

 

Current study

(N = 99)

Previous study[16]

(N = 254)

Current study

(N = 99)

Previous study[16](N = 254)

Initial normal result

99

242

99

242

Initial abnormal result

0

12

0

12

Repeat abnormal result

0

4a

0

6a

Proportion Abnormal on Repeat (95% CI)

0% (0-3.7%)b

40% (35.4-84.8%) b

0% (0-3.7%)b

63.9% (16.8-68.7%) b

  1. CI confidence interval
  2. a Repeat testing was done only if initial test abnormal
  3. b P-value < 0.001 for comparison between current and previous study