Sodium Citrate 1.8 mL Paed (Clear/Pale Blue Inner)
Sodium Citrate 1.0 mL Neonate (Pale Blue Top)
Accurate filling of specimen tube essential. All collections that include Coagulation testing must be sent to the laboratory in a BLUE specimen bag. If specimen cannot be sent to testing laboratory immediately, maintain specimen at room temperature. If collected as part of a coagulation profile or studies, samples must be delivered to laboratory within 4 hrs. Please ask the patient what anticoagulants they are on and the dose, record on request form.
Because of the D-dimer test's high sensitivity, low specificity and high negative predictive value, the best use of the test is to EXCLUDE VTE and not to CONFIRM it. In a patient with a low clinical probability of having a DVT and a NEGATIVE D-dimer test, the condition can be ruled out with a high degree of certainty. (The same does not necessarily apply for possible pulmonary embolism.) The D-dimer test may remain positive for ~2 weeks after major abdominal surgery; a positive value after 2 weeks may be suggestive of VTE in a patient with symptoms of a DVT or PE