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    Elevated Prothrombin time is common in conditions such as liver dysfunction and use of Vitamin K antagonists. Polycythaemia is among the uncommon causes of elevated prothrombin time. Elevated hematocrit greater than 55% leads to a decrease in plasma of the blood sample, thereby reducing the coagulating factors available. Hence, it is recommended to adjust the citrate (anticoagulant) concentration for collecting blood sample from patients with high Hematocrit to get correct Hematocrit value.


    N Vaidya, D Jaisy, S Koju. Secondary Polycythaemia as an Unusual Cause of Falsely Elevated Prothrombin Time and International Normalized Ratio. Kathmandu University medical journal (KUMJ). 2020 Apr-Jun;18(70):203-204

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    PMID: 33594032

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