Editing Prothrombin time (section)

===Prothrombin time ratio===
The prothrombin time ratio is the ratio of a subject's measured prothrombin time (in seconds) to the normal laboratory reference PT. The PT ratio varies depending on the specific reagents used, and has been replaced by the INR.<ref>{{Cite journal|last=Bussey|first=Henry I.|date=1992-02-01|title=Reliance on Prothrombin Time Ratios Causes Significant Errors in Anticoagulation Therapy|journal=Archives of Internal Medicine|language=en|volume=152|issue=2|pages=278–82|doi=10.1001/archinte.1992.00400140032009|pmid=1739354|issn=0003-9926}}</ref> Elevated INR may be useful as a rapid and inexpensive [[biomarker|diagnostic]] of infection in people with COVID-19.<ref>{{Cite journal|last1=Thachil|first1=Jecko|last2=Tang|first2=Ning|last3=Gando|first3=Satoshi|last4=Falanga|first4=Anna|last5=Cattaneo|first5=Marco|last6=Levi|first6=Marcel|last7=Clark|first7=Cary|last8=Iba|first8=Toshiaki|date=2020-03-25|title=ISTH interim guidance on recognition and management of coagulopathy in COVID-19|journal=Journal of Thrombosis and Haemostasis|volume=18|issue=5|pages=1023–1026|language=en|doi=10.1111/jth.14810|pmid=32338827|pmc=9906133 |doi-access=free}}</ref>