![David Steensma, MD on Twitter: "This is Mary from Norway (1914-2002), the first patient described with “proaccelerin” (Factor V) deficiency. Since FXIII is the highest numbered coagulation factor (though there are more!) # David Steensma, MD on Twitter: "This is Mary from Norway (1914-2002), the first patient described with “proaccelerin” (Factor V) deficiency. Since FXIII is the highest numbered coagulation factor (though there are more!) #](https://pbs.twimg.com/media/EMGU6oqU8AAYhSl.jpg)
David Steensma, MD on Twitter: "This is Mary from Norway (1914-2002), the first patient described with “proaccelerin” (Factor V) deficiency. Since FXIII is the highest numbered coagulation factor (though there are more!) #
![David Steensma, MD on Twitter: "There are many variant factor names too, eg #FactorVLeiden, first described in Dutch city of Leiden in 1994. Here I am enjoying the Dutch tradition of raw ' David Steensma, MD on Twitter: "There are many variant factor names too, eg #FactorVLeiden, first described in Dutch city of Leiden in 1994. Here I am enjoying the Dutch tradition of raw '](https://pbs.twimg.com/media/EMGVBf1U0AAhTCx.jpg:large)
David Steensma, MD on Twitter: "There are many variant factor names too, eg #FactorVLeiden, first described in Dutch city of Leiden in 1994. Here I am enjoying the Dutch tradition of raw '
![David Steensma, MD on Twitter: "Paul Arnor Owren (1905-1990) in Oslo evaluated Mary in 1943 for menorrhagia. She'd been almost blind since age 3 after an episode of epistaxis/syncope (?retinal hypoxia). Owren David Steensma, MD on Twitter: "Paul Arnor Owren (1905-1990) in Oslo evaluated Mary in 1943 for menorrhagia. She'd been almost blind since age 3 after an episode of epistaxis/syncope (?retinal hypoxia). Owren](https://pbs.twimg.com/media/EMGU7KHVUAAJ7WE.jpg)
David Steensma, MD on Twitter: "Paul Arnor Owren (1905-1990) in Oslo evaluated Mary in 1943 for menorrhagia. She'd been almost blind since age 3 after an episode of epistaxis/syncope (?retinal hypoxia). Owren
![Thread by @DavidSteensma: "This is Mary from Norway (1914-2002), the first patient described with “proaccelerin” (Factor V) deficiency. Since FXIII is the highest numb […]" #HematologyTweetstory #FactorVLeiden Thread by @DavidSteensma: "This is Mary from Norway (1914-2002), the first patient described with “proaccelerin” (Factor V) deficiency. Since FXIII is the highest numb […]" #HematologyTweetstory #FactorVLeiden](https://pbs.twimg.com/media/EMGVDB-UEAA4AZT.jpg)