wiredgardener68 said:My doctor went on vacation without explaining what my results actually meant. Please, is this okay? 🙂
Prothrombin Time: 14.66 S (Normal range 16 - 21 S)
D-DIMER: 0.48 mg/L (Normal range < 0.50 mg/L)
Fibrinogen: 5.3 g/L (Normal range 1.8 - 3.5 g/L)
I'm pregnant, 13 weeks and 2 days. During my last exam, she mentioned my Fibrinogen was elevated and told me to retest (which is what this is)... because while Fibrinogen is expected to be high during pregnancy, mine might be a bit higher than what she usually sees. She didn't comment on the other values, so I'm wondering what the lower PT value means.
Thanks so much!
Hello,
Regarding the fibrinogen level, it’s only a very slight deviation considering how far along you are.
In fact, according to medical literature (for example, Abbassi-Ghanavati, Greer, and Cunningham in "Pregnancy and laboratory Studies: a reference table for clinicians," published in American Obstetrics & Gynecology), fibrinogen reference ranges during pregnancy shift significantly. For the first trimester, they go up to 5.1 g/l, for the second up to 5.4 g/l, and by the third, up to 6.2 g/l. Given that, 5.3 g/l doesn't look alarming to me.
Is it technically higher? Yes. But you shouldn't use the standard non-pregnant intervals; an increase in fibrinogen is a normal physiological response during pregnancy.
On the other hand, you have a rather interesting result regarding your prothrombin time. It's not a straightforward one to interpret, mostly because clinical attention is usually focused on prolonged clotting times, not shortened ones.
The value suggests a shortened prothrombin time. Your OB likely didn't comment on it simply because she wasn't sure how to interpret it herself.
To be honest, even I am unsure how significant this specific deviation is or if it warrants any concern at all.
A shortened prothrombin time can sometimes be seen in individuals with certain fibrinogen disorders (specifically dysfibrinogenemias). Since those are rare conditions, they really require a hematologist with specialized expertise to manage.
Frankly, I'm not sure what I would do in your shoes. Perhaps I'd have the prothrombin time and other coagulation parameters retested...
Your best bet is to ask your OB about the next steps.
Best regards. 🙂