Abnormal clotting test - high One stage prothrombin time

[Worriedpersonn]

My daughter ( 12 yrs old) suffers from very heavy periods, so went to Gp who did some blood test.
These are abnormal results and I do worry as I can’t find what that mean..
Her clotting screen is:
One stage prothrombin time 13.2 sec ( normal is 10.3-12.9) flagged as abnormal
Partial thromboplastin time activated 34.7 sec (normal is 26.7-35.7)
Also her Feritin is low (7) flagged as abnormal.
The rest of her FBC, Liver function, Thyroid, Calcium and albumin, urea and electrolytes - is normal
What does that mean?
The gp appointment is in 3 weeks, I only have the results from her Nhs app.
very worried.

I meant how do you treat that?

That result sounds very non-specific and on its own wouldn't point to a clotting problem particularly. If her ferritin is low with heavy periods it seems fairly likely they will start an iron supplement. It's worth looking up iron-containing foods and seeing if you can get anywhere with adding iron to the diet in the longer term.

Not quite the same but my DS had some issues with clotting times. He saw the GP for recurring nosebleeds and was tested. He eventually saw a haematologist who ran more tests and concluded that he is just one of the people who are outside the reference range, they didn't find a sinister underlying cause. He takes a bit longer than average to stop bleeding but he is ok to be viewed as "normal" medically. I don't know how this would affect a female and periods but just wanted to share that our outcome was ok.

I would expect a referral to a haematologist for further investigations
There are medications that can be given to improve clotting and reduce bleeding

We never noticed any previous bleeding issues like bleeding nose, even her scuffs on knees for example etc healed ok, with no any prolonged bleeds.
Only when she started her periods 8 months ago, these were very heavy, she needed to change her pads very frequently, hourly and would bleed though period pants.
Also these periods are irregular, sometimes they come in 20 days and are light and other times very heavy.
The Gp receptionist booked her a routine phone appointment in 3 weeks.

I looked it up online on various medical sites and for her age group ( 11-16y) the PT value should be up to 13.8 sec so I’m confused.

These results are not significant, may need to be repeated. Iron supplements may be helpful, possibly some hormone treatment to ease periods. Retired haematologist

Her iron level is low , probably due to her awful periods,but the other tests are normal or almost normal so I am not convinced that there is a clotting issue.

My DD had very very heavy periods low ferritin and often extreme exhaustion when she had her periods. It took 6 years, 2 pediatricians, and 5 OBGYNs before someone finally tested her clotting factors and she turned out to have very mild hemophilia A. They did some extensive testing which included chromogenic testing because her version was so mild and masked by the birth control pills that she had been prescribed at a very young age for her heavy periods. (She actually had to stop taking the birth control pills for over 3 months before the tests showed any meaningful results). It was important to know her diagnosis because it can become a serious problem in what's called a hemostatic challenge like having your wisdom teeth out or giving birth. Otherwise it's just been a relief to know what was causing the heavy periods and she now has been prescribed tranexamic acid for her periods, in addition to birth control pills (which helps a lot) and wears a medical ID bracelet.
Ps This was a spontaneous mutation as we have no family history of Hemophilia on either side

@user1471505356 many thanks for your reply. My first big worry obviously was something like leukaemia etc , is anything pointing to that diagnoses?
@yikesanotherbooboo thank you, yeah I won’t speak to the gp for another 3 weeks so sitting here worrying, thank you for reassuring.

Also ordered her some Iron supply for meanwhile, obviously it won’t be a full high ferritin she may need from GP but for now until she sees them ( 7mg with vitamin C daily)

• meant to say full iron tablets from gp.

As far as leukaemia is concerned ; it is a disease of abnormal white blood cells. Her full blood count includes red cells , white cells and platlets and no mention has been made of abnormal white cells so that has been discounted.