In an illustrative case, a patient whose heavy bleeding began six months ago needs more than the question, “Do you bruise easily?” The family-medicine decision is whether her lifetime bleeding pattern supports targeted testing for von Willebrand disease (VWD)—and how to keep evaluating new uterine bleeding at the same time.
Consider a 32-year-old with previously manageable, regular periods that have become heavy enough to cause flooding at work. She reports fatigue and exertional shortness of breath; testing shows microcytic anemia and low ferritin. She is stable today, but symptomatic iron deficiency needs attention. Neither anemia nor the amount of menstrual bleeding, by itself, identifies the cause.
Read the timeline, then ask about hemostatic challenges
A new six-month change after years of usual periods makes an inherited bleeding disorder less immediately explanatory than heavy bleeding present since menarche. It does not rule one out. A patient may not recognize a bleeding tendency, may have had few prior hemostatic challenges, or may have another cause of bleeding alongside a disorder.
Ask about menstrual flow from the first periods onward, not just the current cycle. Then ask specifically about prolonged or excessive bleeding after childbirth, surgery, dental work, or injury; recurrent nosebleeds, gum bleeding, or large frequent bruises; and relatives with abnormal bleeding. A negative answer to easy bruising alone is not a complete bleeding history.
For a patient who has given birth or had surgery, the event is informative only if you ask what happened: Was there postpartum hemorrhage, unusual bleeding during recovery, reoperation, or a need for transfusion? G2P2 status and a prior tubal ligation do not, without that history, establish normal hemostasis.
| History pattern | How to interpret it | Practical next step |
|---|---|---|
| Heavy periods since menarche, especially with other mucosal bleeding or bleeding after a procedure or delivery | Raises suspicion for an inherited bleeding disorder | Use a validated bleeding-assessment tool and consider VWD-specific testing |
| Heavy bleeding began recently after previously typical periods, with no other bleeding clues | Makes an inherited disorder less likely, but does not exclude it | Evaluate acquired and gynecologic causes; complete a structured bleeding history |
| Irregular or infrequent cycles with heavy or prolonged flow | Makes ovulatory dysfunction more plausible | Assess the cycle pattern and order targeted tests when indicated |
For patients with a low pretest probability in primary care, a validated bleeding-assessment tool can help determine who needs specific VWD blood tests. When the personal or family history already creates stronger suspicion, do not use a low score as the sole reason to withhold testing; consultation with hematology may help guide the workup.
A normal PT or aPTT is not the end of the question
A CBC can identify anemia and thrombocytopenia, and PT/aPTT may be useful initial screening tests when a bleeding disorder is suspected. But normal PT and aPTT results do not reliably exclude VWD or every platelet-function disorder. A normal screening panel should not overrule a convincing history.
When the history warrants specific evaluation for VWD, the initial tests generally include von Willebrand factor (VWF) antigen, platelet-dependent VWF activity, and factor VIII activity. Results can be affected by the patient’s physiologic state: VWF may rise with stress, active bleeding, inflammation, or pregnancy. If testing during an episode is normal but clinical suspicion remains, discuss interpretation and possible repeat testing when the patient is at baseline with hematology or the testing laboratory.
Treat the problem in front of you while the evaluation proceeds. Iron deficiency is a consequence worth addressing, not evidence that the bleeding must be caused by a coagulopathy. Likewise, arranging appropriate tests should not delay follow-up for ongoing heavy bleeding or worsening anemia.
Keep the uterine evaluation moving
A bleeding-disorder workup and gynecologic evaluation are not competing paths. Causes in the PALM–COEIN framework can coexist. With a new change in bleeding, ask about medications and hormonal devices, confirm pregnancy status, and assess whether the pattern or symptoms suggest structural disease, ovulatory dysfunction, or another source.
For this patient, regular cycles do not eliminate structural or endometrial causes. Persistent symptoms may warrant pelvic imaging, often with ultrasound. At age 32, obesity is a relevant endometrial risk factor, but it does not by itself prove hyperplasia or make biopsy automatic; sampling decisions should also consider persistent bleeding, unopposed estrogen exposure, and response to treatment.
If the patient is anxious about a pelvic examination, explain what each part would help assess and agree on a plan together. Her preference does not prevent taking a careful bleeding history, treating iron deficiency, or arranging appropriate follow-up and imaging.
Common traps
- “She does not bruise, so VWD is unlikely.” Ask about periods since menarche, nose and gum bleeding, family history, and bleeding after procedures or delivery.
- “PT and aPTT are normal, so a bleeding disorder is ruled out.” These tests can be normal in VWD; interpret them alongside the history.
- “She has had pregnancies and surgery, so inherited bleeding is excluded.” Ask whether those events involved excessive bleeding before treating them as reassuring challenges.
- “Possible VWD explains the whole case.” Continue evaluating new or persistent uterine bleeding; more than one cause may be present.
Practical takeaways
- Let the lifetime bleeding pattern, not one symptom, guide the decision to test.
- In low-probability primary-care cases, use a validated bleeding-assessment tool; do not let a score override a compelling history.
- Normal PT/aPTT results do not rule out VWD. Specific testing uses VWF antigen, VWF activity, and factor VIII activity.
- Address iron deficiency and continue the gynecologic evaluation in parallel.
