Blood Tests for Heavy Periods: What to Run and Why

Heavy menstrual bleeding, also known as menorrhagia, is a common concern for many women. It can significantly impact daily life and may indicate underlying health issues. Blood tests can play a crucial role in diagnosing the cause of heavy periods and guiding treatment.

What is heavy menstrual bleeding?

Heavy menstrual bleeding is defined as losing 80 milliliters or more of blood during a menstrual cycle or having periods that last longer than seven days. While it can be challenging to measure blood loss precisely, signs include soaking through one or more sanitary pads or tampons every hour for several consecutive hours, needing to use double sanitary protection, and having to change pads or tampons during the night.

Why blood tests are important

Blood tests help identify or rule out conditions that may contribute to heavy menstrual bleeding. These tests can detect anemia, which is a lack of healthy red blood cells, as well as assess your hormone levels and check for blood clotting disorders. Understanding these factors can help your healthcare provider decide on the most appropriate treatment.

Key blood tests for heavy periods

Complete Blood Count (CBC)

A CBC measures the levels of different cells in your blood, including red blood cells, white blood cells, and platelets. This test can reveal if you have anemia, which is common in those with heavy menstrual bleeding. Anemia can cause fatigue and weakness, as your body is not getting enough oxygen.

Ferritin

Ferritin is a protein that stores iron in your body. Low ferritin levels can indicate iron deficiency, which is often a result of prolonged heavy menstrual bleeding. Iron is crucial for producing hemoglobin, the part of red blood cells that carries oxygen.

Thyroid Function Tests

Thyroid hormones regulate many body functions, including menstruation. An imbalance in thyroid hormones can lead to heavy periods. Tests such as TSH (thyroid-stimulating hormone) can help determine if your thyroid is functioning properly.

Coagulation Tests

These tests assess how well your blood clots. Conditions like von Willebrand disease or other clotting disorders can cause heavy menstrual bleeding. Tests may include PT (prothrombin time) and aPTT (activated partial thromboplastin time).

Frequently asked questions

What causes heavy menstrual bleeding? Heavy menstrual bleeding can be caused by hormonal imbalances, uterine fibroids, polyps, certain medications, or blood clotting disorders.

How is heavy menstrual bleeding diagnosed? Diagnosis may include a physical examination, medical history review, blood tests, and possibly imaging tests like an ultrasound.

Can diet affect heavy menstrual bleeding? While diet alone may not cause heavy periods, maintaining a balanced diet rich in iron can help manage symptoms and prevent anemia.

Are heavy periods a sign of menopause? Heavy periods can occur during perimenopause, the transition phase before menopause, due to hormonal changes.

Is heavy menstrual bleeding a common issue? Yes, many women experience heavy periods at some point in their lives. It is a common reason for seeking medical advice.

When to see a doctor

You should consider seeing a doctor if your periods are so heavy that they interfere with your daily activities, if you experience symptoms of anemia such as fatigue or shortness of breath, or if you have periods that last longer than seven days consistently. Consulting with a healthcare provider can help determine the cause and appropriate treatment.

Remember, this information is intended to inform and is not a substitute for professional medical advice. Always discuss your symptoms and treatment options with your healthcare provider.