There's no single blood test that definitively diagnoses hair loss. However, several blood tests can help identify underlying medical conditions that contribute to hair loss.
Common Blood Tests for Hair Loss:
- Complete Blood Count (CBC): Checks for anemia, which can cause hair loss.
- Thyroid Stimulating Hormone (TSH): Detects thyroid problems, such as hypothyroidism or hyperthyroidism, which can also lead to hair loss.
- Iron Studies: Measures iron levels, ferritin, and transferrin saturation, which can indicate iron deficiency anemia.
- Vitamin D Levels: Low vitamin D levels have been linked to hair loss in some cases.
- Testosterone Levels: High levels of testosterone in women can cause hair loss.
- Lupus Antibodies: Detects lupus, an autoimmune disease that can cause hair loss.
- Biotin Levels: A deficiency in biotin can sometimes contribute to hair loss.
When to Consider Blood Tests for Hair Loss:
Your doctor may recommend blood tests if you experience:
- Sudden or patchy hair loss: This could signal an underlying medical condition.
- Excessive hair shedding: Losing more than 100 hairs per day is considered excessive.
- Other symptoms: Along with hair loss, you may experience fatigue, weight changes, or skin changes.
It's important to note that blood tests are just one part of diagnosing hair loss. Your doctor will also consider your medical history, physical exam, and scalp examination.
