Do You Need a Blood Test For Hair Loss?

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Timestamps

If you’re losing your hair, blood work can be the difference between “I tried everything” and finally understanding why results aren’t happening. William Gaunitz explains that early in his practice he didn’t think everyone needed testing—until he saw cases where strong protocols still didn’t work. That’s when testing revealed that many people have underlying issues that must be identified and corrected in order to get the best outcomes.

He also points out that “getting blood tests” is vague—there are many possible tests, and which tests you get (and what your levels are) matters. His baseline recommendation is to start with the three fundamentals in any situation: Vitamin D3, zinc, and ferritin.

From there, the transcript explains when to expand testing:

If hair loss is happening on the top of the scalp, consider testosterone and estradiol to understand your estrogen-to-testosterone ratio and how that may relate to DHT being manageable.
If you have itching, burning scalp irritation, loss along the sides, or fast loss on the top, add tests like CBC, lipid & metabolic panel, thyroid panel, and ANA to look for inflammation, underlying conditions, or thyroid issues that need to be addressed.

The core message: people often rush into treatments like minoxidil, low-level laser therapy, PRP, and get no result, moderate results, or sometimes worse—when getting the right blood work up front can help you prioritize what to fix first so you can get the best results possible over the long term.

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Do You Need a Blood Test For Hair Loss?

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