Which lab is MOST appropriate to order in suspected fibromyalgia?

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Multiple Choice

Which lab is MOST appropriate to order in suspected fibromyalgia?

Explanation:
In suspected fibromyalgia, you don’t have a single diagnostic lab; the goal is to rule out other conditions that can mimic the symptoms. A key mimicker to check for is hypothyroidism, because fatigue, muscle aches, weight changes, and cognitive difficulties overlap with fibromyalgia. Testing thyroid function with a TSH directly assesses this common reversible cause, and an abnormal result would steer management toward treating thyroid disease rather than fibromyalgia. The other tests (CBC, CMP, ANA) can help exclude other issues or autoimmune diseases, but they’re not as targeted for ruling out the most common alternative explanation of the symptoms.

In suspected fibromyalgia, you don’t have a single diagnostic lab; the goal is to rule out other conditions that can mimic the symptoms. A key mimicker to check for is hypothyroidism, because fatigue, muscle aches, weight changes, and cognitive difficulties overlap with fibromyalgia. Testing thyroid function with a TSH directly assesses this common reversible cause, and an abnormal result would steer management toward treating thyroid disease rather than fibromyalgia. The other tests (CBC, CMP, ANA) can help exclude other issues or autoimmune diseases, but they’re not as targeted for ruling out the most common alternative explanation of the symptoms.

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