A patient taking furosemide has a blood test done that indicates low levels of parathyroid hormone. The pharmacist reminds the physician this is common for patients on furosemide, and does not indicate hypothyroidism. What does this indicate instead?

Furosemide can affect a laboratory test result, so a low parathyroid hormone reading in this context may reflect a drug-laboratory interaction rather than a separate disorder. It is not an allergic reaction or an interaction between two drugs.

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