What is the reference range for serum calcium?

Prepare for the CAMLPR Chemistry Test. Enhance your understanding with interactive quizzes, flashcards, and detailed explanations. Boost your confidence and readiness for exam success!

Multiple Choice

What is the reference range for serum calcium?

Calcium in the blood is normally kept within a narrow range. For total serum calcium, a typical reference range in adults is about 2.2–2.6 mmol/L (roughly 8.8–10.4 mg/dL). Among the given options, the range that best matches this common standard is 2.20–2.80 mmol/L. The lower end around 2.20 mmol/L fits the normal minimum, while the upper end near 2.80 mmol/L aligns with what some laboratories consider the higher end of normal. The other ranges either sit too low or push the upper limit too high to represent a normal population, which would misclassify normal results. Note that some labs report slightly different ranges, and ionized calcium alone sits a bit lower (about 1.1–1.3 mmol/L), but total calcium is what’s typically used for screening.

Calcium in the blood is normally kept within a narrow range. For total serum calcium, a typical reference range in adults is about 2.2–2.6 mmol/L (roughly 8.8–10.4 mg/dL). Among the given options, the range that best matches this common standard is 2.20–2.80 mmol/L. The lower end around 2.20 mmol/L fits the normal minimum, while the upper end near 2.80 mmol/L aligns with what some laboratories consider the higher end of normal. The other ranges either sit too low or push the upper limit too high to represent a normal population, which would misclassify normal results. Note that some labs report slightly different ranges, and ionized calcium alone sits a bit lower (about 1.1–1.3 mmol/L), but total calcium is what’s typically used for screening.

More practice questions