To what pH should urine be acidified for Ca, Mg, PHOS testing?

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Multiple Choice

To what pH should urine be acidified for Ca, Mg, PHOS testing?

Keeping the urine strongly acidic prevents the formation and precipitation of calcium and magnesium phosphates in the sample. When the pH is not sufficiently acidic, these salts can come out of solution and settle, which would make the measured levels appear falsely low. By acidifying to a roughly 1.5 to 5.0 pH range, the ions remain dissolved and available for accurate analysis. A neutral or basic pH would promote precipitation, while the chosen acidic window provides the needed stability without requiring an extremely strict or narrow value. Hence, the broad acidic range is the best choice for these tests.

Keeping the urine strongly acidic prevents the formation and precipitation of calcium and magnesium phosphates in the sample. When the pH is not sufficiently acidic, these salts can come out of solution and settle, which would make the measured levels appear falsely low. By acidifying to a roughly 1.5 to 5.0 pH range, the ions remain dissolved and available for accurate analysis. A neutral or basic pH would promote precipitation, while the chosen acidic window provides the needed stability without requiring an extremely strict or narrow value. Hence, the broad acidic range is the best choice for these tests.

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