Calcemic status of geriatric patients: a longitudinal study

Area of Science:

• Geriatric Medicine
• Clinical Chemistry
• Endocrinology

Background:

• Calcium homeostasis is crucial for elderly health.
• Accurate assessment of calcium status is vital in long-term geriatric care.
• Existing methods for calcium measurement may have limitations in this population.

Purpose of the Study:

• To evaluate the longitudinal stability of serum ionized calcium (CaI), total calcium (CaT), and albumin-corrected calcium (CaA) in geriatric long-term inpatients.
• To compare the reliability of CaI, CaT, and CaA in reflecting long-term calcemic status changes in the elderly.

Main Methods:

• Measurement of serum CaI, CaT, and CaA in 108 geriatric inpatients at baseline.
• Repeat measurements after a mean of 37 months.
• Analysis of longitudinal changes and interindividual variability.

Main Results:

• Mean CaI, particularly when pH-adjusted, demonstrated remarkable stability over the 37-month period.
• This stability suggests well-preserved calcemic homeostatic control in elderly patients, even in later years.
• CaT and CaA were found to be inferior to CaI for detecting subtle longitudinal changes in calcemic status.

Conclusions:

• Serum ionized calcium (CaI) is a reliable indicator of calcemic status in geriatric patients over time.
• Total calcium (CaT) and albumin-corrected calcium (CaA) measurements are less suitable for monitoring long-term calcium balance in the elderly.
• CaI offers a more accurate assessment of longitudinal calcemic changes compared to CaT and CaA in geriatric populations.