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Calcium adjustment equations in neonates and children
Nuthar Jassam1, Shireen Gopaul, Philip McShane
1Department of Clinical Biochemistry, Leeds Teaching Hospitals NHS Trust, and Department of Research & Development, Leeds University, Leeds, UK. nuthar.jassam@hdft.nhs.uk
Annals of Clinical Biochemistry
|April 27, 2012
Summary
The adult-adjusted calcium equation is reliable for children over one year old. For younger children, the adult equation shows a higher bias, indicating a need for age-specific adjustments in pediatric calcium measurements.
Area of Science:
- Clinical Chemistry
- Pediatric Endocrinology
Background:
- Blood calcium exists in free and protein-bound forms, with the ionized form being biologically active.
- Adjusted calcium, calculated using serum albumin, is standard for adults but its pediatric applicability is unclear.
- The study investigates the validity of adult-based adjusted calcium equations in pediatric populations.
Purpose of the Study:
- To evaluate the accuracy of the adult-adjusted calcium equation in children across different age groups.
- To determine if age-specific equations are necessary for pediatric adjusted calcium measurements.
- To assess the reliability of standard adjusted calcium calculations in pediatric care.
Main Methods:
- Retrospective analysis of laboratory data from three hospitals for patients aged 0-18 years.
- Patients with calcium homeostasis disturbances were excluded.
- Data were stratified into four age groups (0-1 month, 1 month-1 year, 1-5 years, 5-18 years) for regression analysis.
Main Results:
- An inverse relationship was observed between patient age and the bias of the adult-adjusted calcium equation.
- Younger children exhibited greater discrepancies between adult-adjusted and age-specific calcium values.
- This age-related bias was consistent across all participating hospital sites.
Conclusions:
- The adult-adjusted calcium equation is suitable for use in children aged one year and older.
- Age-specific adjusted calcium equations may be necessary for infants and very young children.
- Clinical laboratories can confidently use the adult equation for pediatric patients above one year of age.
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