Effects of storage on serum ionized calcium and pH from horses with normal and abnormal ionized calcium concentrations.

The research article investigates how storing horse serum at different temperatures affects calcium ion (Ca(I)) concentrations and pH levels, particularly in horse serum with abnormal Ca(I) concentrations. It concludes that cold storage can maintain the stability of the Ca(I) concentration for about a week, regardless of the horse’s health, and that pH can be accurately measured within the first few days.

Research Methodology and Parameters

• The study aimed to evaluate the stability of ionized calcium (Ca(I)) concentrations and pH levels in horse serum with both normal and abnormal Ca(I) concentrations.
• They stored these samples at various temperatures (40 degrees C and -10 degrees C) over different periods.
• This research is built upon previous findings that showed Ca(I) concentrations in serum collected from healthy horses remained stable for 10 days if stored at 40 degrees C.
• However, this study sought to determine if the same stability occurred in horse serum samples with abnormal Ca(I) concentrations.

Key Findings

• Across the study, they found that serum Ca(I) concentration remained stable for about 7 days, regardless of whether the storage was cold or frozen.
• The stability reduced significantly by day 14 when the serum was in frozen storage (-10 degrees C).
• On the other hand, the pH levels in the serum showed a significant increase by day 7 of cold storage and within 3 days of frozen storage.

Implications

• The results indicate that if horse serum is collected, handled, and stored under anaerobic conditions and kept cold or frozen, the Ca(I) concentration can be accurately measured for approximately a week after collection. This is regardless of the health status of the horse.
• However, in terms of pH measurement, accurate readings can be taken within 3 days of cold storage or 1 day of frozen storage. The pH value tends to increase past these periods according to the study findings.
• Such information can be useful in managing procedures for serum collection and storage, particularly for equine health and clinical testing laboratories.