Admission serum phosphate levels predict hospital mortality

Area of Science:

• Clinical Chemistry
• Nephrology
• Cardiology

Background:

• Admission serum phosphate levels are a potential predictor of patient outcomes.
• Understanding these associations is crucial for optimizing patient care and management.

Purpose of the Study:

• To investigate the relationship between admission serum phosphate levels and in-hospital mortality.
• To identify specific phosphate level thresholds associated with increased mortality risk.

Main Methods:

• Analysis of data from 42,336 adult hospitalized patients between 2009 and 2013.
• Categorization of admission serum phosphate into six groups (mg/dL).
• Logistic regression analysis to determine odds ratios (OR) for in-hospital mortality.

Main Results:

• A U-shaped association was observed between serum phosphate levels and in-hospital mortality.
• Levels below 3.1 mg/dL and above 4.2 mg/dL were linked to higher mortality.
• Significantly elevated mortality risks (ORs ranging from 1.60 to 3.89) were found for phosphate levels <2.5 mg/dL and >4.2 mg/dL.

Conclusions:

• Admission serum phosphate levels outside the 3.1-4.2 mg/dL range are associated with increased in-hospital mortality.
• Patients with chronic kidney disease (CKD) and cardiovascular disease (CVD) exhibit the highest mortality risk with hyperphosphatemia (≥4.9 mg/dL).