From the Guidelines
The conversion factor for potassium from milliequivalents (mEq) to millimoles (mmol) is 1:1, as stated in the expert consensus document on the management of hyperkalaemia 1. This straightforward conversion is due to potassium's valence of +1, meaning one potassium ion carries one positive charge.
- The reason for this equivalence lies in the definition of an equivalent (Eq), which represents one mole of charge.
- Since potassium has a single charge per ion, the milliequivalent (mEq) and millimole (mmol) values are identical.
- This is crucial when interpreting laboratory values or calculating medication doses, especially in clinical practice where accurate electrolyte balance is vital.
- The 1:1 conversion factor is also important for understanding and managing hyperkalaemia, as defined by serum or plasma K+ > 5 mmol/L (or equivalently, > 5 mEq/L) 1.
- This simple relationship allows for the direct comparison and conversion of potassium values between different units, facilitating communication and care coordination across different healthcare settings and countries.
From the Research
Conversion Factor for Potassium
To convert potassium from milliequivalents (mEq) to millimoles (mmol), we need to consider the valence of potassium. Potassium has a valence of +1, which means that 1 mEq of potassium is equivalent to 1 mmol of potassium.
Calculation
- 1 mEq of potassium = 1 mmol of potassium
- The atomic weight of potassium is approximately 39.1 g/mol, but this information is not necessary for the conversion from mEq to mmol.
Evidence from Studies
There are no direct references to the conversion factor in the provided studies 2, 3, 4, 5, 6. However, the studies discuss the importance of potassium levels in various medical conditions, such as hypokalemia, heart failure, and hypertension.