How do I convert milliequivalents per liter (meq/l) to nanomoles per liter (nmol/l)?

Converting mEq/L to nmol/L

To convert milliequivalents per liter (mEq/L) to nanomoles per liter (nmol/L), you must multiply by the valence of the ion and then by 1,000 (to convert from moles to nanomoles).

Conversion Formula

• The basic conversion formula is: nmol/L = mEq/L × (1,000/valence) 1
• For monovalent ions (Na+, K+, Cl-, etc.) with a valence of 1, the formula simplifies to: nmol/L = mEq/L × 1,000 1
• For divalent ions (Ca2+, Mg2+, etc.) with a valence of 2, the formula becomes: nmol/L = mEq/L × 500,000 1

Step-by-Step Conversion Process

1. Identify the ion's valence (charge):

   • Monovalent ions (Na+, K+, Cl-, F-, etc.) have a valence of 1 2
   • Divalent ions (Ca2+, Mg2+, etc.) have a valence of 2 3

2. Apply the appropriate conversion factor:

   • For monovalent ions: multiply mEq/L by 1,000 1
   • For divalent ions: multiply mEq/L by 500,000 1

Examples

• For sodium (Na+), a monovalent ion:

  • 140 mEq/L = 140 × 1,000 = 140,000 nmol/L 1

• For calcium (Ca2+), a divalent ion:

  • 2.5 mEq/L = 2.5 × 500,000 = 1,250,000 nmol/L 1

Important Considerations

• The conversion factor depends entirely on the valence (charge) of the ion 3
• For ions with higher valences (e.g., trivalent ions), divide 1,000 by the valence to get the appropriate conversion factor 3
• When converting between concentration units, always verify which ion you're working with, as the valence affects the calculation 4

Clinical Context

• In clinical practice, different electrolytes are commonly reported in different units, making conversions necessary 1
• For example, sodium and potassium are typically reported in mEq/L, while other measurements may be reported in mmol/L or mg/dL 1
• Understanding these conversions is essential for accurate interpretation of laboratory values and medication dosing 1