Your Serum Sodium of 143 mmol/L is Normal
A serum sodium level of 143 mmol/L falls within the normal range (135-145 mmol/L) and does not represent hypernatremia, which is defined as serum sodium >145 mmol/L. 1, 2
Understanding Your Result
Your sodium level of 143 mmol/L indicates:
- Normal sodium balance - You are maintaining appropriate water and sodium homeostasis 1
- No immediate concern - This value requires no specific treatment or intervention 1
- Upper-normal range - While technically normal, it sits toward the higher end of the reference range (135-145 mmol/L) 2, 3
Clinical Context
What This Means
- Normal serum osmolality is maintained between 280-295 mOsm/kg, and your sodium level of 143 mmol/L is consistent with this range 2
- The body's integrated system involving thirst, antidiuretic hormone (ADH) secretion, and renal water excretion is functioning appropriately 4
- No neurological symptoms or complications are expected at this sodium level 5, 4
When to Be Concerned
Hypernatremia only becomes clinically significant when sodium exceeds 145 mmol/L, at which point it reflects an imbalance in water metabolism, typically from increased free water loss relative to sodium excretion 2, 3
Monitoring Recommendations
- Routine monitoring - If you have risk factors (elderly age, impaired thirst mechanism, diabetes insipidus, or are taking medications affecting water balance), periodic sodium checks may be warranted 2, 3
- Hydration status - Maintain adequate fluid intake, especially if you are elderly or have limited access to water 2, 6
- Clinical symptoms - Report any new symptoms of confusion, excessive thirst, or altered mental status to your healthcare provider 3
Special Populations Requiring Attention
If you fall into these categories, closer monitoring may be appropriate even with normal sodium:
- Elderly patients - Higher risk of developing hypernatremia due to impaired thirst sensation 6
- Patients with liver cirrhosis - Sodium levels approaching the upper normal range may signal worsening hemodynamic status 7
- Neurosurgical patients - May develop sodium disturbances from cerebral salt wasting or inappropriate ADH secretion 7
In summary, your sodium level of 143 mmol/L requires no intervention and represents normal physiology.