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Chronic low sodium

My mom has chronic low sodium. Blood work done on Sept 6 was 120 meq/L and yesterday's blood work showed slight increase of 124 meq/L. She takes 6 salt pills a day. 1 glass of electrolyte solution. Her chronic low sodium has resulted in muscle weakness in right arm, confusion. Taken to the ICU last week for that. Is there a way to administer Saline (0.9%) at home?. She also has hypothyroidism for which takes Thyroxine. I suspect (not a doctor) that she might have SIADH (Syndrom of Inappropriate Antidieurtic Hormone Secretion) which causes water retention. Is there a complete blood/urine panel we can do investigate the reason for low sodium.
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Doctor Answers (1) on Chronic low sodium

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Dr. Ameet Thakkar Mumbai | General Physician
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The following laboratory tests may be helpful in the diagnosis of SIADH: Serum sodium, potassium, chloride, and bicarbonate Plasma osmolality Serum creatinine Blood urea nitrogen Blood glucose Urine osmolality Serum uric acid Serum cortisol Thyroid-stimulating hormone ALSO The basic diagnostic criteria is as under: Laboratory findings in diagnosis of SIADH include: Euvolemic hyponatremia <134 mEq/L, and POsm <275 mOsm/kg OR (POsm - Serum [Urea]mmol/l < 280 mOsm/kg ) Urine osmolality >100mOsm/kg of water during hypotonicity. Urine sodium concentration >40 mEq/L with normal dietary salt intake.
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