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Table 1 Sliding-scale fluid prescription given to the parents to adjust daily fluid prescription according to the home blood sodium result

From: Home blood sodium monitoring, sliding-scale fluid prescription and subcutaneous DDAVP for infantile diabetes insipidus with impaired thirst mechanism

Blood Sodium (mmol/L) Daily Fluid Prescription (mls)*  
Below 130 100 Telephone and go to ED for assessment
130-134 500 Repeat sodium level before PM dose
135-139 800 Repeat sodium level before PM dose
140-145 1,200 Sodium is in target range
146-150 1,350 Repeat sodium level before PM dose
151-155 1,500 Repeat sodium level before PM dose
Over 155 1,800 Telephone and go to ED for assessment
  1. Parents were instructed to telephone the Paediatric Endocrine department and attend the emergency department (ED) if levels were below 130 or over 150 mmol/L.
  2. *The fluid prescription is based on 1,200 ml maintenance fluids, with additions or subtractions based on the formula for calculating water deficit in ml (600 × wt(kg) × (1-target [Na]/measured [Na]). If the sodium is >150 mmol/L, the extra fluid above maintenance has been reduced by 25% to avoid excessively rapid correction.