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Table 2 Blood and urine sodium, creatinine, and osmolality, and FENa

From: Premature baby with extreme hyponatraemia (95 mmol per litre): a case report

Time, hrs Blood Urine FENa, %
Sodium, mmol/l Creatinine, μmol/l Osmolality, mosm/kg Sodium, mmol/l Creatinine, μmol/l Osmolality, mosm/kg
0 94 16 203/207a n/dc
4 112 20 n/ab 19 <880 160 n/a
9 116 24 238 n/d
23 128 20 258/265 n/d
27 127 21 265 93 1110 418 1.3
33 126 17 260 <10 <880 n/a n/a
47 133 17 274 178 980 465 2.3
72 131 34 261/268 37 <880 139 n/a
98 134 23 274 128 1610 440 1.3
  1. aIn italics - calculated osmolality
  2. bn/a – not available
  3. cn/d – not done