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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