Na 152 mmol/L - elevated (normal range 134-146 mmol/L)

K+ 4.6 mmol/L (normal range 3.4-5.0 mmol/L)

Cr 180 µmol/L - elevated (normal range 60-120 µmol/L for adult males)

Mr Thomas is dehydrated and probably has substantial renal dysfunction which has not been recorded up until now.  This was worth checking!