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You receive a phonecall from the biochemistry lab. They report the blood results of Eddie Blane, a gentleman who was admitted earlier today. They read out to you:

• Na 139 (135-145)

• K 6.8 (3.5-4.9)

• Urea 48 (6-12)

• Creat 389 (60-110)

What is your first step?