Allen's test
assess for circulation to hand via both ulnar and radial arteries.
Pt squeezes hand in fist for 30 seconds. occlude both arteries with fingers, pt opens hand (should be blanched). release arteries, color should return in <7 seconds (positive)
If negative, arteries are not patent, don't poke!
specific gravity of urine
the ratio of density of urine to density of water
water =1.000
SG = 1.002-1.03
normal phosphorous level
2.5-4.5
Central Venous Pressure (CVP)
direct measurement of the blood pressure in the right atrium and vena cava
Normal =4-11 cm H20