Dry lab

Question 1

Urine flow rate calculation

Answer 1

UF= Urine volume/ Time of collection

150 ml/ 300 min= .5 ml/min

Question 2

Renal clearance

Answer 2

Of a sucstance= volume of plasma thats completely cleared of the substance by the kidneys/ unit time

Cx= (Ux) x (UF)/ Px
Cx= clearance of substance X
Ux= urine concentration of X
UF= urine flow rate
Px= Plasma concentration of X

Question 3

Osmolar clearance

Answer 3

Cosm= (Uosm x Volume) / Posm

(989 mOsm/L) x (.5 ml/ min)/ 292 mOSm/L
= 1.69 ml/min

Question 4

Free water clearance

Answer 4

Ch20 : the rate at which solute free water is excreted by the kidneys

Ch20 = Uf - C osm

.5 ml/min - 1.69 ml/ min
= -1.19 ml/min

Question 5

REnal excretion

Answer 5

Excretion rate of X= Ux x UF

Ux= urine concentration of substance X
UF = Urine flow rate (mEq/L= uEq /ml)

Question 6

Fractional Excretion

Answer 6

The percentage of sodium filtered by the kidney which is excreted in the urine

renal tubular REAB of sodium

FE na= (Una x UF)/ (Pna  x GFR)
Una, urinary concentration of sodium
P na, plasma concentration of sodium
UF, urine flow rate
GFR,