Formulas and Measurements
Creatinine clearance
urine creatinine (mg/dl) x urine volume (mls/min) ΒΈ body weight
(kg)
serum creatinine (mg/dl)
N = 2-4 ml/min/kg
Fractional phosphate
excretion:
serum creatinine (mg/dl) X urine phosphorus (mg/dl)
urine creatinine (mg/dl) serum phosphorus (mg/dl)
N = 0.07 + .05
24 hour urine
protein quantitation:
urine volume (ml/24 hrs) X urine protein concentration (mg/dl)
100
N = 14 + 8 mg/kg/day dog
N = 17 + 9 mg/kg/day cat
Urine protein:creatinine
ratio
urine protein (mg/dl)
urine creatinine (mg/dl)
N <1
Water intake: 20-30 ml/lb/day
(44-66 ml/kg/day)
Urine output: 12-24 ml/lb/day
(20-44 ml/kg/day)
Insensible water loss:
1/2 ml/kcal/day (10-15 ml/lb/day)
Osmolality Calculation
Method one: 2 [Na+ (mEq/L)] + glucose (mg/dl) /18 +
urea nitrogen (mg/dl)/2.8
Method two: 1.86 [Na+ + K+] glucose (mg/dl)/18
+
urea nitrogen (mg/dl) / 2.8 +9
N = 280 - 310 mosmol/L
Adjusted serum calcium:
calcium (mg/dl) - albumin (mg/dl) + 3.5
Red Blood Cell Parameters
Mean corpuscular volume (MCV):
PCV x 10 = MCV (femtoliters)
RBC (millions)
N = 60 - 77 canine 39 - 53 feline
Mean corpuscular hemoglobin (MCH):
hemoglobin x 10 = MCH (picograms)
RBC (millions)
N = 19.5 - 24.5 canine 13-17 feline
Mean corpuscular hemoglobin concentration (MCHC):
hemoglobin x 100 = MCHC (g/dl)
PCV
N = 32 - 36 canine 30 - 36 feline
Absolute reticulocyte count
% reticulocytes x RBC (millions) = absolute count
> 70,000 indicates regeneration
Blood Volume:
40 mls/lb canine (90 ml/kg)
30 mls/lb feline (70 ml/kg)
Blood Transfusions:
| ml of blood = recipient wt(kg) x |
90 (dog) x |
desired pcv - recipient pcv |
|
70 (cat) |
donor PCV |
Fluid Deficit Calculation:
% deficit x body weight (kg) = liters of fluid to replace
Last Edited: Feb 14, 2008 11:06 AM
