The aim of the study is to assess the association between the calcium and phosphorus balance and the stage of kidney disease measured by creatinine clearence in patients with chronic kidney disease stage 4 and 5. The balance is measured a measurement between the recorded diatery intake and the urinary excretion. Additionally a comparison between image based diatery accessment and weighted records will be measured
All participants will be asked to take photos of all the food and fluids they consume during 24 hours. Additionally participants will be offered to weight their food and fluid for 3 days.
Study Type
OBSERVATIONAL
Enrollment
50
Copenhagen University Hospital - Herlev
Herlev, Capital Region, Denmark
ACTIVE_NOT_RECRUITINGHerlev Hospital, Dept Nephrology
Herlev, Denmark
RECRUITINGComparison of diatery photograph method with weighted records.
The intake of calcium and phosphate assesed by the 24 hour photos and the 72 hour weighing of food and fluid items will be compared.
Time frame: 3 days
Calcium and phosphate balance in relation to the stage of kidney disease
Measured by the diatery intake of calcium and phosphate in relation to the urinary calcium and phosphate excretion
Time frame: 3 days
Urinary Calcium
mmol/day
Time frame: 3 days
Urinary phosphate
mmol/day
Time frame: 3 days
Calcium intake total and the distribution of vegetarian and animal sources
mg/day
Time frame: 3 days
Phosphate intake total and the distribution of vegetarian and animal sources
mg/day
Time frame: 3 days
sodium intake total and the distribution of vegetarian and animal sources
mg/day
Time frame: 3 days
Energy intake
Kcal/day
Time frame: 3 days
Protein intake
g/day
Time frame: 3 days
Fat intake
g/day
Time frame: 3 days
Fluid intake
ml/day
Time frame: 3 days
Plasma phosphate
mmol/l
Time frame: 3 days
Plasma calcium
mmol/l
Time frame: 3 days
Urinary creatinine
mmol/day
Time frame: 3 days
Urinary urea
mmol/day
Time frame: 3 days
Urinary sodium
mmol/day
Time frame: 3 days
Plasma FGF23
mmol/l
Time frame: 3 days
P-calcium P- phosphate product
Can be calculated by multiplying plasma calcium and plasma phosphate
Time frame: 3 days
plasma 25-OH-Vitamin D
nmol/l
Time frame: 3 days
plasma PTH
pmol/l
Time frame: 3 days
Plasma Albumin
g/dl
Time frame: 3 days
eGFR
ml/min/1.73m2
Time frame: 3 days
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