When you go for your annual checkup, the doctor will typically take blood and urine samples ... for your creatinine levels to fluctuate due to factors such as muscle mass, age, and activity ...

The kidneys remove creatinine from your blood and send it into your urine ... lower levels of creatinine than non-pregnant ...

Calcium/ creatinine ratios were estimated in mmol/mmol (Reference 0,3-2,2 mmol/mmol). Fourteen preterm born infants (gestational age < 34 weeks) were more than two weeks old at the time of urine ...