Table 5. Revised recommended methods and reference intervals for serum and urine creatinine measurement.

Analyte	SI Units	Reference intervals
		Gender	Age	Interval
Serum creatinine	μmol/L		Prenatal (umbilical cord)	46 – 86
		newborn babies	0 – 14 days	27 – 81
		male, female	2 months ≤ 1 year	14 – 34
		male, female	1 y ≤ 3 y	15 – 31
		male, female	3 y ≤ 5 y	23 – 37
		male, female	5 y ≤ 7 y	25 – 42
		male, female	7 y ≤ 9 y	30 – 48
		male, female	9 y ≤ 11 y	28 – 57
		male, female	11 y ≤ 13 y	37 – 63
		male, female	13 y ≤ 15 y	40 – 72
		male	adults (18 – 74 y)	64 – 104
		female	adults (18 – 74 y)	49 – 90
Urine creatinine (24 hour urine sample)	mmol/24 hour	male, female	3 – 8 y	1.0 – 6.0
		male, female	9 – 12 y	1.5 – 12.5
		male, female	13 – 17 y	2.6. – 16.5
		male	adults	7.7 – 21.3
		female	adults	5.9 – 14.1
Urine creatinine (first morning sample)	mmol/L	male	adults	3.5 – 22.9
		female	adults	2.5 – 19.2
y – years. (Reproduced and adapted with the permission of Croatian Chamber of Medical biochemists, document in Croatian. Available at: http://www.hkmb.hr/obavijesti/arhiva2010/arhiva_2010.html.)