Table 4.

Comparison of reference intervals for myocardial enzyme activity applied with similar detection systems and/or methodologies.

	This study				Other country research				Cao et al. [29]
	System/method	Age	Sex	RI	System/method	Age	Sex	RI	System/method	Age	Sex	RI
AST (U/L)	VITROS 5600/multipoint rate	1∼<7	M + F	22.7–51.9	VITROS 5600/rate [30]	1∼<7	M + F	33–66	VITROS 350/rate	3 m∼<3 y	M + F	23–60
		7∼<12	M	18.2–36.4		7∼<12	M + F	28–50		3 y∼<12 y	M + F	24–47
			F	16.0–33.8		12∼<18	M	24–49		12∼<18	M + F	17–47
		12∼<18	M	15.4–33.3			F	23–41
			F	13.7–26.6
LDH (U/L)	VITROS 5600/multipoint rate	1∼<7	M + F	434.9–737.7	Abbott ARCHITECT/rate [30]	1∼<10	M + F	309–1222	VITROS 350/rate	3 m∼<3 y	M + F	504–896
		7∼<12	M	408.8–663.7		10∼<15	M + F	163–452		3 y∼<12 y	M + F	491–790
			F	373.8–642.1		15∼<19	M + F	192–321		12∼<18	M + F	342–716
		12∼<15	M	364.8–641.0
		15∼<18	M	314.6–568.6
		12∼<18	F	315.7–554.9
CK (U/L)	VITROS 5600/multipoint rate	1∼<18	M	49.1–194.1	VITROS/rate [31]	13∼24 m	M	27–160	VITROS 350/rate	3 m∼<12 y	M + F	50–226
		1∼<7	F	41.0–166.5			F	24–175		12 y∼<18 y	M	47–256
		7∼<12	F	39.3–155.4		2∼14	M	30–150			F	34–235
		12∼<15	F	36.6–129.2		2∼10	F	24–175
		15∼<18	F	32.0–105.9		11∼14	F	30–170
						15∼18	M	33–145
							F	27–140
CKMB (U/L)	VITROS 5600/multipoint rate	1∼<7	M + F	11.4–38.9					VITROS 350/rate	3 m∼<6 y	M + F	18–44
		7∼<15	M	7.9–34.2						6 y∼<12 y	M + F	7–35
		7∼<12	F	7.4–30.7						12 y∼<18 y	M + F	7–28
		12∼<15	F	2.8–23.3
		15∼<18	F	2.7∗–15.5
		15∼<18	M	2.1–20.8

^∗Lowest detection limit. Actual values could be lower.