Blood test explanation - Cardiac tests

Cardiac tests

Test	Patient type		Lower limit	Upper limit	Unit	Comments
Creatine kinase (CK)	male	24,[48] 38,[7] 60[45]	174,[15] 320[45]	U/L or ng/mL
		0.42[49]	1.5[49]	µkat/L
	female	24,[48] 38,[7] 96[15]	140,[15] 200[45]	U/L or ng/mL
		0.17[49]	1.17[49]	µkat/L
CK-MB		0	3,[7] 3.8,[3] 5[45]	ng/mL or μg/L[3]
Myoglobin	Female	1[50]	66[50]	ng/mL or µg/L
	Male	17[50]	106[50]

Cutoffs and ranges for troponin types, 12 hrs after onset of pain
Test	Lower limit	Upper limit	Unit	Comments
Troponin-I		0.2[51]	ng/mL or μg/L	Upper limit of normal
	0.2[51]	1.0[51]	ng/mL or μg/L	Acute Coronary Syndrome
	0.4[52]	2.0[52]	ng/mL or μg/L	Moderately increased[52]
	1.0,[51] 1.5[53]	n/a[51][53]	ng/mL or μg/L	Myocardial Infarction likely
Troponin-T		0.02[51]	ng/mL or μg/L	Upper limit of normal
	0.02[51]	0.10[51]	ng/mL or μg/L	Acute Coronary Syndrome
	0.10[51]	n/a[51]	ng/mL or μg/L	Myocardial Infarction likely

Brain natriuretic peptide (BNP) -more detailed ranges in BNP article
Interpretation	Range / Cutoff
Congestive heart failure unlikely	< 100 pg/mL[54][55]
"Gray zone"	100-500 pg/mL[54][55]
Congestive heart failure likely	>500 pg/mL[54][55]

NT-proBNP -more detailed ranges in NT-proBNP article
Interpretation	Age	Cutoff
Congestive heart failure likely	< 75years	> 125 pg/mL[49]
	>75 years	>450pg/mL[49]