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Test Code CK RF CKMB CK, REFLEX CK-MB 

Additional Codes

LAB13352

Performing Laboratory

Central Peninsula Hospital

Collection Method

Venipuncture

Container

Lt Green / Plasma Separator / Lithium Heparin

Specimen Type

Preferred

  • Plasma- Light Green Top (Lithium heparin)

 

Acceptable

  • Serum- Gold Top SST or Red Top

Minimum Volume

0.5ml

Specimen Stability

CK

Ambient 2 days
Refrigerated (4°C to 8°C) 7 days
Frozen(-40°C to 0°C) 4 weeks

 

CKMB

Ambient 5 hours
Refrigerated (4°C to 8°C) 12 hours
Frozen(-40°C to 0°C) 3 months

Reference or Target Ranges

CK Reference Range

Age Female
<21 days 0-600 U/L
3 weeks to 3 months 0-440 U/L
3 months up to 18 years 26-192 U/L
18 years and up 34-145 U/L

 

Age Male
<21 days 0-600 U/L
3 weeks to 3 months 0-440 U/L
3 months up to 18 years 39-308 U/L
18 years and up 46-171 U/L

 

CKMB Reference Range

 

Age Male Female
all ages 0-7.7 ng/mL 0-4.3 ng/mL

 

Creatine Kinase Index

CK-MB index reference range ≤3.0%

  • CK-MB index calculation = (CK-MB) x100 / (total CK activity)

Reportable Units

CK U/L
CKMB ng/mL
CK-MB INDEX %

 

 

Critical Value

Not defined for this assay

Reasons for Rejection

Hemolysis Threshold CK: 100 mg/dL
CKMB: 1000 mg/dL
Icterus Threshold CK: 60 mg/dL
CKMB: 34 mg/dL
Lipemia Threshold CK: 1000 mg/dL
CKMB: 1500 mg/dL
Other QNS, contaminated, improperly labeled, improper specimen type

Performance Information

Days and Time Performed 24/7
Expected Turn Around Time Stat: 1 hour
Routine: 4 hours
Stat Availabilty Yes
Performing Bench CPH Chemistry
Methodology/Method Description Roche Cobas

Reflex Testing

Reflex Criteria- Reflex from CK to CK-MB

 

Female

Age Range Low High
<21 days N/A >600
3 weeks to 3 months N/A >440
3 months up to 18 years <26 >192
18 years and up <34 >145

 

Male

Age Range Low  High
<21 days N/A >600
3 weeks to 3 months N/A >440
3 months up to 18 years <39 >308
18 years and up <46 >171

 

CPT Codes

CK, REFLEX CK-MB - 82550

CK-MB - 82553

Last review/edit date

2025