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A B C D E F G H I J K L M N O P Q R S T U V W X Y Z # |
Creatinine
Test Code38448
CPT Codes
82565<br>Limited Access Code
Preferred Specimen
1 mL serum collected in a serum separator tube (SST)
Minimum Volume
0.5 mL
Other Acceptable Specimens
Plasma collected in a sodium heparin or lithium heparin (green-top) tube, or plasma separator tube (PST)
Instructions
Centrifuge serum specimens within 1 hour of collection, transfer serum to a sterile, plastic screw-capped vial(s), ship at room temperature.
Transport Container
Sterile, plastic screw-cap vial
Transport Temperature
Room temperature
Specimen Stability
Room temperature: 7 days
Refrigerated: 7 days
Frozen: 28 days
Refrigerated: 7 days
Frozen: 28 days
Reject Criteria (Eg, hemolysis? Lipemia? Thaw/Other?)
Grossly icteric • Anticoagulants other than heparin
Methodology
Spectrophotometry
Setup Schedule
Set up: Daily; Report available: Next day
Reference Range
Age | Male (mg/dL) | Female (mg/dL) |
0-2 days | 0.79-1.58 | 0.79-1.58 |
3-27 years | 0.35-1.23 | 0.35-1.23 |
1 month-9 years | 0.20-0.73 | 0.20-0.73 |
10-12 years | 0.30-0.78 | 0.30-0.78 |
13-15 years | 0.40-1.05 | 0.40-1.00 |
16-17 years | 0.60-1.20 | 0.50-1.00 |
18-19 years | 0.60-1.24 | 0.50-0.96 |
20-29 years | 0.60-1.24 | 0.50-0.96 |
30-39 years | 0.60-1.26 | 0.50-0.97 |
40-49 years | 0.60-1.29 | 0.50-0.99 |
50-59 years | 0.70-1.30 | 0.50-1.03 |
60-69 years | 0.70-1.35 | 0.50-1.05 |
70-79 years | 0.70-1.28 | 0.60-1.00 |
> or = 80 years | 0.70-1.22 | 0.60-0.95 |
Clinical Significance
Serum creatinine is useful in the evaluation of kidney function and in monitoring renal dialysis. A serum creatinine result within the reference range does not rule out renal function impairment: serum creatinine is not sensitive to early renal damage, since it varies with age, gender, and ethnic background. The impact of these variables can be reduced by an estimation of the glomerular filtration rate, using an equation that includes serum creatinine, age, and gender.