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Test Code CREA Creatinine with Estimated GFR (MDRD), Plasma or Serum

Additional Codes

LAB66

Collection Method

Venous collection

Minimum Volume

0.5ml

Container

Lt Green / Plasma Separator / Lithium Heparin

Acceptable Specimens

Serum:

  • Gold Top SST
  • Red Top


Plasma:

  • Light Geen Top (lithium heparin)

Reference or Target Ranges

Age Male Female

0 days up to 7 days

 0.2-1.1 0.2-1.1
7 days up to 2 months 0.1-0.6 0.1-0.6

2 months up to 2 years

 0.1-0.5 0.1-0.5
2 years up to 10 years 0.1-0.7 0.1-0.6
10 years up to 14 years 0.3-0.9 0.2-0.8
>14 years 0.7-1.30 0.5-1.10

 

  • GFR = 175 X (CREAT)^-1.154 X (AGE)^-0.203 X (0.745 IF FEMALE) X (1.210 IF AA)
  • eGFRcr = 142 x min(Scr/κ, 1)α x max(Scr/κ, 1)-1.200 x 0.9938Age x 1.012 [if female]

where:

Scr = standardized serum creatinine in mg/dL

κ = 0.7 (females) or 0.9 (males)

α = -0.241 (female) or -0.302 (male)

min(Scr/κ, 1) is the minimum of Scr/κ or 1.0

max(Scr/κ, 1) is the maximum of Scr/κ or 1.0

Age (years)

Reportable Units

mg/dL

Critical Value

Not defined for this assay

Reasons for Rejection

Hemolysis Threshold 800 mg/dL
Icterus Threshold

5 mg/dL conjugated

10 mg/dL unconjugated
Lipemia Threshold 1000 mg/dL
Other QNS, contaminated, improperly Labeled, improper specimen type

Specimen Stability

Ambient 7 days
Refrigerated (4°C to 8°C) 7 days
Frozen(-40°C to 0°C) 3 months

Performance Information

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

CPT Codes

82565

Last review/edit date

2025