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**Non Orderable: GFR (Estimated Glomerular Filtration Rate) **

Important Note

Order Creatinine  : GFR is a calculation when running creatinines

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Lithium Heparin Gel

Specimen Requirements

Preferred:
Container/Tube: Mint Green Top (Lithium Heparin Gel)
Minimum Volume: 1.0 mL Serum
Collection Instructions: Centrifuge within 2 hours
Also Acceptable:
Container/Tube: Gold Top (SST-Gel)

Specimen Stability

Ambient: 8 hours
Refrigerate: 48 hours
Frozen: aliquot for longer storage

Methodology

Rate Jaffe

CPT

82565

Reference Ranges

Glomerular Filtration Rate                       

≥ 60

Normal or Mildly Decreased GFR

 mL/min/1.73M2 
 

30-59

Moderate decrease in GFR

  
 

15-29

Severe decrease in GFR

  
 

< 15

Kidney Failure or Dialysis

  
  Chronic kidney disease is defined as either kidney damage or GFR < 60 mL/min/1.73 m2 for ≥ 3 months. Kidney damage is defined as pathologic abnormalities or markers of damage including abnormalities in blood or urine tests or imaging studies.  This GFR is NOT used for medication dosing.