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Test Code GFR Estimated GFR

Important Note

This is not an orderable test, nor is it performed by the laboratory.  It is an automatic calculation that occurs in CIS.  See description for more details.

Synonyms

eGFR

Estimated Glomerular Filtration Rate

Glomerular Filtration Rate

Estimated GFR (Expanded Schwartz)

Estimated GFR (CKD-EPI)

Description

The Estimated GFR (eGFR) is not a test performed by the laboratory, but is a calculation that occurs via a CIS rule.  The result displays on the patient's chart as either Estimated GFR (Expanded Schwartz) or Estimated GFR (CKD-EPI) depending on the patient's age (CKD-EPI is for patients age ≥ 18 years old). This is viewable in the Chemistry section in both CIS and PathNet (ORV flowsheet view).

 

The Estimated GFR value is created any time a serum Creatinine is performed by the laboratory AND there is an existing Dose Calc Height or Measured Height at the time the Creatinine test is performed.  BUN is required for the eGFR (Expanded Schwartz) formula, and must be collected at the same time as the Creatinine.  The rule will look back 60 days for a charted height on patients 6 months to 2 years of age, 90 days for patients 2 years to 12 years of age, and 365 days for patients 12 years and older.  If the patient's height is charted after the Creatinine and/or BUN is performed, the eGFR will not be calculated.

 

NOTE: If an eGFR value is incorrect due to erroneous height value, the medical team must correct the height entry prior to contacting the lab to initiate a recalculation of eGFR

 

Lab:  To correct the eGFR, "correct" the Creatinine result by adding a new result comment.

 

Note:  On 6/26/17, the eGFR (Expanded Schwartz) formula which requires both BUN and Creatinine replaced the eGFR (Schwartz Bedside) formula in CIS.

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