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Creatinine, serum; eGFR calculation
Within 1 day
Turnaround time is defined as the usual number of days from the date of pickup of a specimen for testing to when the result is released to the ordering provider. In some cases, additional time should be allowed for additional confirmatory or additional reflex tests. Testing schedules may vary.
Serum (preferred) or plasma
Red-top tube, green-top (heparin) tube, or lavender-top (EDTA) tube
Separate serum from cells within 45 minutes of collection.
Maintain specimen at room temperature.1
Hemolysis; improper labeling
The estimated glomerular filtration rate (eGFR) provides an assessment of the filtering capacity of the kidney. The eGFR is calculated from a serum creatinine using the CKD EPI equation.2 Aside from the serum creatinine, other variables required for the equation are sex, age, and race. The eGFR has been shown to be more accurate in estimating the glomerular filtration rate than a 24-hour urine collection for creatinine clearance.3 Among patients with chronic kidney disease (CKD), the eGFR is instrumental in determining the stage of disease according to the K/DOQI CKD classification.
*Each stage assumes the associated GFR level has been in effect for at least three months. Stages 1 to 5, with or without kidney disease, indicate chronic kidney disease.
Note: Determination of stages one and two (with eGFR >59 mL/minute/1.73 m2) requires estimation of kidney damage for at least three months as defined by structural or functional abnormalities of the kidney, manifested by either:
• Pathological abnormalities or
• Markers of kidney damage, including abnormalities in the composition of the blood or urine or abnormalities in imaging tests
All estimates of GFR based on serum creatinine will be less accurate for patients at the extremes of muscle mass (including frail elderly, critically ill, or cancer patients), those with unusual diets, and those with conditions associated with reduced secretion or extrarenal elimination of creatinine. Confirmatory tests with exogenous measured GFR or measured creatinine clearance should be performed for people in whom estimates based on serum/plasma/blood creatinine alone may be inaccurate.4
>59 mL/minute/1.73 m2
While a normal GFR in young adults is approximately 120−130 mL/minute/1.73 m2, it declines with age, and values <60 mL/minute/1.73 m2 for three months or more is defined as CKD. To determine the presence of proteinuria, low eGFR results may be followed up with albumin:creatinine ratio. An albumin:creatinine ratio >30 mg/g would be indicative of kidney damage.3
|Order Code||Order Code Name||Order Loinc||Result Code||Result Code Name||UofM||Result LOINC|
|100768||Glom Filt Rate, Estimated||45066-8||001370||Creatinine||mg/dL||2160-0|
|100768||Glom Filt Rate, Estimated||45066-8||100791||eGFR If NonAfricn Am||mL/min/1.73||88294-4|
|100768||Glom Filt Rate, Estimated||45066-8||100797||eGFR If Africn Am||mL/min/1.73||88293-6|
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The LOINC® codes are copyright © 1994-2021, Regenstrief Institute, Inc. and the Logical Observation Identifiers Names and Codes (LOINC) Committee. Permission is granted in perpetuity, without payment of license fees or royalties, to use, copy, or distribute the LOINC® codes for any commercial or non-commercial purpose, subject to the terms under the license agreement found at https://loinc.org/license/. Additional information regarding LOINC® codes can be found at LOINC.org, including the LOINC Manual, which can be downloaded at LOINC.org/downloads/files/LOINCManual.pdf