Creatinine (GFR)

Performing Lab: Central Lab, Hudson, Lakeview, Regions, Sartell, Westfields

3711

Sunquest: GFR; Glomerular Filtration Rate, Creatinine

Creatinine, GFR

0.1 mL Lithium Heparin Plasma (light green-top) tube

70 uL

Serum (gold-top, red-top, red/gray-top), Lithium Heparin (light green-top) on ICE

Refrgerated

Room Temperature (7 days), Refrigerated (7 days), Frozen (3 months)

Hospital: Daily
Clinics: Monday - Friday

Same day.

GFR and Creatinine both reported on patients >18 years
Creatinine only is reported on patients <18 years

 

Gender	Age	Ref. Range	Critical
Both	0 - 16 years	0.55 - 1.18 mg/dL	>=2.0 mg/dL
Female	>=16 years	0.55 - 1.02 mg/dL	>=7.0 mg/dL
Male	>=16 years	0.73 - 1.18 mg/dL	>=7.0 mg/dL

GFR (>=20 Years): >60mL/min/1.732
 

Serum creatinine and urinary creatinine excretion is a function of lean body mass in normal persons and shows little or no response to dietary changes. The serum creatinine concentration is higher in men than in women. Since urinary creatinine is excreted mainly by glomerular filtration, with only small amounts due to tubular secretion, serum creatinine and a 24-hour urine creatinine excretion can be used to estimate the glomerular filtration rate.

Serum creatinine is increased in acute or chronic renal failure, urinary tract obstruction, reduced renal blood flow, shock, dehydration, and rhabdomyolysis. Causes of low serum creatinine concentration include debilitation and decreased muscle mass.