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Creatinine Serum Test

A Creatinine Serum Test is a renal function test, providing a rough approximation of glomerular filtration.
Sample Report

Test Code: 001370

Also Known As: Creat

Methodology: Kinetic Jaffe

Preparation: No special preparation required.

Test Results: 2-3 days. May take longer based on weather, holiday or lab delays.

Sample Report

Test Code: 375

Also Known As: Creat

Methodology: Spectrophotometry (SP)

Preparation: No special preparation required.

Test Results: 1-2 days. May take longer based on weather, holiday or lab delays.

Description

Serum creatinine level is proportional to lean body muscle mass, unaffected by most diet or activity, and is freely filtered by the glomerulus. Both creatinine and BUN are often ordered to follow renal problems. Creatinine overall is the more reliable index, but each has pitfalls. As creatinine increases in chronic renal failure, the hematocrit decreases, total carbon dioxide and bicarbonate fall, and BUN and serum phosphate increase. When serum creatinine increases postoperatively, patients may be identified who are at risk for more severe renal failure. Creatinine clearances are useful in such investigations.

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