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An expected creatinine concentration indicates that the test sample is undiluted, whereas low amounts of creatinine in the urine indicate either a manipulated test or low initial baseline creatinine concentrations. Test samples considered manipulated due to low creatinine are not tested, and the test is sometimes considered failed.
One of the measures of kidney function is the glomerular filtration rate (GFR). Other tests that can assess the function of the kidneys include assessment of electrolyte levels such as potassium and phosphate, assessment of acid-base status by the measurement of bicarbonate levels from a vein, and assessment of the full blood count for anaemia.
An elevated creatinine level is considered abnormal and may indicate decreased kidney function. [ 31 ] Blood urea nitrogen (BUN) - Also measured using a BMP or CMP , blood urea nitrogen is an indicator of how much nitrogen is in the blood at the time of the phlebotomy.
The age term is (140 – age). This means that a 20-year-old person (140 – 20 = 120) will have twice the creatinine clearance as an 80-year-old (140 – 80 = 60) for the same level of serum creatinine. The C-G equation assumes that a woman will have a 15% lower creatinine clearance than a man at the same level of serum creatinine.
The word “renal” is an adjective meaning “relating to the kidneys”, and its roots are French or late Latin. Whereas according to some opinions, "renal" should be replaced with "kidney" in scientific writings such as "kidney artery", other experts have advocated preserving the use of "renal" as appropriate including in "renal artery".
The use of TMP/SMX also raises concerns in patients with kidney disease. In patients with creatinine clearance less than 50 mL/min, the urine concentrations of SMX may decrease to subtherapeutic levels. Therefore, in patients with low creatinine clearance, it is recommended to prescribe a reduced dosage of TMP alone. [30]
A creatinine of 0.7 mg/dL is normal for a small frail woman. A level of 2.0 mg/dL would indicate severe kidney disease in the old woman. The more muscle mass you have, and the more you use those muscles, the more more creatinine you should excrete. A frail old woman is expected to have very low creatinine levels.
Often, it is diagnosed on the basis of blood tests for substances normally eliminated by the kidney: urea and creatinine. Additionally, the ratio of BUN to creatinine is used to evaluate kidney injury. Both tests have their disadvantages. For instance, it takes about 24 hours for the creatinine level to rise, even if both kidneys have ceased to ...