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Creatinine CPT: 82565

Special Instructions

This test may exhibit interference when sample is collected from a person who is consuming a supplement with a high dose of biotin (also termed as vitamin B7 or B8, vitamin H, or coenzyme R). It is recommended to ask all patients who may be indicated for this test about biotin supplementation. Patients should be cautioned to stop biotin consumption at least 72 hours prior to the collection of a sample.

Expected Turnaround Time

Within 1 day

Specimen Requirements

Specimen

Serum

Volume

1 mL

Minimum Volume

0.5 mL

Container

Gel-barrier tube, red-top tube, green-top (heparin) tube, or lavender-top (EDTA) tube.

Collection

Separate serum or plasma from cells within 45 minutes of collection.

Storage Instructions

Maintain specimen at room temperature.

Stability Requirements

Patient Information

To evaluate the health of your kidneys; to help diagnose kidney disease; to monitor treatment for kidney disease.

Routinely as part of a comprehensive metabolic panel (CMP) or basic metabolic panel (BMP) when you have a health exam; when your have signs and symptoms that may be due to kidney disease or damage or when you have a condition that may affect your kidneys and/or be worsened by kidney dysfunction; at intervals to monitor treatment for kidney disease or kidney function while on certain medications.

A blood sample is drawn from a vein in your arm. A 24-hour urine sample may also be collected, in which all urine is saved for 24 hours. Sometimes a single, random urine sample may be collected and tested.

You may be instructed to fast overnight or refrain from eating cooked meat; some studies have shown that eating cooked meat prior to testing can temporarily increase the level of creatinine. If a 24-hour urine sample is being collected, it is important to save all the urine produced during that time period.