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What is the purpose of a complete blood chemistry analysis?

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Purposes of a complete blood chemistry include evaluating the effectiveness of a treatment plan, determining blood glucose level and establishing a good diet regimen. It is also part of a routine physical examination before surgery, according to WebMD.

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Complete blood chemistry measures levels of 20 substances in the blood such as calcium, potassium, blood glucose, phosphate and albumin. Doctors instruct patients to avoid foods rich in fat and alcohol nine to 12 hours before this blood test. A patient should inform his doctor of any medication in use because some medicines affect the results. The doctor draws a blood sample from a vein in the arm. Risks include a bruise and ongoing bleeding, especially in patients with bleeding disorders, states WebMD.

Patients should inform the doctor of blood clotting issues or if taking blood-thinning medication. Aspirin and Coumadin increase the risk of ongoing bleeding, says WebMD.

Symptoms such as muscle weakness, lethargy, seizures and dehydration in children indicate changes in electrolyte levels and require a complete blood chemistry analysis. This test determines how kidneys are functioning and the body's ability to absorb sugars. Determining chloride levels in the blood helps doctors ascertain acid-base imbalance in the blood. Blood chemistry levels also determine creatinine and blood urea nitrogen levels in the blood, according to KidsHealth.

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