![]() Please direct any questions regarding coding to the payer being billed. CPT coding is the sole responsibility of the billing party. Listed in this appendix are pediatric normal ranges for some of the more common hematology and chemistry tests along with the references from which they were obtained. The CPT codes provided are based on AMA guidelines and are for informational purposes only. In most cases of chronic renal disease, the ratio remains relatively normal. When there is decreased formation of urea, as seen in liver disease, there is a decrease in the BUN/Creatinine ratio. Increased urea formation also results in an increase in the ratio, e.g. congestive heart failure or recent onset of urinary tract obstruction, will result in an increase in BUN/Creatinine ratio. BUN (blood urea nitrogen): This substance builds up in the blood when the kidneys are not working normally. An eGFR higher than 60 means you have at least 60 kidney function. It drops to 85 mL/min/1.73m2 for people in their 60s. A higher than normal BUN level may be a sign that your kidneys are not working well. The average eGFR for someone in their 20s is about 116 mL/min/1.73m2. In general, about 7 - 20 mg/dL is a normal level. The rate naturally declines as you age and lose muscle mass. The main job of your kidneys is to remove waste and extra fluid from your body. A normal range is 20 mmol/L to 29 mmol/L. Values for eGFR vary depending on age, sex and other factors. Medical Tests BUN (Blood Urea Nitrogen) BUN (Blood Urea Nitrogen) What is a BUN (Blood Urea Nitrogen) Test A BUN, or blood urea nitrogen test, can provide important information about your kidney function. Please Note: If results for BUN and Creatinine are both within the normal reference range, the BUN/Creatinine ratio will not be reported (not applicable).Ĭlinical Significance: The BUN/Creatinine ratio is useful in the differential diagnosis of acute or chronic renal disease. CO2 (carbon dioxide): This helps measure the acid-base balance in the blood. To calculate the new eGFR from a previous Creatinine or Cystatin C result, go to. ![]() Creatinine is a waste product in the blood created by the normal metabolism of muscle cells. Other possible causes of an elevated BUN include dehydration and heart failure. If your BUN is more than 20 mg/dL, your kidneys may not be working at full strength. The eGFR is based on the CKD-EPI 2021 equation. Normal blood contains 7-20 mg/dl of urea. Methodology: Photometric Assay, Calculation Transport: Store serum at 2☌ to 8☌ after collection and ship the same day per packaging instructions included with the provided shipping box.Ĭauses for Rejection: Specimens other than serum improper labeling samples not stored properly samples older than stability limits ![]() Gently invert tube 5 times immediately after draw. Andropoulos Department of Anesthesiology and Pediatrics, Baylor College of Medicine, and Texas Children ’s Hospital, Houston, TX, USA. ![]() Collect and label sample according to standard protocols.Includes: Blood Urea Nitrogen (BUN), Serum Creatinine, BUN/Creatinine Ratio, Estimated Glomerular Filtration Rate (eGFR)Ĭontainer: Gel-barrier tube (SST, Tiger Top) ![]()
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