Urea Nitrogen, Blood
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To assist in assessing for kidney function toward diagnosing disorders such as kidney disease and dehydration. Also used in monitoring the effectiveness of therapeutic interventions such as hemodialysis.
Serum collected in a gold-, red-, or red/gray-top tube. Plasma collected in a green-top (heparin) tube is also acceptable.
|Age||Conventional Units||SI Units (Conventional Units × 0.357)|
|Newborn–3 yr||5–17 mg/dL||1.8–6.1 mmol/L|
|4–13 yr||7–17 mg/dL||2.5–6.1 mmol/L|
|14 yr–adult||8–21 mg/dL||2.9–7.5 mmol/L|
|Adult older than 90 yr||10–31 mg/dL||3.6–11.1 mmol/L|