Which of the following tests is used to assess kidney function in SLE?

Serum creatinine is a key indicator used to assess kidney function, particularly in conditions like systemic lupus erythematosus (SLE), where kidney involvement can occur. Elevated levels of serum creatinine often indicate impaired renal function, signaling potential kidney damage or disease. Since SLE can lead to lupus nephritis, a complication resulting in increased inflammation and damage to the kidneys, monitoring serum creatinine levels allows healthcare providers to gauge the severity of kidney impairment and manage treatment effectively.

Other tests, such as a complete blood count, might provide information about overall health and blood components but do not specifically assess kidney function. The antinuclear antibody test is utilized to help diagnose autoimmune conditions like SLE but is not a direct measure of kidney health. A urine culture may be helpful in detecting urinary tract infections but does not provide direct insight into kidney function. Therefore, serum creatinine is the most relevant test in this context for assessing kidney function in patients with SLE.