There is no specific blood test to monitor vancomycin levels in the blood, but a vancomycin trough level is often measured to ensure that the drug concentration is within the therapeutic range.

Vancomycin is a potent antibiotic used to treat serious bacterial infections such as sepsis and pneumonia. It works by inhibiting the growth of bacteria by binding to their cell walls. However, vancomycin can also be toxic to the kidneys and hearing if the concentration in the blood is too high. Therefore, it is important to monitor vancomycin levels in the blood to ensure that the drug is effective and safe.

The vancomycin trough level is a blood test that measures the concentration of vancomycin in the blood just before the next dose is due. The target trough level varies depending on the type of infection being treated, but typically ranges from 10 to 20 mcg/mL. If the trough level is too low, the drug may not be effective against the infection, while if it is too high, it may cause toxicity.

In addition to measuring the vancomycin trough level, other tests may be ordered to monitor kidney function, such as a serum creatinine level, since vancomycin is cleared from the body through the kidneys. If the kidney function is impaired, the dosage of vancomycin may need to be adjusted to avoid toxicity.

Overall, monitoring vancomycin levels in the blood is an important part of ensuring the safety and effectiveness of this antibiotic in the treatment of serious bacterial infections.