I recently asked if the dwell time of dianeal matters in diagnosing peritonitis. The answer was (paraphrased) as long as it's in for 2 hours or longer. The second part of the questions is, does the amount of dianeal matter. If a patient comes in for peritonitis testing, and the center drains 300 cc's of fluid; can that amount of fluid be tested, and would the results be correct? Is there any type of dilution or concentration that may throw labs off?

Questions About PD

Anthony Mc Connell, Nurse from Mayo Clinic Rochester MN asked
I recently asked if the dwell time of dianeal matters in diagnosing peritonitis. The answer was (paraphrased) as long as it's in for 2 hours or longer. The second part of the questions is, does the amount of dianeal matter. If a patient comes in for peritonitis testing, and the center drains 300 cc's of fluid; can that amount of fluid be tested, and would the results be correct? Is there any type of dilution or concentration that may throw labs off?

1 answer

The amount drained will not be a major issue. Innoculation of blood culture bottles can help reduce the culture negative rate. Sometimes, centrifugation of a PD bag can improve the microbiological yield so ideally if an entire PD bag can be sent off that would be better, especially if you are noticing a high culture negative rate. 

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