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A hemodialysis (hd) clinic biomedical technician (biomed) reported that some naturalyte had low conductivity and four cases were pulled from the shelf.Upon follow up, the customer said that the conductivity was at 13.2-13.3 and the machine alarmed low conductivity.The biomed stated the product was within range, so it was used for patient treatment without issues.There was no patient adverse event.A return goods authorization (rga) was issued to the clinic for product return.
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Plant investigation: a product history review was performed.A review of the complaint management system identified 19 additional complaints related to conductivity issues with the reported lot.A review of the product inventory records for lot no.Indicated that 2241 cases of finished product were manufactured for distribution with no noted nonconformances.After reviewing the finished product release summary, it was determined that 20lxac056 met release specifications.As of 11/12/2020 no samples were returned.Samples are not needed to confirm the allegation.A sample retain of the reported lot was tested and found to be within specifications.Through other complaint allegations of the same issue for lots 20lxac056, 20lxac058, and 20lxac076, there were companion samples available for testing which were tested at both the oregon and irving laboratories and results were found to be conflicting.Due to the conflicting results found between the laboratories, the oregon test methods were reviewed and a deficiency was found in the test method pertaining to the sodium and potassium analyte tests.Because of the deficiency found in the test method, it was determined that lot 20lxac056 did not meet release specifications and the allegation conductivity low was confirmed.In conclusion, 20lxac056 release testing was found to be compromised due to the deficient test method.A non-conformance was opened for allegations of conductivity issues and escalated to a corrective action preventative action (capa).Based on the investigation performed, cause was traced to manufacturing.
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