PMID- 30040921 OWN - NLM STAT- MEDLINE DCOM- 20190212 LR - 20190215 IS - 1873-3492 (Electronic) IS - 0009-8981 (Linking) VI - 486 DP - 2018 Nov TI - Elevated creatinine in a patient on IVIG-therapy. PG - 94-97 LID - S0009-8981(18)30385-1 [pii] LID - 10.1016/j.cca.2018.07.038 [doi] AB - BACKGROUND: Intravenous immunoglobulin (IVIG) is prepared from the plasma of hundreds of blood donors and is used in the treatment of immunodeficiencies, autoimmune conditions, infections and inflammatory conditions. IVIG formulations contain one of a number of small molecule stabilizers, including sugars, polyols, and amino acids, some of which can cause acute renal failure. CASE REPORT: A 61 y-old woman was treated for paraneoplastic syndrome due to small cell lung cancer in which a creatinine measurement unexpectedly increased during IVIG therapy. This increased creatinine measurement was due to the proline stabilizer in the IVIG fluid that had inadvertently diluted the blood sample. Investigation revealed that proline causes a positive interference in enzymatic creatinine assays, likely due to the activity of sarcosine oxidase, a key component of the assay, on proline. CONCLUSIONS: Increased proline concentrations can occur after administration of high-dose proline (as was the case here) or in the rare metabolic disorders hyperprolinema types I and II. CI - Copyright (c) 2018 Elsevier B.V. All rights reserved. FAU - Knezevic, Claire E AU - Knezevic CE AD - Department of Pathology, Johns Hopkins University School of Medicine, 1800 Orleans Street, Baltimore, MD 21287, USA. FAU - Ness, Mary Ann AU - Ness MA AD - Department of Pathology, Johns Hopkins University School of Medicine, 1800 Orleans Street, Baltimore, MD 21287, USA. FAU - Kratz, Lisa E AU - Kratz LE AD - Department of Neurogenetics, Kennedy Krieger Institute, 707 N Broadway, Baltimore, MD 21205, USA. FAU - Marzinke, Mark A AU - Marzinke MA AD - Department of Pathology, Johns Hopkins University School of Medicine, 1800 Orleans Street, Baltimore, MD 21287, USA. Electronic address: mmarzin1@jhmi.edu. LA - eng PT - Case Reports PT - Journal Article DEP - 20180721 PL - Netherlands TA - Clin Chim Acta JT - Clinica chimica acta; international journal of clinical chemistry JID - 1302422 RN - 0 (Immunoglobulins, Intravenous) RN - 9DLQ4CIU6V (Proline) RN - AYI8EX34EU (Creatinine) SB - IM MH - Carcinoma, Non-Small-Cell Lung/blood/*therapy MH - Creatinine/*blood MH - Female MH - Humans MH - *Immunoglobulins, Intravenous MH - Lung Neoplasms/blood/*therapy MH - Middle Aged MH - Paraneoplastic Syndromes/blood/*therapy MH - Proline/blood OTO - NOTNLM OT - Creatinine OT - Hyperprolinemia OT - Interference OT - Intravenous immunoglobulin EDAT- 2018/07/25 06:00 MHDA- 2019/02/13 06:00 CRDT- 2018/07/25 06:00 PHST- 2018/07/06 00:00 [received] PHST- 2018/07/20 00:00 [revised] PHST- 2018/07/20 00:00 [accepted] PHST- 2018/07/25 06:00 [pubmed] PHST- 2019/02/13 06:00 [medline] PHST- 2018/07/25 06:00 [entrez] AID - S0009-8981(18)30385-1 [pii] AID - 10.1016/j.cca.2018.07.038 [doi] PST - ppublish SO - Clin Chim Acta. 2018 Nov;486:94-97. doi: 10.1016/j.cca.2018.07.038. Epub 2018 Jul 21.