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Leukocyte esterase activity was measured by the dipstick test (Nephurtest) and an <jats:italic>in vitro<\/jats:italic> photometric method. Amniotic fluid samples were collected through an intrauterine transvaginal pressure catheter. The serial CRP and WBC levels from admission to the delivery and CRP levels from delivery to the first post partum day increased statistically significantly. Levels of both markers correlated significantly with duration of labor. Both amniotic white blood cells and leukocyte esterase activity increased during labor. Bacterial colonization of amniotic fluid was not clearly associated with amniotic LE\u2010activity or leukocyte count as determinated by Gram stain. The tests evaluated cannot be regarded as reliable methods in distinguishing intra\u2010amniotic infection during labor and vaginal delivery at term.<\/jats:p>","DOI":"10.3109\/00016349509009940","type":"journal-article","created":{"date-parts":[[2007,11,13]],"date-time":"2007-11-13T19:11:09Z","timestamp":1194981069000},"page":"33-39","update-policy":"http:\/\/dx.doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":12,"title":["Infection markers during labor at term"],"prefix":"10.1111","volume":"74","author":[{"given":"Leea","family":"Keski\u2010Nisula","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Sakarl","family":"Suonio","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Maija","family":"Makkonen","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Marja\u2010Leena","family":"Katila","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Eino","family":"Puhakainen","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Arja","family":"Kuronen","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"311","published-online":{"date-parts":[[2011,1,7]]},"reference":[{"key":"e_1_2_1_2_1","doi-asserted-by":"publisher","DOI":"10.1016\/0002-9378(91)90707-X"},{"key":"e_1_2_1_3_1","first-page":"316","article-title":"Amniocentesis for gram stain and culture in preterm premature rupture of the membranes","volume":"66","author":"Broekhuizen F. 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