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Fisiologi terjadinya kala III persalinan adalah setelah lahir otot uterus berkontraksi mengikuti penyusutan volume rongga uterus setelah lahirnya bayi, hal ini menyebabkan berkurangnya ukuran tempat perlekatan plasenta yang dapat dipengaruhi oleh kontraksi uterus dan kadar Hb ibu. Penelitian ini bertujuan untuk melihat hubungan kontraksi uterus dan kadar hemoglobin ibu dengan lamanya kala III di Bidan Praktek Mandiri KY Kabupaten Pesisir Selatan tahun 2018. Jenis penelitian adalah analitik dengan desain cross sectional yang dilakukan di Bidan Praktek Mandiri KY Kabupaten Pesisir Selatan pada bulan Desember 2017-Februari 2018. Populasi seluruh ibu bersalin berjumlah 31 orang dengan teknik pengambilan sampel total sampling. Data dikumpulkan menggunakan lembar observasi dan dianalisis secara univariat dan bivariat dengan menggunakan uji statistik chi-square. Hasil penelitian didapatkan 54,8% responden dengan lamanya kala III tidak normal. Sebesar 48,4% responden bersalin dengan kontraksi uterus tidak normal dan 61,3% responden memiliki kadar Hb tidak normal. Ada hubungan kontraksi uterus (p value = 0,000 dan OR 60,7) dan kadar Hb ibu (p value = 0,000 dan OR 58,7) dengan lamanya kala III. Berpedoman pada hasil penelitian, maka dapat disimpulkan bahwa lamanya kala III persalinan dapat dipengaruhi oleh kontraksi uterus dan kadar Hb ibu, untuk itu diharapkan pada bidan melakukan pemeriksaan kadar Hb ibu hamil di tiap trimester agar dapat mendeteksi secara dini kejadian anemia, menganjurkan untuk konsumsi tablet Fe dan asupan makanan yang bergizi terutama yang mengandung zat besi sangat diperlukan, dan selalu mengunakan partograf untuk melihat kemajuan persalinan dan deteksi dini adanya komplikasi dalam persalinan termasuk adanya kelainan dalam kontraksi uterus.

The physiology of the third stage of labor is after birth the uterine muscle contracts following the depletion of the volume of the uterine cavity after the birth of the baby, thus reducing the size of the placental attachment site that can be affected by uterine contractions and maternal Hb levels. This study aims to see the relationship of uterine contractions and maternal hemoglobin level with the duration of stage III in the Midwife of Independent Practice "KYCenter Southern Coastal District 2018. The type of this research is analytic with cross sectional design conducted in Midwife Practice Mandiri "KY" Center Southern Coastal District on December 2017-February 2018. Population of all maternal mother is 31 people with sampling total sampling technique. Data were collected using observation sheet and univariate and bivariate analyzed by using chi-square statistic test. The results obtained 54.8% of respondents with the length of stage III is not normal. 48.4% of the respondents had abnormal uterine contractions and 61.3% of respondents had abnormal Hb levels. There was a relationship of uterine contraction (p value = 0.000 and OR 60,7) and mother's Hb level (p value = 0,000 and OR 58,7) with time duration III. Based on the results of the study, it can be concluded that the duration of the third stage of labor may be affected by uterine contractions and maternal Hb levels, therefore it is expected that the midwife checks the pregnant women's hemoglobin levels in each trimester in order to detect anemia early, and intake of nutritious foods, especially those containing iron is very necessary, and always use the partograf to see the progress of labor and early detection of complications in childbirth, including abnormalities in uterine contractions.