Background: In East Lampung, the rate of K4 in Several Primary Health Cares has exceeded 90% of National targetsDonomulyo; while in Primary Health Care, the rate of K4 achieved only 71.2%, with an increase dropped out the rate from 18.19% in 2010 to 21.69% in 2011.

Aim: The study's objective was to determine K4 antenatal care is contributing factor in Donomulyo Primary Health Center in 2013.

Method: The study was analytical cross-sectional research. The study's population was all third-trimester pregnant women in Donomulyo Primary Health Care's working area during July 2013, 76. The sampling technique in this study was total sampling, in which there were 48 samples, including full inclusion and exclusion criteria of the study. The Data was analyzed using frequentation distribution, chi-square, and double logistics regression.

Result: 45% mother did not fully fill K4 antenatal visit, 33.3% of respondents were in risky age, the parity risky was 45.8%, 54.2% of respondents had low social status, 43.8% of respondents could not easily access health facilities, 41.7% of the respondents had low knowledge and 45.8% of the respondents thought that health worker's attitude was negative. The research found a significant correlation among maternal age (p value = 0.010 and OR = 6,600), parity (p value = 0.047 and OR = 3.938), economic status (p value = 0.001, OR = 10.125), access to health facilities (p value = 0.024, OR = 4.750), knowledge (p value = 0.011 and OR = 5,833), and health worker's attitude (p value = 0.047 and OR 3.938).

Conclusion and Suggestion: Health providers must increase patient's knowledge by giving comprehensive counseling about the benefits of K4 antenatal visits and improving the quality of care to attract women to do antenatal visits, especially for high-risk women.

Keywords: pregnancy, antenatal visits, K4