Maternal-Fetal Medicine


Rady Children's Specialists/San Diego Perinatal Center

Medical Group / IPA


Medical School

Drexel University College of Medicine


Tufts University School of Medicine


Stanford University

Board Certifications

Maternal-Fetal Medicine, Obstetrics and Gynecology




Dr. Kristin Marie Williams, FACOG, is a maternal-fetal medicine specialist at the San Diego Perinatal Center, the Maternal-Fetal Medicine Division of Rady Children's Specialists of San Diego.

Born in the Midwest and raised in Texas, she earned her medical degree at MCP-Hahnemann University, completed her internship in obstetrics and gynecology at Tufts University, completed her residency in ob/gyn at Stanford University and completed her fellowship in maternal-fetal medicine at Stanford.

Her clinical expertise and interests are prenatal diagnosis and procedures (nuchal translucency, nasal bone, first trimester early anatomy scan, detailed anatomy scan, fetal echocardiogram; amniocentesis, fetal reduction and percutaneous umbilical cord sampling/transfusion) and perinatal consultation and co-management (multiple gestations, prior preterm delivery, cervical insufficiency with both prophylactic and rescue cerclage, advanced maternal age, IVF pregnancies, recurrent pregnancy loss, thrombophilias, intrauterine).

Her professional affiliations include the Society of Maternal Fetal Medicine, American College of Obstetrics and Gynecology, American Institute of Ultrasound in Medicine and Nuchal Translucency Quality Review.

Dr. Williams and her husband (who is British) have a young daughter, Faith, who is here because of the wonderful doctors, ultrasonographers and nurses who cared for her during a very complicated pregnancy. They are delighted to have the opportunity to live and work in beautiful San Diego.

Dr. Williams is looking forward to getting to know the local medical community and taking excellent care of high-risk obstetrical patients.


Ultrasound estimation of fetal weight in small for gestational age pregnancies.
Blumenfeld YJ, Lee HC, Pullen KM, Wong AE, Pettit K, Taslimi MM

Oral misoprostol and vaginal isosorbide mononitrate for labor induction: a randomized controlled trial.
Collingham JP, Fuh KC, Caughey AB, Pullen KM, Lyell DJ, El-Sayed YY

Daily compared with 8-hour gentamicin for the treatment of intrapartum chorioamnionitis: a randomized controlled trial.
Lyell DJ, Pullen K, Fuh K, Zamah AM, Caughey AB, Benitz W, El-Sayed YY

Maintenance nifedipine tocolysis compared with placebo: a randomized controlled trial.
Lyell DJ, Pullen KM, Mannan J, Chitkara U, Druzin ML, Caughey AB, El-Sayed YY

Bacterial flora-typing with targeted, chip-based Pyrosequencing.
Sundquist A, Bigdeli S, Jalili R, Druzin ML, Waller S, Pullen KM, El-Sayed YY, Taslimi MM, Batzoglou S, Ronaghi M

Randomized comparison of intravenous terbutaline vs nitroglycerin for acute intrapartum fetal resuscitation.
Pullen KM, Riley ET, Waller SA, Taylor L, Caughey AB, Druzin ML, El-Sayed YY

Magnesium sulfate compared with nifedipine for acute tocolysis of preterm labor: a randomized controlled trial.
Lyell DJ, Pullen K, Campbell L, Ching S, Druzin ML, Chitkara U, Burrs D, Caughey AB, El-Sayed YY

Perinatal outcomes after successful and failed trials of labor after cesarean delivery.
El-Sayed YY, Watkins MM, Fix M, Druzin ML, Pullen KM, Caughey AB

Randomized comparison of intravenous nitroglycerin and subcutaneous terbutaline for external cephalic version under tocolysis.
El-Sayed YY, Pullen K, Riley ET, Lyell D, Druzin ML, Cohen SE, Chitkara U

See the full listing of this physician's publications on PubMed, a service of the National Library of Medicine.

PubMed is a third-party website and not affiliated with Rady Children's Hospital-San Diego.

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