Obstetrics & Gynecology

At St. Joseph Heritage Medical Group, we offer exceptional care for every stage of a woman’s life. If you're looking for prenatal care, our board-certified OB/GYNs specialize in helping ensure a healthy baby, while creating a warm and supportive environment for mom and dad. We also offer gynecology services for every age - whether that means prevention and wellness in your 20s, successfully navigating menopause in your 50s, or thriving in your 80s.

Our Obstetrics physicians are able to provide a vast array of services including:

  • Management of abnormal uterine bleeding
  • Pap smears and abnormal pap smear care
  • Comprehensive breast care
  • STD screenings
  • Hormone balancing including prescription of Bioidentical Hormone Therapy
  • Obstetric and prenatal care
  • Infertility
  • Vaginal bleeding
  • Minimally invasive surgery featuring da Vinci® robotics
    • Medical technology has come a long way in reducing the size of surgical incisions, pain, and recovery time needed for female procedures. We know that providing patients with the most advanced surgical procedures will get them back on their feet more quickly, and our use of the da Vinci® robot system for surgical procedures will do just that. We know that surgery doesn't have to be the first option and we strive to work with our patients to try other techniques for the problem if we can. In most cases when surgery really is the best choice, we want our patients to feel comfortable in our hands.
    • Some minimally invasive procedures we offer include:
      • Hysterectomy
      • Laparoscopic Surgery
      • Endometrial Ablation
      • Incontinence

Our Gynecology physicians are able to provide a wide selection of services including:

  • Well-woman exams (your annual exam)
  • Clinical breast exams and mammography
  • Abnormal pap smear diagnosis and treatment
  • Pelvic organ (bladder, uterus, etc.) prolapse treatment and repair
  • Customized hormone management
  • Abnormal uterine bleeding treatment
  • Sex hormone disorders
  • Menopause evaluation and treatment
  • Individualized care just for you!

We're happy to partner with Orange County's finest hospital.

  • St. Joseph Hospital offers growing families several benefits including:
    • Certified magnet status nursing care
    • 24-hour-a-day labor and delivery physician on-site for quick response or emergency care
    • Newly renovated, expanded family facility with many comforts of home
    • Children's hospital located right next door
  • To learn more about the St. Joseph Hospital Obstetrics program and award-winning Mother/Baby Assessment Center, click here.
  • Baby-Friendly Hospital - If you're delivering at St. Joseph Hospital, you'll be pleased to know that the hospital received a "Baby Friendly" designation. This means the staff is dedicated to providing mothers with the information, confidence and skills needed to successfully initiate and continue breastfeeding their infants. For more information, click here.

Sweet Beginnings Diabetes and Pregnancy Program

Our Obstetrics physicians offer management of multiple gestation pregnancies (for twins and triplets only) in addition to care for hypertension and diabetes during pregnancy. We are pleased to offer a Sweet Beginning Diabetes and Pregnancy Program to help expectant mothers during and after pregnancy.

This program is for pregnant women with diabetes, and those with gestational diabetes, who will be delivering at St. Joseph Hospital and are interested in learning about managing diabetes during and after pregnancy. Sessions are designed for mothers-to-be and their partners to learn how to monitor blood sugar and develop plans to balance food and activity levels. One-on-one counseling is available for those with special needs or concerns. No referral is necessary to attend. Please call (714) 628-3242 for more information.

Choosing a Pediatrician

If you're expecting, one of the most important decisions you can make prior to delivery is choosing a pediatrician for your baby. We're proud to offer some of the county's best pediatricians. Our doctors spend time getting to know you and your baby. After all, we value our partnership with you in delivering the best care possible for your child.

We also enjoy watching your child grow, that's why we offer many services especially designed for children. Click here to learn more.

Our Providers

Our Provider

Cristina Hernandez O'Day, MD
Obstetrics/Gynecology
City:  Orange
4.6 out of 5

Meet Our Program Director

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Our Locations

  • Orange - N. Tustin Ave 3111 N. Tustin Ave., Suite 250
    Orange, CA 92866
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  • Orange - 805 W. La Veta 805 W. La Veta Ave., Suite 101
    Orange, CA 92869
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  • Orange - 845 W. La Veta 845 W. La Veta Ave., Suite 108
    Orange, CA 92868
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  • Orange - Obstetrics/Gynecology - La Veta Ave. Suite 560 1140 W. La Veta Ave., Suite 560
    Orange, CA 92868
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  • Diamond Bar 1514 S. Valley Vista Dr.,
    Diamond Bar, CA 91765
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  • Fullerton - Women's Health Center 101 Laguna Road, Suite 100
    Fullerton, CA 92835
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  • Yorba Linda 4300 Rose Dr.,
    Yorba Linda, CA 92886
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Orange - N. Tustin Ave

Orange - N. Tustin Ave

Address
3111 N. Tustin Ave., Suite 250
Orange, CA 92866
Hours

Mon - Fri: 9 a.m. - 5 p.m.

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Orange - 805 W. La Veta

Orange - 805 W. La Veta

Address
805 W. La Veta Ave., Suite 101
Orange, CA 92869
Hours

Mon - Fri: 8:30 a.m. - 5 p.m.

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Orange - 845 W. La Veta

Orange - 845 W. La Veta

Address
845 W. La Veta Ave., Suite 108
Orange, CA 92868
Hours

Mon - Fri: 9 a.m. - 5 p.m.

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Orange - Obstetrics/Gynecology - La Veta Ave. Suite 560

Orange - Obstetrics/Gynecology - La Veta Ave. Suite 560

Address
1140 W. La Veta Ave., Suite 560
Orange, CA 92868
Hours

Mon - Fri: 8 a.m. - 5 p.m.

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Diamond Bar

Diamond Bar

Address
1514 S. Valley Vista Dr.,
Diamond Bar, CA 91765
Hours

Mon - Thur: 7:30 a.m. - 6 p.m.
Fri: 7:30 a.m. - 5:30 p.m.
Lab: Mon - Fri: 7:30 a.m. - 4:45 p.m.

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Fullerton - Women's Health Center

Fullerton - Women's Health Center

Address
101 Laguna Road, Suite 100
Fullerton, CA 92835
Hours

Mon - Fri: 8 a.m. - 5 p.m.

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Yorba Linda

Yorba Linda

Address
4300 Rose Dr.,
Yorba Linda, CA 92886
Hours

Monday - Friday
Office: 8 a.m. - 5 p.m.
Lab: 6:30 a.m. - 5 p.m.

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