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Dr. Nikolaos Zacharias

Maternal-Fetal Medicine
Houston, TX
27 years experience male

Locations

Office

Houston, TX

Address

5656 Kelley Street, Houston, TX, US
Directions

My office hours

Tuesday: 8:00am - 5:00pm
Show more

Fax

(713) 566-4418

Insurances accepted

Blue Cross Blue Shield of Texas

UnitedHealthcare

Medicare

Medicaid

Aetna

About

Bio

Nikolaos Zacharias, MD, FACOG, is a native of Greece; he earned his medical diploma with excellence from the National Kapodistrian University of Athens, Greece (1995) reciting the Hippocratic Oath as a top graduate in his class. Dr. Zacharias received numerous Hellenic scholarships for undergraduate and postgraduate education (1989-2002). He trained in Obstetrics Gynecology at Baylor College of Medicine, (1998-2002), elected chief resident in 2001. He received the Council of Resident Education in Obstetrics Gynecology Outstanding Academic Achievement Award four consecutive years (1999-2002) for scoring at the top 3% of his U.S. peers at these annual examinations. His passion for prenatal sonography and profound interest in pregnancy complications led him to a fellowship in Maternal-Fetal Medicine at the University of Texas Medical Branch, in Galveston, Texas (2002-2005), where he received the UTMB Hospital Academic Fellowship Award (2002-2005) and enrolled in a Masters in Medical Science post-graduate program on clinical research design (2003-2005, all courses passed with excellence, thesis defense pending). Dr. Zacharias returned to Baylor as assistant professor of Obstetrics Gynecology, in the Maternal Fetal Medicine Division (2005 - 2013). He served as medical director of the Harris Health System Prenatal Ultrasound Screening Program (2005 - 2012) and as founding medical director of the Ben Taub Maternal Fetal Medicine Prenatal Ultrasound Unit (2008 - 2012), having supervised over 30,000 prenatal sonograms. Dr. Zacharias has been an active member of the Texas Children’s Fetal Center (2006-2013), teaching faculty at Ben Taub General (2005 - 2013) and Texas Children’s Hospital (2008 - 2013). He is board-certified in Obstetrics Gynecology (2008) and Maternal Fetal Medicine (2011). Dr. Zacharias received Baylor's medical student faculty teaching award (2011) and was elected to America's Top Obstetricians Gynecologists (2012). He co-directed the maternal-fetal medicine elective clerkship at Baylor College of Medicine with Dr. Robert Carpenter (2012-2013). Dr. Zacharias is a fellow of the American College of Obstetricians Gynecologists (2010) and a regular member of the Society for Maternal-Fetal Medicine (2012). On August 2013 Dr. Zacharias became the inaugural Medical Director of Prenatal Ultrasound and Maternal-Fetal Medicine at the Center for Medical Genetics - collaborating with Geneticist Dr. Katherine Thompson. His focus will be on consultative perinatology and prenatal sonography with genetic testing, serving his beloved Southeast Texas population. Languages spoken: English, Spanish, French and Greek.

Specialties
Doctors may have more than one area of specialty interest. Board certification in a specialty area means the doctor has completed formal training and has practice experience in that specialty, and has passed the certification examination from the corresponding accredited medical specialty board.

Maternal-Fetal Medicine

Obstetric Medicine

Obstetrics and Gynecology

Languages spoken

Greek

Doctor Q&A

2.0K Answers
718 Agrees
The number of answers this doctor has agreed with.
A 43-year-old member asked:
Dr. Nikolaos Zacharias
Maternal-Fetal Medicine 27 years experience
Painless early deliv: Painless midtrimester delivery is a typical definition of incompetent cervix. More modern definitions rely increasingly on sonographic features before... Read More
Created for people with ongoing healthcare needs but benefits everyone.
A 43-year-old member asked:
Dr. Nikolaos Zacharias
Maternal-Fetal Medicine 27 years experience
Sure.: The evidence about c-section by maternal request (not "demand") suggests it is a reasonable option for most us women looking to have 1-2 children. You... Read More
Created for people with ongoing healthcare needs but benefits everyone.
A 37-year-old member asked:
Dr. Nikolaos Zacharias
Maternal-Fetal Medicine 27 years experience
YES!: Placenta previa at term left untreated shall cause severe maternal hemorrhage - even possible exsanguination and maternal death. The proper management... Read More
Created for people with ongoing healthcare needs but benefits everyone.
A 29-year-old member asked:
Dr. Nikolaos Zacharias
Maternal-Fetal Medicine 27 years experience
Not necessarily.: As with anything else in nature, there is a physiologic variation regarding the doubling time for beta HCG in the first trimester. The rule of thumb i... Read More
Created for people with ongoing healthcare needs but benefits everyone.
A 43-year-old member asked:
Dr. Nikolaos Zacharias
Maternal-Fetal Medicine 27 years experience
Possible/advisable??: External cephalic version involves manual pressure/force on the term gravid uterus and fetus under anesthesia and muscle relaxation. You can appreciat... Read More
Created for people with ongoing healthcare needs but benefits everyone.
A 33-year-old member asked:
Dr. Nikolaos Zacharias
Maternal-Fetal Medicine 27 years experience
Yes.: Any delivery before 37 weeks is considered preterm and has significant short and long term consequences. A 33 week delivery is not desirable, but is m... Read More
Created for people with ongoing healthcare needs but benefits everyone.
A 47-year-old member asked:
Dr. Nikolaos Zacharias
Maternal-Fetal Medicine 27 years experience
Prenatal ultrasound.: The best way to asses fetal growth is customized fetal growth curves per prof. Jason gardosi's data: www.Gestation.Net.
Created for people with ongoing healthcare needs but benefits everyone.
A 39-year-old member asked:
Dr. Nikolaos Zacharias
Maternal-Fetal Medicine 27 years experience
Many reasons.: The placental examination is essential to assure complete delivery, assess anomalies of cord insertion, exclude paraplacenta, determine chorionicity i... Read More
Created for people with ongoing healthcare needs but benefits everyone.
A 36-year-old member asked:
Dr. Nikolaos Zacharias
Maternal-Fetal Medicine 27 years experience
No more than usual.: The institute of medicine of the national academy of sciences recommends intake of 1300 mg of calcium daily for girls ages 14 to 18 and 1000 mg per da... Read More
Created for people with ongoing healthcare needs but benefits everyone.
A 29-year-old member asked:
Dr. Nikolaos Zacharias
Maternal-Fetal Medicine 27 years experience
Folic acid deficient: Folic acid deficieny can cause fetal heart defects! multiple genetic, drug, medical and environmental factors can predispose to fetal heart defects.
Created for people with ongoing healthcare needs but benefits everyone.
A 21-year-old member asked:
Dr. Nikolaos Zacharias
Maternal-Fetal Medicine 27 years experience
Yes.: One can contract toxoplasmosis by consuming food or water contaminated with cat feces or by contaminated environmental samples (such as fecal-contamin... Read More
Created for people with ongoing healthcare needs but benefits everyone.
A 32-year-old member asked:
Dr. Nikolaos Zacharias
Maternal-Fetal Medicine 27 years experience
Painful contractions: Regular and painful contractions before 37 weeks of pregnancy that result in cervical changes.
Created for people with ongoing healthcare needs but benefits everyone.
A 27-year-old member asked:
Dr. Nikolaos Zacharias
Maternal-Fetal Medicine 27 years experience
Daily in reproductiv: Daily use is encouraged during reproductive years; the Folic Acid is most beneficial, as it can prevent preterm birth, open neural tube defects and ca... Read More
Created for people with ongoing healthcare needs but benefits everyone.
A 36-year-old member asked:
Dr. Nikolaos Zacharias
Maternal-Fetal Medicine 27 years experience
Look out for:: Vaginal bleeding, leaking fluid, fever >100 f, increasing lower abdominal cramps/pain, rash, contractions. You should be fine if feeling better by ... Read More
Created for people with ongoing healthcare needs but benefits everyone.
A 37-year-old member asked:
Dr. Nikolaos Zacharias
Maternal-Fetal Medicine 27 years experience
No.: If anything, fetuses are more likely to tolerate substances that their mother received during pregnancy - not become allergic to them. Antibiotics in ... Read More
Created for people with ongoing healthcare needs but benefits everyone.
A 21-year-old member asked:
Dr. Nikolaos Zacharias
Maternal-Fetal Medicine 27 years experience
Perhaps.: Down syndrome can now be detect by blood test by 12 weeks. Most fetal anatomical problems do not manifest untl 16-20 weeks, although some major defect... Read More
Created for people with ongoing healthcare needs but benefits everyone.
A 22-year-old member asked:
Dr. Nikolaos Zacharias
Maternal-Fetal Medicine 27 years experience
Potentially.: If it causes pyelonephritis, cystitis or even asymptomatic bacteriuria, e. Coli can lead to preterm birth with all its complications. If it causes sev... Read More
Created for people with ongoing healthcare needs but benefits everyone.
A 21-year-old member asked:
Dr. Nikolaos Zacharias
Maternal-Fetal Medicine 27 years experience
If severe infection.: Any severe infection during pregnancy can cause fetal loss. Salmonella is certainly able to do that if high fever, profuse diarrhea and dehydration en... Read More
Created for people with ongoing healthcare needs but benefits everyone.
A 21-year-old member asked:
Dr. Nikolaos Zacharias
Maternal-Fetal Medicine 27 years experience
Yes via pyrexia!: Any febrile illness during the first trimester can cause open neural tube defects. Dehydration from profound diarrhea can lead to miscarriage and pret... Read More
Created for people with ongoing healthcare needs but benefits everyone.
A 19-year-old female asked:
Dr. Nikolaos Zacharias
Maternal-Fetal Medicine 27 years experience
Yes - go to the ER.: If your contractions are painful [especially if they are coming every 5-10 minutes] please see a physician ASAP - you may be going into labor or exper... Read More
Created for people with ongoing healthcare needs but benefits everyone.
A 24-year-old female asked:
Dr. Nikolaos Zacharias
Maternal-Fetal Medicine 27 years experience
Relax: Your results are within normal range - relax. Make sure you drink plenty of fluids daily (water is best), take folic acid ~1 mg orally daily and accep... Read More
Created for people with ongoing healthcare needs but benefits everyone.
A 35-year-old female asked:
Dr. Nikolaos Zacharias
Maternal-Fetal Medicine 27 years experience
Hormones likely: The estrogen and progesterone surge in the second trimester commonly triggers headaches in pregnancy in predisposed women. Try Reglan + Tylenol (aceta... Read More
Created for people with ongoing healthcare needs but benefits everyone.
A 17-year-old female asked:
Dr. Nikolaos Zacharias
Maternal-Fetal Medicine 27 years experience
Seek REI help.: A reputable reproductive endocrinology and infertility specialist and laboratory in your area is your best bet for a safe pregnancy. You might need ch... Read More
Created for people with ongoing healthcare needs but benefits everyone.
A 39-year-old female asked:
Dr. Nikolaos Zacharias
Maternal-Fetal Medicine 27 years experience
No - go to ER!: This is not normal and merits medical attention as soon as possible. Call ambulance to go to er now!
Created for people with ongoing healthcare needs but benefits everyone.
A 34-year-old female asked:
Dr. Nikolaos Zacharias
Maternal-Fetal Medicine 27 years experience
Safe.: Clarithromycin is a safe antibiotic during pregnancy, with medical supervision. Take Folic Acid 1-5 mg daily and best of luck!
Created for people with ongoing healthcare needs but benefits everyone.
A 21-year-old female asked:
Dr. Nikolaos Zacharias
Maternal-Fetal Medicine 27 years experience
No.: If your dates are correct, there is no indication for tocolysis after 34 weeks.
Created for people with ongoing healthcare needs but benefits everyone.
A 23-year-old female asked:
Dr. Nikolaos Zacharias
Maternal-Fetal Medicine 27 years experience
Yes.: Round ligament pain is a normal pregnancy symptom/discomfort that should gradually improve and generally respond to tylenol (acetaminophen) and rest/a... Read More
Created for people with ongoing healthcare needs but benefits everyone.
A 20-year-old female asked:
Dr. Nikolaos Zacharias
Maternal-Fetal Medicine 27 years experience
Wait for a month.: I would advise against resumption of sexual activity until your next cycle. Talk to your gynecologist about contraceptive options!
Created for people with ongoing healthcare needs but benefits everyone.
A 16-year-old female asked:
Dr. Nikolaos Zacharias
Maternal-Fetal Medicine 27 years experience
Yes.: Any contact between spermatozoa and oocyte can result in conception - whether direct or indirect, natural or artificial. Your scenario could introduce... Read More
Created for people with ongoing healthcare needs but benefits everyone.
A 40-year-old female asked:
Dr. Nikolaos Zacharias
Maternal-Fetal Medicine 27 years experience
Yes!: The main thing to do at 8 weeks is to take 1-5 mg of Folic Acid daily. Sleeping position is not important - it is fine to sleep on your tummy if you p... Read More
Created for people with ongoing healthcare needs but benefits everyone.
A 24-year-old female asked:
Dr. Nikolaos Zacharias
Maternal-Fetal Medicine 27 years experience
21 mm: The CRL corresponding to 8w5d is 21 mm.
Created for people with ongoing healthcare needs but benefits everyone.
A 23-year-old female asked:
Dr. Nikolaos Zacharias
Maternal-Fetal Medicine 27 years experience
Rare, but possible.: PPROM is rare before 20 weeks, but not unheard of; please see your obstetrician ASAP if you think that you are leaking amniotic fluid vaginally, as th... Read More
Created for people with ongoing healthcare needs but benefits everyone.
A 20-year-old female asked:
Dr. Nikolaos Zacharias
Maternal-Fetal Medicine 27 years experience
Long time in hair.: Marijuana crosses the placenta and has untold effects on the developing brain of the fetus. Nobody has studies these effects in detail, but they may n... Read More
Created for people with ongoing healthcare needs but benefits everyone.
A 23-year-old female asked:
Dr. Nikolaos Zacharias
Maternal-Fetal Medicine 27 years experience
3-5 days.: Conception occurs within 24 hours of ovulation typically and implantation 3-5 days later in most cases. As a result, the most sensitive HCG assays wil... Read More
Created for people with ongoing healthcare needs but benefits everyone.
A 30-year-old female asked:
Dr. Nikolaos Zacharias
Maternal-Fetal Medicine 27 years experience
Colace (docusate sodium) and sitz bath: Try a stool softener such as solace that is not absorbed nor stimulating. Sitz baths and baby wipes will also help. Prefer foods rich in fiber and avo... Read More
Created for people with ongoing healthcare needs but benefits everyone.
A 23-year-old female asked:
Dr. Nikolaos Zacharias
Maternal-Fetal Medicine 27 years experience
Sure.: See your gynecologist for related questions. Misoprostol can certainly cause abortion and must only be taken with medical supervision.
Created for people with ongoing healthcare needs but benefits everyone.
A 18-year-old female asked:
Dr. Nikolaos Zacharias
Maternal-Fetal Medicine 27 years experience
No - see your ob!: You could be experiencing urinary tract infection, urolithiasis (sludge, sand), genital infection or just increased vaginal discharge of pregnancy (li... Read More
Created for people with ongoing healthcare needs but benefits everyone.
A 22-year-old female asked:
Dr. Nikolaos Zacharias
Maternal-Fetal Medicine 27 years experience
Potentially.: Conception can occur from vaginal intercourse during menses if ovulation occurs early.
Created for people with ongoing healthcare needs but benefits everyone.
A 36-year-old male asked:
Dr. Nikolaos Zacharias
Maternal-Fetal Medicine 27 years experience
Phenergan (promethazine): Phenergan (promethazine) Reglan and Tums may safely help with nausea!
Created for people with ongoing healthcare needs but benefits everyone.
A 27-year-old female asked:
Dr. Nikolaos Zacharias
Maternal-Fetal Medicine 27 years experience
Tamilfu/Zpack/Tyleno: Take tamiflu 75 mg PO bid x5 days, consider z-pack 500 mg PO the first day and 250 mg PO for another 4 days, take tylenol (acetaminophen) to keep your... Read More
Created for people with ongoing healthcare needs but benefits everyone.
A 36-year-old male asked:
Dr. Nikolaos Zacharias
Maternal-Fetal Medicine 27 years experience
Eat: Eat small and frequent meals/snacks.
Created for people with ongoing healthcare needs but benefits everyone.
A 36-year-old male asked:
Dr. Nikolaos Zacharias
Maternal-Fetal Medicine 27 years experience
Tylenol (acetaminophen): Tylenol (acetaminophen) 1000 mg + Reglan 10 mg is as effective as much more expensive tryptans and extremely safe!
Created for people with ongoing healthcare needs but benefits everyone.
A 33-year-old female asked:
Dr. Nikolaos Zacharias
Maternal-Fetal Medicine 27 years experience
Fibroids/endometrios: Several reasons for dyspareunia: uterine fibroids, pelvic endometriosis, pelvic adhesive disease, anatomical variants such as retroverted/retroflexed ... Read More
Created for people with ongoing healthcare needs but benefits everyone.
A 39-year-old female asked:
Dr. Nikolaos Zacharias
Maternal-Fetal Medicine 27 years experience
MFM care.: Depending on your gestational age maternal-fetal medicine consultation will help you and the babies achieve the optimal perinatal outcome. Pessary app... Read More
Created for people with ongoing healthcare needs but benefits everyone.
A 31-year-old member asked:
Dr. Nikolaos Zacharias
Maternal-Fetal Medicine 27 years experience
Fear, no - concern.: Being appropriately concerned for one of the most dangerous periods in your (and your baby's) life is reasonable. Fear should not creep in, especially... Read More
Created for people with ongoing healthcare needs but benefits everyone.
A 20-year-old male asked:
Dr. Nikolaos Zacharias
Maternal-Fetal Medicine 27 years experience
Robitussin (guaifenesin).: Robitussin (guaifenesin) is safe to use during pregnancy as directed. Avoid dm/cold types and ask your obstetrician.
Created for people with ongoing healthcare needs but benefits everyone.
A 30-year-old female asked:
Dr. Nikolaos Zacharias
Maternal-Fetal Medicine 27 years experience
Spinal/epidural.: The regional anesthetic method used for a cesarean section can cause low back pain. Additionally, the procedure itself can cause referred pain to the ... Read More
Created for people with ongoing healthcare needs but benefits everyone.
A 24-year-old female asked:
Dr. Nikolaos Zacharias
Maternal-Fetal Medicine 27 years experience
IUD.: An intrauterine contraceptive device may be the best choice for someone in a mutually monogamous relationship that desires long-term, reliable reversi... Read More
Created for people with ongoing healthcare needs but benefits everyone.
A 39-year-old female asked:
Dr. Nikolaos Zacharias
Maternal-Fetal Medicine 27 years experience
Seek REI care!: Take Folic Acid 1-5 mg daily and seek the consultation of a reputable in vitro fertilization specialist in your area if you have been trying to get pr... Read More
Created for people with ongoing healthcare needs but benefits everyone.
A 28-year-old male asked:
Dr. Nikolaos Zacharias
Maternal-Fetal Medicine 27 years experience
2ary amenorrhea.: Secondary amenorrhea should be investigated by a gynecologist and/or a reproductive endocrinology specialist. It could be caused by a variety of reaso... Read More
Created for people with ongoing healthcare needs but benefits everyone.

Testimonials
Recommendations and Thank you notes are endorsements given from patients or other doctors.

24
Recommendations
2.4K
Thank you notes
Nov 4, 2012
Dr. Zacharias is extremely well-versed in his field and consistently provides informative, practical answers to a wide variety of HealthTap questions. I enjoy learning from him!
May 11, 2013
Exceptional source of information on Maternal - Fetal Medicine. Provides an excellent public service through Health Tap. I recommend Dr. Zacharias.
Aug 10, 2015
Dr. Zacharias gives superb & accurate advice. He is certainly very experienced and is very well versed in his specialty.
HealthTap member
Want to monitor polyps on cervix that appeared w intoduction of extra estrogen from pregnancy. Were not visible two weeks before pregnancy. Want to make sure they aren't growing wildly. Make sense? I'...Read More
HealthTap member
Thanks! Feel much better. My verify was negative for downs and based on what you said that is far more accurate and I can disregard the 1 in 20. I will also take sequinom but assume the same result wi...Read More
HealthTap member
thank you. my son had numerous chd's. he had a asd, missing dividing wall between chambers, and heterotaxia. this caused him to have malrotation of the intestines, and he had asplenia. due to not havi...Read More

Education & Training

Medical/Graduate school

National University of Athens Faculty of Medicine, Greece
Graduated 1995MD

Residency

Baylor College of Medicine

Awards

UTMB Hospital Academic Fellowship Award, 2002-2005.
CREOG/ACOG outstanding Academic Achievement Award, 1999-2002.
Papadakis Undergraduate Hellenic Award, 1989-1995.

Affiliations

Society for Maternal-Fetal Medicine
American College of Obstetricians and Gynecologists
Harris County Medical Society
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