Locations
IVF Institute, P.A.
Dallas, TX
My office hours
Thursday: 9:00am - 5:00pm
Show morePhone
Practice website
Insurances accepted
Aetna
Blue Cross Blue Shield of Texas
UnitedHealthcare
Cigna
IVF Institure, P.A.
Richardson, TX
About
Bio
Dr. Haas moved to Dallas, Texas in 2001 to begin a three-year fellowship in reproductive endocrinology and infertility at the University of Texas Southwestern. His area of research during fellowship focused on ovarian physiology with special emphasis on polycystic ovarian syndrome. Dr. Haas presented his research findings at national meetings and had his work published in scientific journals (Fertility & Sterility, Molecular Endocrinology).
Dr. Haas was in private practice for over 9 years in Irving, TX. He now practices in Richardson, TX and Dallas, TX. He believes that patients should play an active role in their medical care. He likes to create a non-stressful office environment so the patient enjoys their experience as much as possible. He specializes in all aspects of fertility treatment including ovulation induction, intrauterine insemination (IUI), surgery, and IVF.
SpecialtiesDoctors 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.
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.
Fertility Medicine
Licenses
United States: Texas
Languages spoken
English, Mandarin, Vietnamese
Doctor Q&A
246 Answers
41 Agrees
The number of answers this doctor has agreed with.
A 26-year-old female asked:
Dr. Derek Haasanswered
Specializes in Fertility Medicine
One mature follicle: If a woman is not taking any fertility meds, she will release only one mature follicle per month. This is the case 99% of the time. The 1% exception... Read More
Created for people with ongoing healthcare needs but benefits everyone.
1.1k viewsAnswered >2 years ago
A 22-year-old female asked:
Dr. Derek Haasanswered
Specializes in Fertility Medicine
Repeat preg test: Pregnancy test kits are not 100% accurate. You can try a different brand to definitively rule out pregnancy. Another possibility is that you ovulate... Read More
Created for people with ongoing healthcare needs but benefits everyone.
1.4k viewsAnswered >2 years ago
A 36-year-old female asked:
Dr. Derek Haasanswered
Specializes in Fertility Medicine
That can happen: This is usually caused by infrequent (not regular) ovulation. The longer you go between periods, the thicker the uterine lining builds. So when you ... Read More
Created for people with ongoing healthcare needs but benefits everyone.
1.1k viewsAnswered >2 years ago
A 35-year-old female asked:
Dr. Derek Haasanswered
Specializes in Fertility Medicine
Depends: It depends on when the tubal reversal surgery occurred. The first 1-2 months after a gynecological surgery your periods may be off. Your doctor may ... Read More
Created for people with ongoing healthcare needs but benefits everyone.
1.2k viewsAnswered >2 years ago
A 30-year-old female asked:
Dr. Derek Haasanswered
Specializes in Fertility Medicine
Not to worry: The birth control pill (BCP) will change the amount of bleeding that you have with your menses. The longer you are on it, the lighter and more predic... Read More
Created for people with ongoing healthcare needs but benefits everyone.
1.3k viewsAnswered >2 years ago
A 24-year-old female asked:
Dr. Derek Haasanswered
Specializes in Fertility Medicine
Probably not: Generally speaking, the only way to improve pelvic inflammatory disease (PID) is to be treated with antibiotics. I wonder if your PID was proven by c... Read More
Created for people with ongoing healthcare needs but benefits everyone.
1.3k viewsAnswered >2 years ago
A 49-year-old female asked:
Dr. Derek Haasanswered
Specializes in Fertility Medicine
See your doctor: You are having cramping pains but no bleeding? There are other organs in the pelvis that can cause the sensation of pain/cramps. Specifically, the c... Read More
Created for people with ongoing healthcare needs but benefits everyone.
1.1k viewsAnswered >2 years ago
A 24-year-old member asked:
Dr. Derek Haasanswered
Specializes in Fertility Medicine
PCOS: Your delayed period has nothing to do with the HSG test. It is caused by the PCOS. With PCOS your body has plenty of eggs but has a difficult time a... Read More
Created for people with ongoing healthcare needs but benefits everyone.
1.1k viewsAnswered >2 years ago
A 27-year-old female asked:
Dr. Derek Haasanswered
Specializes in Fertility Medicine
Wait a bit: It sounds like you're about to start your menses due to the cramping pain. How do you know you're not pregnant? You're not sexually active or you've... Read More
Created for people with ongoing healthcare needs but benefits everyone.
1.1k viewsAnswered >2 years ago
A 26-year-old female asked:
Dr. Derek Haasanswered
Specializes in Fertility Medicine
Not ovulating: Some women naturally have irregular periods. This is usually caused by infrequent (not regular) ovulation. The longer you go between periods, the thic... Read More
Created for people with ongoing healthcare needs but benefits everyone.
1.1k viewsAnswered >2 years ago
A 28-year-old female asked:
Dr. Derek Haasanswered
Specializes in Fertility Medicine
Progesterone: You could take progesterone (many different types) for 10 days each month to have a regular menses. Note: this is not a form of contraception. You c... Read More
Created for people with ongoing healthcare needs but benefits everyone.
1.1k viewsAnswered >2 years ago
A 28-year-old female asked:
Dr. Derek Haasanswered
Specializes in Fertility Medicine
Yes, safe: Cefuroxime belongs to the class of antibiotics called cephalosporins. They are safe during pregnancy (Category B). If you have any allergies to anti... Read More
Created for people with ongoing healthcare needs but benefits everyone.
1.1k viewsReviewed >2 years ago
A 32-year-old female asked:
Dr. Derek Haasanswered
Specializes in Fertility Medicine
Yes you can: Yes, you definitely ovulated so it's still possible to get pregnant. When you check a progesterone level it measures just a single point in time. If... Read More
Created for people with ongoing healthcare needs but benefits everyone.
1.1k viewsAnswered >2 years ago
A female asked:
Dr. Derek Haasanswered
Specializes in Fertility Medicine
Okay for now: I'm not worried about your period being lighter/shorter. Your AMH and follicle count are what matter when it comes to your egg reserve. AMH of 1.86 ... Read More
Created for people with ongoing healthcare needs but benefits everyone.
1.2k viewsReviewed >2 years ago
A 26-year-old female asked:
Dr. Derek Haasanswered
Specializes in Fertility Medicine
Normal : Yes, this is typically a sign that your progesterone levels are dropping and that your uterus is preparing to have a full flow period. It is unlikely ... Read More
Created for people with ongoing healthcare needs but benefits everyone.
1.1k viewsReviewed >2 years ago
A 23-year-old female asked:
Dr. Derek Haasanswered
Specializes in Fertility Medicine
Many possibilities: If the D&C was routine and without any complications (like an infection or a perforation of uterus during the surgery) then it should have no effe... Read More
Created for people with ongoing healthcare needs but benefits everyone.
1.2k viewsAnswered >2 years ago
A 23-year-old female asked:
Dr. Derek Haasanswered
Specializes in Fertility Medicine
Not likely: If you were outside then you had good ventilation so you should be fine. In addition, the duration of time (30 minutes) wasn't very long. The baby's... Read More
Created for people with ongoing healthcare needs but benefits everyone.
1.3k viewsAnswered >2 years ago
A 20-year-old female asked:
Dr. Derek Haasanswered
Specializes in Fertility Medicine
Yes normal: Yes this is normal. Like all combination hormonal contraceptives (progesterone + estrogen), there will be changes to your menses. They have higher pr... Read More
Created for people with ongoing healthcare needs but benefits everyone.
1k viewsReviewed >2 years ago
A member asked:
Dr. Derek Haasanswered
Specializes in Fertility Medicine
Protected?: If you started your full flow menses on July 2nd and had intercourse on July 10 then it is possible that you could have conceived. With protected inte... Read More
Created for people with ongoing healthcare needs but benefits everyone.
1k viewsAnswered >2 years ago
A 18-year-old female asked:
Dr. Derek Haasanswered
Specializes in Fertility Medicine
Very low chance: It is still possible to get pregnant without ejaculation because there are some sperm present in the lubricating fluid ("pre-cum") that precedes male ... Read More
Created for people with ongoing healthcare needs but benefits everyone.
1.1k viewsAnswered >2 years ago
A 28-year-old female asked:
Dr. Derek Haasanswered
Specializes in Fertility Medicine
Missing your period: Missing your period at the expected time is the first "symptom" for most women. Other signs would be a change in appetite, maybe some mild nausea, an... Read More
Created for people with ongoing healthcare needs but benefits everyone.
1.1k viewsAnswered >2 years ago
A 25-year-old female asked:
Dr. Derek Haasanswered
Specializes in Fertility Medicine
Any liquid: It makes no difference the type of liquid you use to swallow your BCP. What's important is that you take it every day and you try to take it around t... Read More
Created for people with ongoing healthcare needs but benefits everyone.
1.1k viewsAnswered >2 years ago
A 36-year-old female asked:
Dr. Derek Haasanswered
Specializes in Fertility Medicine
Normal: Your menstrual cycle pattern can change over the course of your reproductive years. As long as you have full flow bleeding at some point each month t... Read More
Created for people with ongoing healthcare needs but benefits everyone.
1.1k viewsReviewed >2 years ago
A 20-year-old female asked:
Dr. Derek Haasanswered
Specializes in Fertility Medicine
Not ovulating: It sounds like you have anovulation or difficulty ovulating. One common form of anovulation is PCOS....polycystic ovary syndrome. There are other co... Read More
Created for people with ongoing healthcare needs but benefits everyone.
1.3k viewsReviewed >2 years ago
A 26-year-old female asked:
Dr. Derek Haasanswered
Specializes in Fertility Medicine
Irritation: There can be some irritation of the uterus after an IUI. It depends somewhat on how the semen was processed. Very unlikely to be an infection. You ... Read More
Created for people with ongoing healthcare needs but benefits everyone.
1.3k viewsAnswered >2 years ago
A 22-year-old female asked:
Dr. Derek Haasanswered
Specializes in Fertility Medicine
Drop in estrogen: After the LH surge (hormonal trigger for ovulation) there is a natural decrease in the estrogen level. This can slightly destabilize the uterine lini... Read More
Created for people with ongoing healthcare needs but benefits everyone.
1.4k viewsAnswered >2 years ago
A 28-year-old female asked:
Dr. Derek Haasanswered
Specializes in Fertility Medicine
Probably not preg: If you take your BCPs every day then there is a very low chance of pregnancy, but it's not a zero % chance. If you're really concerned, then just che... Read More
Created for people with ongoing healthcare needs but benefits everyone.
1.1k viewsAnswered >2 years ago
A 25-year-old female asked:
Dr. Derek Haasanswered
Specializes in Fertility Medicine
Possible cyst: If you're trying to conceive, then you should have taken the Clomid (clomiphene) for 5 days. Judging by your symptoms, you may have ovulated from the... Read More
Created for people with ongoing healthcare needs but benefits everyone.
1.2k viewsAnswered >2 years ago
A 21-year-old female asked:
Dr. Derek Haasanswered
Specializes in Fertility Medicine
Take regular BCPs: You have exposed yourself to high and sporadic doses of progesterone. You might be exhausted due to anemia. Your period will be off for while due to... Read More
Created for people with ongoing healthcare needs but benefits everyone.
1.2k viewsAnswered >2 years ago
A 19-year-old male asked:
Dr. Derek Haasanswered
Specializes in Fertility Medicine
Not pregnant: No. The only way to conceive is by penis to vagina penetration. Even if you had true intercourse but did not ejaculate (pre-cum only) there would be... Read More
Created for people with ongoing healthcare needs but benefits everyone.
1.1k viewsAnswered >2 years ago
A 22-year-old female asked:
Dr. Derek Haasanswered
Specializes in Fertility Medicine
Possible PCOS: The ovulation predictor kits don't work for every woman. PCOS patients usually have irregular cycles. Also they can have persistently elevated LH le... Read More
Created for people with ongoing healthcare needs but benefits everyone.
1.1k viewsAnswered >2 years ago
A 42-year-old female asked:
Dr. Derek Haasanswered
Specializes in Fertility Medicine
Many reasons: There are many reasons why you can have an irregular period. You've already ruled out pregnancy. The common thread is usually a failure to ovulate. ... Read More
Created for people with ongoing healthcare needs but benefits everyone.
1.2k viewsAnswered >2 years ago
A 30-year-old female asked:
Dr. Derek Haasanswered
Specializes in Fertility Medicine
Not really : Vitamin B6 is not an ovulation induction agent. There are specific medications such as Clomid for that purpose. The B vitamins as a family are impor... Read More
Created for people with ongoing healthcare needs but benefits everyone.
1.2k viewsAnswered >2 years ago
A 21-year-old female asked:
Dr. Derek Haasanswered
Specializes in Fertility Medicine
Concerning: Chlamydia is a very common cause of infertility, specifically due to tubal damage and pelvic scar tissue. Your partner needs to be treated as well. ... Read More
Created for people with ongoing healthcare needs but benefits everyone.
1.3k viewsReviewed >2 years ago
A female asked:
Dr. Derek Haasanswered
Specializes in Fertility Medicine
Not likely: Implantation typically happens about 6 days after ovulation occurs so 12 days is a stretch. How certain are you that the IUI occurred at the correct ... Read More
Created for people with ongoing healthcare needs but benefits everyone.
1.1k viewsAnswered >2 years ago
A 36-year-old female asked:
Dr. Derek Haasanswered
Specializes in Fertility Medicine
Probably: Since your P4 level is above 3 then that indicates that you have ovulated. You would need to measure another value to know if it's going up (a sign o... Read More
Created for people with ongoing healthcare needs but benefits everyone.
1k viewsReviewed >2 years ago
A 27-year-old female asked:
Dr. Derek Haasanswered
Specializes in Fertility Medicine
Veggies+fruits: There is no specific diet you should follow. A diet high in vegetables and fruits is a good start. Also, it's important to have sources of good qual... Read More
Created for people with ongoing healthcare needs but benefits everyone.
1.3k viewsReviewed >2 years ago
A 33-year-old female asked:
Dr. Derek Haasanswered
Specializes in Fertility Medicine
Depends: Have they checked your Hemoglobin or Hematocrit levels? After a D&C for miscarriage it's possible to have anemia (low hemoglobin levels in blood)... Read More
Created for people with ongoing healthcare needs but benefits everyone.
1.1k viewsAnswered >2 years ago
A member asked:
Dr. Derek Haasanswered
Specializes in Fertility Medicine
Irrregular cycles?: Hard to answer because I don't know your menstrual pattern. Do you consistently have 28-30 day cycles? Cycle day 28 is very late to get a peak reading... Read More
Created for people with ongoing healthcare needs but benefits everyone.
1.1k viewsAnswered >2 years ago
A 19-year-old female asked:
Dr. Derek Haasanswered
Specializes in Fertility Medicine
Getting worse?: If the pain is getting severe then you will need to be seen sooner. My first concern is pregnancy, especially a tubal pregnancy or a miscarriage. An... Read More
Created for people with ongoing healthcare needs but benefits everyone.
1.2k viewsAnswered >2 years ago
A 20-year-old female asked:
Dr. Derek Haasanswered
Specializes in Fertility Medicine
Expected: The "morning after" pill or plan B contains a high amount of progesterone. It makes your uterine lining incompatible with a potential embryo (tempora... Read More
Created for people with ongoing healthcare needs but benefits everyone.
1.2k viewsAnswered >2 years ago
A 29-year-old male asked:
Dr. Derek Haasanswered
Specializes in Fertility Medicine
Need semen analysis: Some men taking Propecia (finasteride) will notice a change in their semen quality. There is not a strong association with male infertility however. ... Read More
Created for people with ongoing healthcare needs but benefits everyone.
1.1k viewsAnswered >2 years ago
A 29-year-old female asked:
Dr. Derek Haasanswered
Specializes in Fertility Medicine
Hard to tell: The amount of progesterone that your body absorbs from the Mirena (levonorgestrel) is very small. Therefore you could have ovulated around the time t... Read More
Created for people with ongoing healthcare needs but benefits everyone.
1.2k viewsAnswered >2 years ago
A 24-year-old female asked:
Dr. Derek Haasanswered
Specializes in Fertility Medicine
The following day: If you were checking yourself every day and you first detected the surge on CD21 then the following day (CD22) is when the egg is released (or ovulate... Read More
Created for people with ongoing healthcare needs but benefits everyone.
1.2k viewsAnswered >2 years ago
A member asked:
Dr. Derek Haasanswered
Specializes in Fertility Medicine
2 possibilities: There are two possibilities: 1. It took you a lot longer to grow your dominant follicle this month. There are lots of things (stress) that can cause t... Read More
Created for people with ongoing healthcare needs but benefits everyone.
1.1k viewsAnswered >2 years ago
A 21-year-old female asked:
Dr. Derek Haasanswered
Specializes in Fertility Medicine
Depends on location: Sperm that stay in the vagina will die off rather quickly (within hours) because the vagina is an acidic environment. Sperm that manage to make it pa... Read More
Created for people with ongoing healthcare needs but benefits everyone.
1.1k viewsReviewed >2 years ago
A 24-year-old female asked:
Dr. Derek Haasanswered
Specializes in Fertility Medicine
Maybe: Do you mean you have polycystic ovaries(PCOS)? Typically those cysts are multiple but small. Or do you mean multiple large cysts? PCOS is associated ... Read More
Created for people with ongoing healthcare needs but benefits everyone.
1.1k viewsAnswered >2 years ago
A female asked:
Dr. Derek Haasanswered
Specializes in Fertility Medicine
Not enough: You probably did not expose your uterine lining to enough days of progesterone to induce your period. 5 days would be considered a minimum exposure a... Read More
Created for people with ongoing healthcare needs but benefits everyone.
1.1k viewsAnswered >2 years ago
A 34-year-old female asked:
Dr. Derek Haasanswered
Specializes in Fertility Medicine
Huge range: There is a huge range here for possibilities. Day 7 for a regularly ovulating woman with no other pathology--range 5-9mm. However, if you had someth... Read More
Created for people with ongoing healthcare needs but benefits everyone.
1k viewsReviewed >2 years ago
A member asked:
Dr. Derek Haasanswered
Specializes in Fertility Medicine
Depends....: This really depends on the number of days of bleeding that you have. For a woman with 28-30 day cycles she is most fertile on cycle day (CD)11-18. If ... Read More
Created for people with ongoing healthcare needs but benefits everyone.
1.1k viewsAnswered >2 years ago
TestimonialsRecommendations and Thank you notes are endorsements given from patients or other doctors.
Recommendations and Thank you notes are endorsements given from patients or other doctors.
2
Recommendations
159
Thank you notes
Jun 7, 2016
An excellent fertility specialist. He provides excellent care to my patients. I highly recommend
HealthTap member
Nov 27, 2015
This Thanksgiving, I wanted to share my appreciation for all that you do! Thank you, doctor! :)
HealthTap member
This was very helpful. Thanks! thank you sir. i am 21. i consulted a dermatologist for facial hairs, had laser treatment. in my third procedure recently he adviced me to get ultrasound done for pcos. ...Read More
HealthTap member
This was very helpful. Thanks! Dr. Haas, thank you for your quick response. It's an incredible service you provide, medical guidance to women like me who have questions and are struggling to find ans...Read More
HealthTap member
No prior to clomid my temperature was consistent & never remained below cover line. I do ovulate on my own just not as frequent. Either clomid or prometrium messing up my temps and hormones!
Education & Training
Medical/Graduate school
Indiana University School of Medicine, IN
MD
Residency
University of Tennessee at Memphis
Completed 2001
Awards
Super Doctor, Texas Montly Super Doctors
Top Reproductive Endocrinologist, First Place, National - Spring
2016
Top Doctor, Third Place, Dallas Region - Spring
2016
Affiliations
American Society Of Reproductive Medicine
American Board Of Obstetrics And Gynecology
American College Of Obstetricians And Gynecologists
Publications
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