What BMI do you need to be a surrogate?
You need a BMI under 33 to become a surrogate with Private Label Surrogacy. That means 32.9 or lower. A BMI of exactly 33 does not qualify.
The limit is the same for every candidate, in every state. It is one of the core surrogate requirements, alongside age 21 to 43, at least one healthy full-term pregnancy, and currently parenting a child. Unlike most of those, BMI is something that can change. That is why PLS treats it as a timing question, not a permanent no.
How do you calculate your BMI?
BMI, or body mass index, is your weight in kilograms divided by your height in meters squared. In pounds and inches, the formula is your weight in pounds, times 703, divided by your height in inches squared.
An example: you are 5 feet 5 inches (65 inches) and weigh 185 pounds. 185 times 703 is 130,055. 65 squared is 4,225. 130,055 divided by 4,225 is 30.8. That is under 33, so you meet the requirement.
The table below shows, for each height, the weight at which BMI reaches 30 and the weight at which it reaches 33. To qualify, you need to weigh less than the figure in the last column. Figures are calculated from the standard formula and rounded to the nearest pound.
| Height | BMI 30 is reached at | BMI 33 is reached at |
|---|---|---|
| 4'11" | 149 lb | 163 lb |
| 5'0" | 154 lb | 169 lb |
| 5'1" | 159 lb | 175 lb |
| 5'2" | 164 lb | 180 lb |
| 5'3" | 169 lb | 186 lb |
| 5'4" | 175 lb | 192 lb |
| 5'5" | 180 lb | 198 lb |
| 5'6" | 186 lb | 205 lb |
| 5'7" | 192 lb | 211 lb |
| 5'8" | 197 lb | 217 lb |
| 5'9" | 203 lb | 224 lb |
| 5'10" | 209 lb | 230 lb |
| 5'11" | 215 lb | 237 lb |
| 6'0" | 221 lb | 243 lb |
On the prescreen you report your own height and weight. Later, the fertility clinic measures both at your medical screening, and that measurement is the one that counts. If you are close to the line, weigh yourself on a reliable scale before you apply.
Why do clinics set a BMI limit?
Fertility clinics, not agencies, decide whether to transfer an embryo to a gestational carrier. Most PLS partner clinics will not transfer to a carrier with a BMI of 33 or higher. PLS sets its limit where the clinics set theirs, so you do not complete months of screening only to be declined at the clinic.
The clinics' reason is your health. Above that line, the CDC and ACOG document higher rates of:
- Gestational diabetes.
- Preeclampsia and other high blood pressure conditions in pregnancy.
- Delivery by C-section.
- Complications with anesthesia, including epidurals and the anesthesia used for a C-section.
These are risks to you, not only to the pregnancy. A surrogate pregnancy should be one you can carry safely and recover from fully, back to your own family.
What happens if your BMI is 30 to 32?
A BMI from 30 to 32.9 is accepted at PLS. You go through the same screening as every other candidate. Some partner clinics ask for additional labs for candidates in this range before they clear a transfer. If your matched clinic does, your case manager coordinates the appointment with you.
Mark Silverberg, DDS, MD, reads every candidate's prenatal and delivery records. In this range he looks closely at blood pressure and glucose results from your past pregnancies, since those tell the clinic more than the BMI number alone.
Can you reapply after losing weight?
Yes. A BMI of 33 or higher is a temporary disqualifier at PLS. If your BMI drops below 33 and holds there for three months, you can reapply. The hold period exists because a stable weight is a better sign of how your body will handle pregnancy than a number reached in the last few weeks.
If you are working toward the threshold, do it with your own doctor, at a pace that is safe for you. A crash diet before screening helps no one. When you reapply, you start with the same five-minute prescreen.
Does BMI change during the journey matter?
Before transfer, yes. The clinic measures you at medical screening, and the medical cycle that follows takes two to three months. If your weight rises above the threshold in that window, tell your case manager. The clinic decides whether the transfer goes ahead.
Once you are pregnant, the BMI limit no longer applies. Weight gain is an expected part of pregnancy, and your OB monitors it like any other. What PLS adds is support. Julie Bendix, MPH, RD, LD, CLC, is a registered dietitian and lactation counselor who meets with every PLS surrogate at least six times across the journey. Her consults cover eating well through pregnancy, managing blood sugar if that becomes a concern, and recovery afterward. See the nutrition program.
If your BMI is under 33 and the rest of the requirements fit, start the prescreen at See if I qualify. If BMI is one of several questions in your history, read what disqualifies a surrogate first.
Sources
- CDC (Centers for Disease Control and Prevention), adult BMI calculation and categories. cdc.gov
- ACOG (American College of Obstetricians and Gynecologists), guidance on obesity in pregnancy. acog.org
- ASRM (American Society for Reproductive Medicine), recommendations for practices using gestational carriers. asrm.org