In short
Act 172-2016 establishes Body Mass Index (BMI) measurement of minors as a childhood obesity prevention strategy, in two settings: during vaccination — qualified staff at Vaccination Centers and at pediatricians’ offices that administer vaccines calculate the BMI and include the information in the Immunization Certificate — and at school. At public educational institutions, at the start and end of the school semester, the physical education teacher, nursing staff or, failing that, the social worker or school principal takes each student’s weight and height from kindergarten through twelfth grade to determine the BMI Registry Code according to CDC tables; the first measurement must be taken before the first parents’ visit, before the first ten (10) weeks, and the second before Physical Activity Week, held on April 6 each year. The Department of Health develops and disseminates an Orientation Protocol that public and private institutions must implement, incorporating the CDC recommendations: involving parents, guardians, students and school staff and ensuring there is a procedure for obtaining consent; specialized and trained personnel; measurement in a private setting; calibrated instrumentation; and not using BMI data to evaluate physical education or school health teachers. Public and private institutions must send written notice to the parent or guardian if the Immunization Certificate indicates a BMI Registry Code establishing childhood obesity.
What is it?
It is the law that put minors’ BMI measurement inside the vaccination process and inside the school. For a parent, the useful part is not the programme but the safeguards: there is a consent procedure, measurement happens in a private setting, the datum is confidential, and if the result indicates childhood obesity they must summon you and hand you a letter explaining what it means.
Who can do it?
Children who go to Vaccination Centers and to pediatricians’ offices administering immunization vaccines; and, in the school setting, students from kindergarten through twelfth grade. The written notice duty reaches both public and private educational institutions.
Requirements
- That the minor be a student from kindergarten through twelfth grade, for the school measurement; or that they attend a Vaccination Center or pediatrician’s office administering vaccines, for measurement in that setting.Verified against the official source
Documents you need
Cost
Step by step
Step 1: There must be a consent procedure
The Orientation Protocol the Department of Health develops and that public and private institutions must implement incorporates the CDC recommendations, and the first is this: “Involve parents, guardians, students and school staff and ensure there is a procedure for obtaining consent for taking the measurements.” Asking about that procedure is asking about something the law requires to exist.
Step 2: The measurement happens in a private setting
It is among the recommendations the law adopts: “Ensure that measurements are taken in a private setting.” Also: ensure there is specialized personnel trained in taking measurements so the results are reliable, and use appropriate, calibrated instrumentation so weight and height measurements are reliable and valid.
Step 3: The datum is confidential and handed over by summoning you
The Department of Education shall adopt by regulation strict specific procedures and guidelines to ensure the confidentiality of the information regarding the BMI Registry Code. That regulation must require the staff custodian of that information to summon the parents in order to hand them the correspondence. And the Department shall require its staff to safeguard the information and shall prohibit its disclosure beyond what Education and Health specify.
Step 4: What the letter must say
Public and private institutions must ensure written notice is sent to the parent or guardian if, upon receiving the Immunization Certificate, it indicates the child has a BMI Registry Code establishing childhood obesity. The letter must explain what the Body Mass Index is and the possible medical implications this may signify, and must suggest a pediatric visit to explore treatments and rule out associated conditions. The responsible staff are the physical education teacher, nursing staff or, failing that, the school social worker or principal.
Step 5: When it is measured at school
At public educational institutions, at the start and end of the school semester, from kindergarten through twelfth grade. The law sets both moments: the first measurement must be taken before the first visit of parents or guardians, before the first ten (10) weeks, so they can be informed and educated directly about their child’s status; the second must be before Physical Activity Week, held on April 6 of each calendar year.
Step 6: The datum may not be used to evaluate teachers
It is expressly among the recommendations the law adopts: “Do not use BMI data to evaluate the performance of physical education or school health teachers.” It is a safeguard that also protects the quality of the data.
Step 7: If you do not vaccinate the minor, the pediatrician does the calculation
It is the rule almost nobody knows. If the parent or custodian, under Article 5 of Act No. 25 of September 23, 1983 — which allows filing a sworn statement indicating that for religious or clinical reasons they do not wish to immunize the minor — does not take the minors in their care to be vaccinated, it becomes the responsibility of the pediatrician attending them to calculate the Body Mass Index and give them a certification with the specifications the law provides.
Where to do it
The Department of Health develops the Orientation Protocol and the instructional module to train staff; the Department of Education adopts the confidentiality regulation and includes results in the Student Information System. If the school fails on consent, privacy or confidentiality, the claim goes to the Department of Education; the complaint route is in our school guides. If your matter is the vaccine exemption itself, that is the school vaccines guide.
How long it takes
What to do if something goes wrong
What this law does not carry and what we did not read. It sets no penalty for non-compliance: there is no fine or sanction in its text, and we will not invent one. On consent it is worth being exact: the law orders the protocol to ensure “there is a procedure for obtaining consent for taking the measurements,” and that is what we quote; the law’s text does not say what happens if a parent refuses, and we will not resolve that for it — that answer lives in the Department of Education regulation, which we did not read. Nor did we read Act No. 25 of September 23, 1983 beyond this law’s references, or the CDC article “Body Mass Index Measurement in Schools” the law adopts by reference, or the CDC tables. So we publish no BMI thresholds, percentiles or clinical interpretation: that is what the pediatrician is for, which is precisely where the law directs the referral. And note a clause in the text itself: if the CDC recommendations are amended, or if they conflict with any law, federal regulation or administrative directive applicable to Puerto Rico, they shall be understood as amended to harmonize with them.
Common mistakes
- Not asking about the consent procedure: the law requires the protocol to ensure one exists.
- Accepting that the minor be measured in front of the class: the law requires a private setting.
- Accepting that the datum circulate: Education must prohibit disclosure beyond what is specified.
- Receiving the letter without the explanation: it must say what BMI is and the possible medical implications.
- Believing it applies only to public schools: the written notice duty also reaches private ones.
- Looking for a fine in this law: it sets none.
Frequently asked questions
Can I refuse to have my child measured?
The law orders the protocol to involve parents and guardians and “ensure there is a procedure for obtaining consent for taking the measurements.” What happens if consent is refused is not resolved in the law’s text, but in the Department of Education regulation, which we did not read.
Where is the measurement taken?
In a private setting. It is one of the CDC recommendations the law expressly adopts, along with the requirement of specialized, trained personnel and calibrated instrumentation.
Who can see the result?
The Department of Education must adopt by regulation strict procedures and guidelines to ensure the confidentiality of the BMI Registry Code, require its staff to safeguard it and prohibit disclosure beyond what Education and Health specify, and require the custodian staff to summon parents to hand them the correspondence.
When is it measured during the school year?
At the start and end of the school semester. The first measurement must be taken before the first parents’ visit, before the first ten (10) weeks; the second, before Physical Activity Week, held on April 6 of each calendar year.
Official sources
These are the government pages this guide is based on.
- Departamento de Educación de Puerto Rico
Educación
bvirtualogp.pr.gov
- Department of Education
Departamento de Educación
www.de.pr.gov
Last verified
August 24, 2026
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