The SAB medical abbreviation most often stands for spontaneous abortion, which is the clinical term for a miscarriage, a pregnancy that ends on its own before the baby could survive outside the womb. In medical language, abortion simply means a pregnancy ended before 20 weeks, and spontaneous means it was not caused by any procedure or medicine.
Many people first see SAB in their own records after a loss, sometimes in a later pregnancy when the history is reviewed again, and the word can feel cold or upsetting. It is not meant that way. The wording is used for its precision, and many now write miscarriage or early pregnancy loss in patient facing notes. This page explains what SAB means, how it is recorded, and two other meanings found in anesthesia and infection notes.
At a glance
Stands for
Spontaneous abortion, the medical term for miscarriageOther meanings
Subarachnoid block (spinal anesthesia); Staphylococcus aureus bacteremiaPlain wording
Miscarriage or early pregnancy lossUsed in
Obstetric history, gynecology notes, early pregnancy clinicsWritten as
SAB, often with a count, as in SAB x2Do not confuse with
TAB or EAB, which describe a pregnancy ended by procedure or medicine
What the SAB medical abbreviation means in pregnancy
A spontaneous abortion is the loss of a pregnancy before 20 weeks, most often in the first trimester. It is very common: roughly 10 to 20 out of every 100 known pregnancies end this way, and the true number is higher because some losses happen before a person knows they are pregnant.
The most frequent cause is a random problem with the chromosomes of the developing pregnancy, which nobody could have prevented. Everyday activities such as working, exercising, lifting a child, having sex, or a mild stumble do not cause miscarriage. People often blame themselves after a loss, so clinicians try to say this clearly. SAB in a chart is a neutral record of what happened, not a judgment.
How SAB appears in an obstetric history
Pregnancy history is often written in a compact code. One common system, called GTPAL, lists total pregnancies, term births, preterm births, abortions and living children. In that system the A column counts both spontaneous and induced losses before 20 weeks.
| Code | Plain reading |
|---|---|
| G3 | Three pregnancies in total, including any current one |
| P1011 | One term birth, no preterm births, one loss before 20 weeks, one living child |
| SAB x1 at 8 weeks | The loss was one miscarriage at about eight weeks |
At a first prenatal visit: a nurse reviewing a new chart reads "G2P0010, SAB x1, here for dating ultrasound." This person had one earlier miscarriage and is pregnant again. The note helps the team plan early care and offer support.
Words clinicians use for different kinds of loss
Notes sometimes add a word that describes what was found on exam or ultrasound. These are clinical descriptions, and the care plan depends on which applies.
| Term | General meaning |
|---|---|
| Threatened | Bleeding or cramping in early pregnancy, with the pregnancy still continuing |
| Inevitable | The cervix has opened and the loss is expected to happen |
| Incomplete | Part of the pregnancy tissue is still inside the uterus |
| Complete | All tissue has passed and the uterus is empty |
| Missed | The pregnancy stopped developing but has not yet passed |
A threatened miscarriage does not always lead to a loss. Many pregnancies with early bleeding go on normally.
Other meanings of SAB outside pregnancy
Context settles which meaning is intended. In an anesthesia record, SAB means subarachnoid block, another name for a spinal anesthetic in which numbing medicine is placed into the fluid around the lower spinal cord, often for a cesarean birth or hip and knee surgery. In infectious disease and hospital medicine notes, SAB can mean Staphylococcus aureus bacteremia, a bloodstream infection with that germ.
So "Plan: SAB" on an anesthesia form and "SAB on hospital day 2" on an infection consult mean entirely different things from an obstetric history line. When a line is ambiguous, its author can clarify it.
If you are reading this about your own loss
Finding this term in your file can bring back hard feelings. It is normal to have questions about why it happened, whether tests are needed, or what it means for a future pregnancy. One miscarriage does not usually change the chances of a healthy pregnancy later, and clinicians often suggest further testing only after repeated losses. Grief after miscarriage is real, and support is available through your care team and counseling services.
This page explains medical wording in general. Your obstetric or gynecology clinician can talk through what happened in your situation, answer questions about the future, and point you to support if you would like it.
Frequently asked questions
What does SAB mean on my pregnancy chart?
On a pregnancy chart SAB means spontaneous abortion, the medical term for a miscarriage. It refers to a pregnancy that ended on its own before 20 weeks.
Why do doctors call a miscarriage an abortion?
In medical language, abortion means any pregnancy that ends before 20 weeks, whatever the cause. Spontaneous makes clear that it happened naturally. Many clinicians now prefer miscarriage or early pregnancy loss when speaking with patients.
What is the difference between SAB and TAB?
SAB is a spontaneous loss, or miscarriage. TAB means therapeutic abortion, a pregnancy ended on purpose with medicine or a procedure. Both may be counted in the A column of a GTPAL history.
Can SAB mean something other than miscarriage?
Yes. In anesthesia notes it means subarachnoid block, a type of spinal anesthetic. In infection notes it can mean a bloodstream infection with Staphylococcus aureus. The setting of the note shows which meaning applies.
Did something I did cause the SAB?
Most miscarriages happen because of chromosome problems that no one could prevent, and normal daily activity does not cause them. Your clinician can talk through your own history if you have concerns.