Gpal formula in obs with exampls
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GPAL formula obstetric history examples gravida para
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Here is a complete guide to the GPAL formula in obstetrics:
What is GPAL?
GPAL is a shorthand notation used to record a woman's complete obstetric (pregnancy) history. Each letter stands for:
| Letter | Stands For | Meaning |
|---|---|---|
| G | Gravida | Total number of pregnancies (including the current one), regardless of outcome |
| P | Para | Number of pregnancies delivered at or after 20 weeks (regardless of whether the baby was alive or stillborn) |
| A | Abortus | Number of pregnancies lost before 20 weeks - includes miscarriages (spontaneous abortions) AND elective/induced abortions |
| L | Living children | Number of children currently alive |
Note: Some centers use GTPAL which adds T (Term deliveries, ≥37 weeks) and P (Preterm deliveries, 20-36+6 weeks) for more detail.
Key Rules to Remember
- G (Gravida) counts ALL pregnancies - current + past, regardless of outcome.
- P (Para) counts deliveries ≥20 weeks - a twin delivery counts as ONE para, not two.
- A (Abortus) counts ALL pregnancy losses <20 weeks - spontaneous AND induced.
- L (Living) counts children alive RIGHT NOW - stillborns are NOT counted.
- If a woman is currently pregnant, she is already counted in G.
Examples
Example 1 - Simple case
A woman is currently pregnant for the first time, with no prior history.
- G = 1 (current pregnancy)
- P = 0 (no deliveries yet)
- A = 0
- L = 0
- GPAL: G1 P0 A0 L0 (also written as Primigravida)
Example 2 - Previous normal delivery
A woman had one previous normal delivery at 38 weeks (baby alive), and is now pregnant again.
- G = 2 (previous + current)
- P = 1 (one delivery ≥20 weeks)
- A = 0
- L = 1 (one living child)
- GPAL: G2 P1 A0 L1
Example 3 - With a miscarriage
A woman had one miscarriage at 10 weeks, one normal delivery at 39 weeks, and is now pregnant.
- G = 3 (miscarriage + normal delivery + current pregnancy)
- P = 1 (only the 39-week delivery counts)
- A = 1 (the miscarriage at 10 weeks)
- L = 1 (one living child)
- GPAL: G3 P1 A1 L1
Example 4 - Multiple losses
A woman has had two induced abortions, one spontaneous miscarriage at 8 weeks, and two normal deliveries (both children alive).
- G = 5 (2 abortions + 1 miscarriage + 2 deliveries)
- P = 2 (two deliveries ≥20 weeks)
- A = 3 (2 induced + 1 spontaneous)
- L = 2 (both children alive)
- GPAL: G5 P2 A3 L2
Example 5 - Twin delivery
A woman delivered twins at 36 weeks (both alive), then had a miscarriage at 12 weeks, and is now pregnant again.
- G = 3 (twin delivery + miscarriage + current)
- P = 1 (twin delivery = ONE para event, even though two babies)
- A = 1 (miscarriage at 12 weeks)
- L = 2 (both twins alive)
- GPAL: G3 P1 A1 L2
Example 6 - Stillbirth
A woman had one normal delivery at 38 weeks (stillborn), then one normal delivery at 40 weeks (alive), and is now pregnant.
- G = 3
- P = 2 (both deliveries ≥20 weeks, even though one was a stillbirth)
- A = 0
- L = 1 (only the living child counts)
- GPAL: G3 P2 A0 L1
Common Tricky Points
| Scenario | Rule |
|---|---|
| Ectopic pregnancy | Counts in G and A (terminated before 20 weeks) |
| Molar pregnancy | Counts in G and A |
| Twin/triplet delivery | Counts as ONE in P (one delivery event) |
| Stillbirth at 28 weeks | Counts in P (≥20 weeks), but NOT in L |
| Current pregnancy | Always counted in G |
Quick Memory Aid
"G counts all you started, P counts all you delivered (≥20 wks), A counts all you lost (before 20 wks), L counts who is alive today."
Why GPAL Matters Clinically
- Identifies high-risk pregnancies (grand multipara = P≥5, increased risk of hemorrhage, uterine rupture)
- Flags recurrent pregnancy loss (high A number)
- Helps assess birth canal readiness (primipara vs. multipara)
- Guides antenatal risk stratification
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