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Gravidity and Parity

NCLEX Review Guide: Gravidity and Parity

Understanding Gravidity and Parity

Basic Definitions

  • Gravidity (G) refers to the total number of pregnancies a woman has had, regardless of outcome. This includes current pregnancy, live births, stillbirths, miscarriages, and therapeutic abortions.
  • Parity (P) refers to the number of pregnancies that have reached viability (20 weeks gestation or fetal weight ≥500g), regardless of whether the infant was born alive or stillborn.
  • Key Point: A woman pregnant for the first time is called a primigravida, while a woman who has given birth once is called a primipara.

Memory Aid: GTPAL System

G = Gravidity (total pregnancies)
T = Term births (≥37 weeks)
P = Preterm births (20-36 weeks)
A = Abortions (spontaneous/therapeutic <20 weeks)
L = Living children

Key Points

  • Gravidity increases with each pregnancy, including the current one
  • Parity only increases when pregnancy reaches viability (≥20 weeks)
  • Multiple births (twins, triplets) count as ONE pregnancy for gravidity and ONE birth for parity

Clinical Application

Clinical Example

Patient History: Mrs. Johnson is currently pregnant. She has had: - 2 full-term deliveries - 1 miscarriage at 12 weeks - 1 stillbirth at 24 weeks - 3 living children

GTPAL Classification: G5 T2 P1 A1 L3

  1. Count all pregnancies (including current) for Gravidity
  2. Count births ≥37 weeks for Term
  3. Count births 20-36 weeks for Preterm
  4. Count losses <20 weeks for Abortions
  5. Count currently living children

Commonly Confused Concepts

Scenario Gravidity Parity Rationale
Twin pregnancy delivered at term Counts as 1 Counts as 1 One pregnancy = one gravidity; one delivery = one parity
Miscarriage at 18 weeks Counts as 1 Does NOT count Was pregnant but didn't reach viability
Stillbirth at 28 weeks Counts as 1 Counts as 1 Reached viability regardless of outcome
Common Pitfall: Students often confuse parity with number of living children. Remember: parity counts pregnancies that reached viability, not living children!

Study Tips and Memory Aids

Quick Memory Tricks

  • "G for Got pregnant" - counts every time she got pregnant
  • "P for Passed viability" - only counts if pregnancy passed 20 weeks
  • "20 weeks = viability line" - this is the magic number for parity

Practice Questions Approach

  • Always read the entire obstetric history carefully before answering
  • Look for key words: "miscarriage," "abortion," "stillbirth," "preterm," "full-term"
  • Count systematically using the GTPAL method
  • Remember that current pregnancy is included in gravidity count
Test-Taking Tip: When calculating GTPAL, draw a simple chart and fill in each category methodically. This prevents calculation errors under exam pressure.

Quick Knowledge Check

A woman is currently pregnant. She has delivered twins at 35 weeks, had a miscarriage at 10 weeks, and delivered a singleton at 39 weeks. Two children are living.

Answer: G4 T1 P1 A1 L2

I can correctly identify gravidity vs parity I understand the 20-week viability rule I can apply GTPAL system accurately

You're building the foundation for safe maternal-newborn care! Master these basics and you'll excel in obstetric nursing. Keep practicing - every nurse started exactly where you are now! 💪

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